- What's New
- Function Overview
- Product Bulletin
- Service Overview
- Billing
- Getting Started
-
User Guide
- Permissions Management
- Buying a GaussDB Instance
- GaussDB Instance Connection
-
Database Migration
- Overview of GaussDB Migration Solutions
- Using DRS to Migrate Data from Oracle Database to GaussDB
- Using DRS to Migrate Data from MySQL Database to GaussDB
- Migrating Data to GaussDB Using the Export and Import Functions of DAS
- Using the copy to/from Command to Export and Import Data
- Using CopyManager in JDBC to Export and Import Data
- Using gs_dump and gs_dumpall to Export Data
- Using gs_restore to Import Data
- Using gs_loader to Import Data
- Database Use
-
Instance Management
- Viewing GaussDB Instance Overview Data
- Configuring Security Group Rules for a GaussDB Instance
- Binding and Unbinding an EIP for a GaussDB Instance
- Modifying the Recycle Bin Policy for a GaussDB Instance
- Exporting Information About All GaussDB Instances
- Unsubscribing a Yearly/Monthly GaussDB Instance
- Stopping a GaussDB Instance
- Starting a GaussDB Instance
- Rebooting a GaussDB Instance
- Deleting a Pay-per-Use GaussDB Instance
- Rebuilding a GaussDB Instance
- Stopping a GaussDB Node
- Starting a GaussDB Node
- Rebooting a GaussDB Node
-
Instance Modifications
- Changing the Name of a GaussDB Instance
- Changing the Database Port of a GaussDB Instance
- Changing the M Compatibility Port
- Changing the CPU and Memory Specifications of a GaussDB Instance
- Configuring Read Replicas
- Synchronizing Data to a Single-Replica Instance
- Viewing and Modifying Advanced Features
- Scaling In and Out an Instance
- Scaling Up Storage Space
- Changing the Deployment Model
- Performing a Primary/Standby DN Switchover
- Instance Upgrade
- Plug-in Management
- Data Backup
- Data Restoration
- Parameter Management
- Monitoring and Alarming
- Logs and Auditing
- Quota Adjustment
- SQL Diagnosis
-
Disaster Recovery Management
- Constraints
- Creating a DR Task
- Checking DR Task Statuses
- Promoting the DR Instance to Primary
- Stopping a DR Task
- Deleting a DR Task
- Re-creating a DR Task After the Primary Instance Is Faulty
- Switching Roles of Primary and DR Instances
- Re-establishing a DR Relationship
- Performing a DR Drill
- Enabling or Disabling Log Cache
- Restrictions on the DR Instance
- Managing GaussDB Tasks
- Managing GaussDB Tags
- Resetting the Administrator Password of a GaussDB Instance
-
Developer Guide
-
Developer Guide(Distributed_8.x)
- Database System Overview
- Database Security
- Database Quick Start
- Development and Design Proposal
-
Application Development Guide
- Development Specifications
- Obtaining the Driver Package
-
Development Based on JDBC
- JDBC Packages, Driver Classes, and Environment Classes
- Development Process
- Loading a Driver
- Connecting to a Database
- Connecting to a Database (Using SSL)
- Connecting to a Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Database Connection
- Log Management
- Examples: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Logic Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
-
JDBC Interface Reference
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- PGReplicationConnection
- PGReplicationStream
- ChainedStreamBuilder
- ChainedCommonStreamBuilder
- Common JDBC Parameters
- FAQs
- JDBC Data Type Mapping
- Development Based on ODBC
- Development Based on libpq
- Psycopg-based Development
-
ECPG-based Development
- Development Process
- ECPG Components
- ECPG Preprocessing and Compiling
- Managing Database Connections
- Running SQL Commands
- Querying the Result Set
- Closing a Database Connection
- Host Variables
- Executing Dynamic SQL Statements
- Error Handling
- Preprocessor Directives
- Using Library Functions
- SQL Descriptor Area
- Examples
- ecpg and Pro*C Compatibility Comparison
- ECPG API Reference
- Development Based on the Go Driver
- Compatibility Reference
- Commissioning
-
SQL Optimization
- Query Execution Process
- Introduction to the SQL Execution Plan
- Optimization Process
- Updating Statistics
- Reviewing and Modifying a Table Definition
- Typical SQL Optimization Methods
- Experience in Rewriting SQL Statements
- Configuring Key Parameters for SQL Tuning
-
Hint-based Optimization
- Plan Hint Optimization
- Hint Specifying the Query Block Where the Hint Is Located
- Hint Specifying the Query Block and Schema of a Table
- Join Order Hints
- Join Operation Hints
- Rows Hints
- Stream Operation Hints
- Scan Hints
- Sublink Name Hints
- Skew Hints
- Parameterized Path Hint
- Hint Errors, Conflicts, and Other Warnings
- GUC Parameter Hints
- Hints for Selecting the Custom Plan or Generic Plan
- Hints Specifying Not to Expand Subqueries
- Hints Specifying Not to Use Global Plan Cache
- Hints of Parameterized Paths at the Same Level
- Hints for Setting Slow SQL Control Rules
- Bitmap Scan Hints
- Hint for Inner Table Materialization During Join
- AGG Hint
- Query Rewriting Hints
- Hints for Specifying ANY Sublink Pullup
- Hints for Specifying the Degree of Parallelism for Scans
- Hints for Specifying Whether to Use Semi-Join
- Hints for Specifying Whether to Use Minmax Optimization
- Checking the Implicit Conversion Performance
- Performing Optimization with SQL Patches
-
Optimization Cases
- Case: Selecting an Appropriate Distribution Key
- Case: Creating an Appropriate Index
- Case: Adjusting Distribution Keys
- Case: Adjusting the GUC Parameter best_agg_plan
- Case: Rewriting SQL Statements to Eliminate Subqueries
- Case: Rewriting SQL Statements to Eliminate Pruning Interference
- Case: Rewriting SQL Statements and Deleting in-clause
- Case: Modifying the GUC Parameter rewrite_rule
- Using DN Gather to Reduce Stream Nodes in the Plan
-
SQL Reference
- GaussDB SQL
- Keywords
-
Data Types
- Numeric Types
- Monetary Types
- Boolean Types
- Character Types
- Binary Types
- Date/Time Types
- Geometric Types
- Network Address Types
- Bit String Types
- UUID Type
- JSON/JSONB Types
- HLL Type
- Range Types
- Object Identifier Types
- Pseudo-Types
- Data Types Used by the Ledger Database
- XML Type
- XMLType
- ACLItem Type
- Array Types
-
Character Sets and Collations
- Character Sets and Collations of the Client Connection
- Database-level Character Sets and Collations
- Schema-level Character Sets and Collations
- Table-level Character Sets and Collations
- Column-level Character Sets and Collations
- Character Sets and Collations of Expressions of the String Type
- Rules for Combining Character Sets and Collations
- Constant and Macro
-
Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Pattern Matching Operators
- Arithmetic Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions
- Security Functions
- Ledger Database Functions
- Encrypted Functions and Operators
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
-
System Administration Functions
- Configuration Setting Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- Dual-Cluster DR Control Functions
- Dual-Cluster DR Query Functions
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Segment-Page Storage Functions
- Hash Bucket System Functions
- Undo System Functions
- Other Functions
- SPM Functions
- Statistics Information Functions
- Trigger Functions
- Hash Functions
- Prompt Message Function
- Fault Injection System Function
- Redistribution Functions
- Distribution Key Recommendation Functions
- Other System Functions
- Internal Functions
- AI Feature Functions
- Sensitive Data Discovery Function
- Dynamic Data Masking Functions
- Hotkey Feature Functions
- Global SysCache Functions
- Data Damage Detection and Repair Functions
- Functions of the XML Type
- Functions of the XMLType Type
- Pivot Table Functions
- UUID Functions
- SQL Statement Concurrency Control Function
- Obsolete Functions
- Expressions
- Pseudocolumn
- Type Conversion
- System Operation
- Controlling Transactions
-
SQL Syntax
- SQL Syntax
- DCL Syntax Overview
- DDL Syntax Overview
- DML Syntax Overview
- Other Syntax List
-
A
- ABORT
- ALTER AGGREGATE
- ALTER AUDIT POLICY
- ALTER COLUMN ENCRYPTION KEY
- ALTER COORDINATOR
- ALTER DATABASE
- ALTER DATABASE LINK
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER FOREIGN DATA WRAPPER
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER NODE
- ALTER NODE GROUP
- ALTER RESOURCE LABEL
- ALTER RESOURCE POOL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLESPACE
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER VIEW
- ANALYZE | ANALYSE
- B
-
C
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- COPY
- CREATE AGGREGATE
- CREATE AUDIT POLICY
- CREATE BARRIER
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE CONVERSION
- CREATE DATABASE
- CREATE DATABASE LINK
- CREATE DIRECTORY
- CREATE EXTENSION
- CREATE FOREIGN DATA WRAPPER
- CREATE FUNCTION
- CREATE GLOBAL INDEX
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE NODE
- CREATE NODE GROUP
- CREATE PROCEDURE
- CREATE RESOURCE LABEL
- CREATE RESOURCE POOL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE SCHEMA
- CREATE SECURITY LABEL
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLESPACE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE VIEW
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
-
D
- DEALLOCATE
- DECLARE
- DELETE
- DO
- DROP AGGREGATE
- DROP AUDIT POLICY
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATABASE LINK
- DROP DIRECTORY
- DROP FOREIGN DATA WRAPPER
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP NODE
- DROP NODE GROUP
- DROP OWNED
- DROP PROCEDURE
- DROP RESOURCE LABEL
- DROP RESOURCE POOL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP SCHEMA
- DROP SECURITY LABEL
- DROP SEQUENCE
- DROP SERVER
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP VIEW
- DROP WEAK PASSWORD DICTIONARY
- E
- F
- G
- I
- L
- M
- P
- R
- S
- T
- U
- V
- Appendix
- Best Practices
- User-defined Functions
- Stored Procedures
- Autonomous Transaction
-
System Catalogs and System Views
- Overview of System Catalogs and System Views
-
System Catalogs
- Partitioned Table
- OLTP Table Compression
- Encrypted Equality Query
- Communications
- Ledger Database
- SPM
- AI
- Auditing
- User and Permission Management
- Connection and Authentication
- Dynamic Data Masking
- DATABASE LINK
- Materialized Views
-
Other System Catalogs
- GS_ASP
- GS_DEPENDENCIES
- GS_DEPENDENCIES_OBJ
- GS_GLOBAL_CONFIG
- GS_JOB_ATTRIBUTE
- GS_JOB_ARGUMENT
- GS_PLAN_TRACE
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SECURITY_LABEL
- GS_SQL_PATCH
- GS_STATISTIC_EXT_HISTORY
- GS_STATISTIC_HISTORY
- GS_TABLESTATS_HISTORY
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WORKLOAD_RULE
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EXTENSION
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PLTEMPLATE
- PG_PROC
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_SET
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PGXC_CLASS
- PGXC_GROUP
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- STREAMING_STREAM
- STREAMING_CONT_QUERY
-
System Views
-
Partitioned Table
- ADM_IND_PARTITIONS
- ADM_IND_SUBPARTITIONS
- ADM_PART_COL_STATISTICS
- ADM_PART_INDEXES
- ADM_PART_TABLES
- ADM_SUBPART_KEY_COLUMNS
- ADM_TAB_PARTITIONS
- DB_IND_PARTITIONS
- DB_IND_SUBPARTITIONS
- DB_PART_COL_STATISTICS
- DB_PART_KEY_COLUMNS
- DB_PART_TABLES
- DB_SUBPART_KEY_COLUMNS
- DB_TAB_PARTITIONS
- DB_TAB_SUBPARTITIONS
- MY_IND_PARTITIONS
- MY_IND_SUBPARTITIONS
- MY_PART_COL_STATISTICS
- MY_PART_INDEXES
- MY_PART_KEY_COLUMNS
- MY_PART_TABLES
- MY_SUBPART_KEY_COLUMNS
- MY_TAB_PARTITIONS
- GS_STATIO_ALL_PARTITIONS
- GS_STAT_XACT_ALL_PARTITIONS
- GS_STAT_ALL_PARTITIONS
- OLTP Table Compression
-
Communications
- COMM_CLIENT_INFO
- GLOBAL_COMM_CLIENT_INFO
- GS_COMM_LISTEN_ADDRESS_EXT_INFO
- GS_GET_LISTEN_ADDRESS_EXT_INFO
- GS_LIBCOMM_FD_INFO
- GS_LIBCOMM_MEMORY_INFO
- GS_STATIC_THREADPOOL_CTRL_STATUS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_GET_INVALID_BACKENDS
- PG_POOLER_STATUS
- PGXC_COMM_DELAY
- PGXC_COMM_RECV_STREAM
- PGXC_COMM_SEND_STREAM
- PGXC_COMM_STATUS
-
Segment-Page Storage
- GLOBAL_GS_SEG_DATAFILES
- GLOBAL_GS_SEG_EXTENTS
- GLOBAL_GS_SEG_SEGMENTS
- GLOBAL_GS_SEG_SPC_EXTENTS
- GLOBAL_GS_SEG_SPC_SEGMENTS
- GS_SEG_DATAFILES
- GS_SEG_DATAFILE_LAYOUT
- GS_SEG_EXTENTS
- GS_SEG_SEGMENTS
- GS_SEG_SEGMENT_LAYOUT
- GS_SEG_SPC_EXTENTS
- GS_SEG_SPC_SEGMENTS
- GS_SEG_SPC_REMAIN_EXTENTS
- GS_SEG_SPC_REMAIN_SEGMENTS
- SPM
- Auditing
-
User and Permission Management
- ADM_COL_PRIVS
- ADM_ROLE_PRIVS
- ADM_ROLES
- ADM_SYS_PRIVS
- ADM_TAB_PRIVS
- ADM_USERS
- DB_COL_PRIVS
- DB_DIRECTORIES
- DB_TAB_PRIVS
- DB_USERS
- GS_DB_PRIVILEGES
- GS_LABELS
- MY_COL_PRIVS
- MY_ROLE_PRIVS
- MY_SYS_PRIVS
- PG_RLSPOLICIES
- PG_ROLES
- PG_SECLABELS
- PG_SHADOW
- PG_USER
- PG_USER_MAPPINGS
- ROLE_ROLE_PRIVS
- ROLE_SYS_PRIVS
- ROLE_TAB_PRIVS
- Dynamic Data Masking
- Transparent Encryption
- DATABASE LINK
- Materialized Views
-
Other System Views
- ADM_ARGUMENTS
- ADM_COL_COMMENTS
- ADM_COLL_TYPES
- ADM_CONS_COLUMNS
- ADM_CONSTRAINTS
- ADM_DATA_FILES
- ADM_DEPENDENCIES
- ADM_DIRECTORIES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_HIST_SQLTEXT
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_INDEXES
- ADM_OBJECTS
- ADM_PROCEDURES
- ADM_SCHEDULER_JOB_ARGS
- ADM_SCHEDULER_JOBS
- ADM_SCHEDULER_PROGRAM_ARGS
- ADM_SCHEDULER_PROGRAMS
- ADM_SCHEDULER_RUNNING_JOBS
- ADM_SEGMENTS
- ADM_SEQUENCES
- ADM_SOURCE
- ADM_SYNONYMS
- ADM_TAB_COL_STATISTICS
- ADM_TAB_COLS
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_HISTOGRAMS
- ADM_TAB_STATISTICS
- ADM_TAB_STATS_HISTORY
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TRIGGERS
- ADM_TYPE_ATTRS
- ADM_TYPES
- ADM_VIEWS
- DB_ARGUMENTS
- DB_ALL_TABLES
- DB_COL_COMMENTS
- DB_COLL_TYPES
- DB_CONS_COLUMNS
- DB_CONSTRAINTS
- DB_DEPENDENCIES
- DB_IND_COLUMNS
- DB_IND_EXPRESSIONS
- DB_INDEXES
- DB_OBJECTS
- DB_PROCEDURES
- DB_SCHEDULER_JOB_ARGS
- DB_SCHEDULER_PROGRAM_ARGS
- DB_SEQUENCES
- DB_SOURCE
- DB_SYNONYMS
- DB_TAB_COL_STATISTICS
- DB_TAB_COLUMNS
- DB_TAB_COMMENTS
- DB_TAB_HISTOGRAMS
- DB_TAB_MODIFICATIONS
- DB_TAB_STATS_HISTORY
- DB_TABLES
- DB_TRIGGERS
- DB_TYPES
- DB_VIEWS
- DICT
- DICTIONARY
- DUAL
- DV_SESSIONS
- DV_SESSION_LONGOPS
- GET_GLOBAL_PREPARED_XACTS
- GLOBAL_BAD_BLOCK_INFO
- GLOBAL_CLEAR_BAD_BLOCK_INFO
- GLOBAL_SQL_PATCH
- GLOBAL_STAT_HOTKEYS_INFO
- GLOBAL_WAL_SENDER_STATUS
- GS_ALL_CONTROL_GROUP_INFO
- GS_ALL_PREPARED_STATEMENTS
- GS_BUCKET_LOCKS
- GS_GET_CONTROL_GROUP_INFO
- GS_GLOBAL_ARCHIVE_STATUS
- GS_GSC_MEMORY_DETAIL
- GS_LSC_MEMORY_DETAIL
- GS_MY_PLAN_TRACE
- GS_SESSION_ALL_SETTINGS
- GS_SQL_COUNT
- GS_WORKLOAD_RULE_STAT
- GV_INSTANCE
- GV_SESSION
- MPP_TABLES
- MY_AUDIT_TRAIL
- MY_COL_COMMENTS
- MY_COLL_TYPES
- MY_CONS_COLUMNS
- MY_CONSTRAINTS
- MY_DEPENDENCIES
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_INDEXES
- MY_JOBS
- MY_OBJECTS
- MY_PROCEDURES
- MY_SCHEDULER_JOB_ARGS
- MY_SCHEDULER_JOBS
- MY_SCHEDULER_PROGRAM_ARGS
- MY_SEQUENCES
- MY_SOURCE
- MY_SYNONYMS
- MY_TAB_COL_STATISTICS
- MY_TAB_COLUMNS
- MY_TAB_COMMENTS
- MY_TAB_HISTOGRAMS
- MY_TAB_MODIFICATIONS
- MY_TAB_STATS_HISTORY
- MY_TAB_STATISTICS
- MY_TABLES
- MY_TABLESPACES
- MY_TRIGGERS
- MY_TYPE_ATTRS
- MY_TYPES
- MY_VIEWS
- NLS_DATABASE_PARAMETERS
- NLS_INSTANCE_PARAMETERS
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_AVAILABLE_EXTENSIONS
- PG_CONTROL_GROUP_CONFIG
- PG_CURSORS
- PG_EXT_STATS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_REPLICATION_SLOTS
- PG_RULES
- PG_RUNNING_XACTS
- PG_SETTINGS
- PG_SHARED_MEMORY_DETAIL
- PG_STATS
- PG_STAT_ACTIVITY
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_REPLICATION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_TABLES
- PG_THREAD_WAIT_STATUS
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_VARIABLE_INFO
- PG_VIEWS
- PGXC_GET_STAT_ALL_TABLES
- PGXC_GET_TABLE_SKEWNESS
- PGXC_NODE_ENV
- PGXC_OS_THREADS
- PGXC_PREPARED_XACTS
- PGXC_RUNNING_XACTS
- PGXC_STAT_ACTIVITY
- PGXC_STAT_BAD_BLOCK
- PGXC_SQL_COUNT
- PGXC_THREAD_WAIT_STATUS
- PGXC_TOTAL_MEMORY_DETAIL
- PGXC_VARIABLE_INFO
- PLAN_TABLE
- PV_FILE_STAT
- PV_INSTANCE_TIME
- PV_OS_RUN_INFO
- PV_REDO_STAT
- PV_SESSION_MEMORY
- PV_SESSION_MEMORY_CONTEXT
- PV_SESSION_MEMORY_DETAIL
- PV_SESSION_STAT
- PV_SESSION_TIME
- PV_THREAD_MEMORY_CONTEXT
- PV_TOTAL_MEMORY_DETAIL
- SYS_DUMMY
- V_INSTANCE
- V_MYSTAT
- V_SESSION
- V$GLOBAL_OPEN_CURSOR
- V$GLOBAL_TRANSACTION
- V$LOCK
- V$NLS_PARAMETERS
- V$OPEN_CURSOR
- V$SESSION_WAIT
- V$SYSSTAT
- V$SYSTEM_EVENT
- V$VERSION
-
Partitioned Table
- Discarded
-
Schemas
- Information Schema
-
DBE_PERF Schema
- OS
- Instance
- File
-
Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- STAT_BAD_BLOCK
- SUMMARY_STAT_BAD_BLOCK
- GLOBAL_STAT_BAD_BLOCK
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_FUNCTIONS
- GLOBAL_STAT_USER_FUNCTIONS
- Workload
-
Session and Thread
- SESSION_STAT
- GLOBAL_SESSION_STAT
- SESSION_TIME
- GLOBAL_SESSION_TIME
- SESSION_MEMORY
- GLOBAL_SESSION_MEMORY
- SESSION_MEMORY_DETAIL
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT_ACTIVITY
- THREAD_WAIT_STATUS
- GLOBAL_THREAD_WAIT_STATUS
- LOCAL_THREADPOOL_STATUS
- GLOBAL_THREADPOOL_STATUS
- SESSION_CPU_RUNTIME
- SESSION_MEMORY_RUNTIME
- LOCAL_ACTIVE_SESSION
- GLOBAL_ACTIVE_SESSION
- Transaction
-
Cache and I/O
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_SYS_TABLES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_SEQUENCES
- STATIO_ALL_TABLES
- SUMMARY_STATIO_ALL_TABLES
- GLOBAL_STATIO_ALL_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_ALL_SEQUENCES
- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
- Communication Library
-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- POOLER_STATUS
- GLOBAL_COMM_CHECK_CONNECTION_STATUS
- GLOBAL_CKPT_STATUS
- GLOBAL_DOUBLE_WRITE_STATUS
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_POOLER_STATUS
- GLOBAL_RECORD_RESET_TIME
- GLOBAL_REDO_STATUS
- GLOBAL_RECOVERY_STATUS
- CLASS_VITAL_INFO
- USER_LOGIN
- SUMMARY_USER_LOGIN
- GLOBAL_GET_BGWRITER_STATUS
- GLOBAL_SINGLE_FLUSH_DW_STATUS
- GLOBAL_CANDIDATE_STATUS
- PARALLEL_DECODE_STATUS
- GLOBAL_PARALLEL_DECODE_STATUS
- PARALLEL_DECODE_THREAD_INFO
- GLOBAL_PARALLEL_DECODE_THREAD_INFO
- GLOBAL_ADIO_COMPLETER_STATUS
- GLOBAL_AIO_SLOT_USAGE_STATUS
- Lock
- Wait Event
- Configuration
- Operator
- Workload Manager
- Global Plan Cache
- RTO & RPO
- AI Watchdog
- Discarded
- WDR Snapshot Schema
-
DBE_SQL_UTIL Schema
- DBE_SQL_UTIL.create_hint_sql_patch
- DBE_SQL_UTIL.create_abort_sql_patch
- DBE_SQL_UTIL.drop_sql_patch
- DBE_SQL_UTIL.enable_sql_patch
- DBE_SQL_UTIL.disable_sql_patch
- DBE_SQL_UTIL.show_sql_patch
- DBE_SQL_UTIL.create_hint_sql_patch
- DBE_SQL_UTIL.create_abort_sql_patch
- DBE_SQL_UTIL.create_remote_hint_sql_patch
- DBE_SQL_UTIL.create_remote_abort_sql_patch
- DBE_SQL_UTIL.drop_remote_sql_patch
- DBE_SQL_UTIL.enable_remote_sql_patch
- DBE_SQL_UTIL.disable_remote_sql_patch
-
DBE_PLDEBUGGER Schema
- DBE_PLDEBUGGER.turn_on
- DBE_PLDEBUGGER.turn_off
- DBE_PLDEBUGGER.local_debug_server_info
- DBE_PLDEBUGGER.attach
- DBE_PLDEBUGGER.info_locals
- DBE_PLDEBUGGER.next
- DBE_PLDEBUGGER.continue
- DBE_PLDEBUGGER.abort
- DBE_PLDEBUGGER.print_var
- DBE_PLDEBUGGER.info_code
- DBE_PLDEBUGGER.step
- DBE_PLDEBUGGER.add_breakpoint
- DBE_PLDEBUGGER.delete_breakpoint
- DBE_PLDEBUGGER.info_breakpoints
- DBE_PLDEBUGGER.backtrace
- DBE_PLDEBUGGER.enable_breakpoint
- DBE_PLDEBUGGER.disable_breakpoint
- DBE_PLDEBUGGER.finish
- DBE_PLDEBUGGER.set_var
- DBE_PLDEBUGGER.backtrace
- DBE_PLDEBUGGER.error_end
- DBE_PLDEBUGGER.error_info_locals
-
Configuring GUC Parameters
- Viewing Parameters
- Setting Parameters
-
GUC Parameters
- GUC Parameter Usage
- File Location
- Connection and Authentication
- Resource Consumption
- Parallel Data Import
- Write Ahead Log
- HA Replication
- Query Planning
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Autovacuum
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Fault Tolerance
- Connection Pool Parameters
- Cluster Transaction Parameters
- Dual-Cluster Replication Parameters
- Developer Options
- Auditing
- Transaction Monitoring
- CM Parameters
- GTM Parameters
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Event
- Query
- System Performance Snapshot
- Security Configuration
- HyperLogLog
- User-defined Functions
- Scheduled Task
- Thread Pool
- Backup and Restoration
- AI Features
- Global SysCache Parameters
- Read Parameters of the Standby Node in a Distributed System
- Restoring Data on the Standby Node
- Undo
- Rollback Parameters
- DCF Parameters Settings
- Flashback
- Ledger Database
- Creating an Index Online
- Data Lifecycle Management: OLTP Table Compression
- Session-level Transaction Pushdown and Related Parameters
- Enhanced TOAST
- Reserved Parameters
- Appendix
-
FAQs
- What is the maximum number of columns in a single GaussDB table?
- How do I query the partition and index information of a partitioned table?
- What is OID?
- What is UDF?
- What wildcards are supported in GaussDB? How do I use them?
- Is there a limit on the length of a database object name?
- How do I view the creation time of a table?
- How do I create indexes in parallel?
- How do I create an auto-increment column?
- Can I query the GaussDB memory usage through SQL statements?
- What are the differences between LIMIT 2, LIMIT 2,3 and LIMIT 2 OFFSET 3?
- How do I create a column whose default value is the current time?
- How do I determine whether a column is null?
- How do I obtain the username for connecting to a database?
- How do I query the time difference between two time points?
- What are the types of SQL languages?
- What is the function of a trigger?
- What are the four characteristics of correctly executing database transactions?
- What are the differences between the DROP, TRUNCATE, and DELETE methods in GaussDB?
- How many bytes does a Chinese character occupy in GaussDB?
-
Developer Guide(Centralized_8.x)
- Database System Overview
- Database Security
- Database Quick Start
- Development and Design Proposal
-
Application Development Guide
- Development Specifications
- Obtaining the Driver Package
-
Development Based on JDBC
- JDBC Packages, Driver Classes, and Environment Classes
- Development Process
- Loading the Driver
- Connecting to a Database
- Connecting to a Database (Using SSL)
- Connecting to a Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Database Connection
- Log Management
- Examples: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Importing and Exporting Data Through Local Files
- Example: Migrating Data from MY
- Example: Logic Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
-
JDBC API Reference
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- PGReplicationConnection
- PGReplicationStream
- ChainedStreamBuilder
- ChainedCommonStreamBuilder
- PGobject
- Common JDBC Parameters
- Troubleshooting
- Mapping for JDBC Data Types
- Development Based on ODBC
- Development Based on libpq
- Psycopg-based Development
- Development Based on the Go Driver
-
ECPG-based Development
- Development Process
- ECPG Components
- ECPG Preprocessing and Compiling
- Managing Database Connections
- Running SQL Commands
- Querying the Result Set
- Closing a Database Connection
- Host Variables
- Executing Dynamic SQL Statements
- Error Handling
- Preprocessor Directives
- Using Library Functions
- SQL Descriptor Area
- Examples
- ecpg and Pro*C Compatibility Comparison
- ECPG API Reference
- Compatibility Reference
- Commissioning
-
SQL Optimization
- Query Execution Process
- Introduction to the SQL Execution Plan
- Optimization Process
- Updating Statistics
- Reviewing and Modifying a Table Definition
- Typical SQL Optimization Methods
- Experience in Rewriting SQL Statements
- Configuring Key Parameters for SQL Tuning
-
Hint-based Optimization
- Plan Hint Optimization
- Hints for Specifying the Query Block Where the Hint Is Located
- Hints for Specifying the Query Block and Schema of a Table
- Join Order Hints
- Join Operation Hints
- Rows Hints
- Stream Operation Hints
- Scan Operation Hints
- Sublink Name Hints
- Hint Errors, Conflicts, and Other Warnings
- Optimizer GUC Parameter Hints
- Hints for Selecting the Custom Plan or Generic Plan
- Hints Specifying Not to Expand Subqueries
- Hint Specifying Not to Use Global Plan Cache
- Hints of Parameterized Paths at the Same Level
- Hints for Setting Slow SQL Control Rules
- Hint for Adaptive Plan Selection
- Hints for Materializing a Sub-plan Result
- Bitmap Scan Hints
- Hints for Inner Table Materialization During Join
- AGG Hint
- Query Rewriting Hints
- Outline Hints
- Hints for Specifying ANY Sublink Pullup
- Hints for Specifying the Degree of Parallelism for Scans
- Hints for Specifying Whether to Use Semi-Join
- Hints for Specifying the Stream Hashagg Optimization
- Hints for Specifying Whether to Use Minmax Optimization
- Introduction to Plan Trace
- Performing Optimization with SQL Patches
- Optimization Cases
-
SQL Reference
- GaussDB SQL
- Keywords
-
Data Types
- Numeric Types
- Monetary Types
- Boolean Types
- Character Types
- Binary Types
- Date/Time Types
- Geometric Types
- Network Address Types
- Bit String Types
- UUID Type
- JSON/JSONB Types
- HLL Type
- Range Types
- Object Identifier Types
- Pseudo-Types
- XML Type
- XMLType
- Data Types Used by the Ledger Database
- SET Type
- ACLItem Type
- Array Types
- Vector Data Types
-
Character Sets and Collations
- Character Sets and Collations of the Client Connection
- Database-level Character Sets and Collations
- Schema-level Character Sets and Collations
- Table-level Character Sets and Collations
- Column-level Character Sets and Collations
- Character Sets and Collations of Expressions of the String Type
- Rules for Combining Character Sets and Collations
- Constant and Macro
-
Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Pattern Matching Operators
- Arithmetic Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions
- Security Functions
- Ledger Database Functions
- Encrypted Functions and Operators
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
-
System Administration Functions
- Configuration Settings Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- DR Control Functions for Dual-Database Instances
- DR Query Functions for Dual-Database Instances
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Segment-Page Storage Functions
- Hash Bucket System Functions
- Other Functions
- Undo System Functions
- SPM Functions
- Statistics Information Functions
- Trigger Functions
- Hash Functions
- Prompt Message Function
- Global Temporary Table Functions
- Fault Injection System Function
- AI Feature Functions
- Sensitive Data Discovery Function
- Dynamic Data Masking Functions
- Hierarchical Recursion Query Functions
- Other System Functions
- Internal Functions
- Global SysCache Functions
- Data Damage Detection and Repair Functions
- Functions of the XML Type
- Functions of the XMLType Type
- Global PL/SQL Cache Functions
- Pivot Table Functions
- UUID Functions
- SQL Statement Concurrency Control Function
- Vector Calculation Interfaces and Functions
- Deprecated Functions
- Expressions
- Pseudocolumn
- Type Conversion
- System Operation
- Controlling Transactions
-
SQL Syntax
- SQL Syntax
- DCL Syntax Overview
- DDL Syntax Overview
- DML Syntax Overview
- Other Syntax List
-
A
- ABORT
- ALTER AGGREGATE
- ALTER AUDIT POLICY
- ALTER COLUMN ENCRYPTION KEY
- ALTER DATABASE
- ALTER DATABASE LINK
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER EVENT
- ALTER EXTENSION
- ALTER FOREIGN DATA WRAPPER
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER OPERATOR
- ALTER PACKAGE
- ALTER PROCEDURE
- ALTER RESOURCE LABEL
- ALTER RESOURCE POOL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLE SUBPARTITION
- ALTER TABLESPACE
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER USER MAPPING
- ALTER VIEW
- ANALYZE | ANALYSE
- B
-
C
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- COPY
- CREATE AGGREGATE
- CREATE AUDIT POLICY
- CREATE CAST
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE CONVERSION
- CREATE DATABASE
- CREATE DATABASE LINK
- CREATE DIRECTORY
- CREATE EVENT
- CREATE EXTENSION
- CREATE FOREIGN DATA WRAPPER
- CREATE FUNCTION
- CREATE GLOBAL INDEX
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE OPERATOR
- CREATE OPERATOR CLASS
- CREATE PACKAGE
- CREATE PROCEDURE
- CREATE RESOURCE LABEL
- CREATE RESOURCE POOL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE RULE
- CREATE SCHEMA
- CREATE SECURITY LABEL
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TABLESPACE
- CREATE TABLE SUBPARTITION
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE USER MAPPING
- CREATE VIEW
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
-
D
- DEALLOCATE
- DECLARE
- DELETE
- DO
- DROP AGGREGATE
- DROP AUDIT POLICY
- DROP CAST
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATABASE LINK
- DROP DIRECTORY
- DROP EVENT
- DROP EXTENSION
- DROP FOREIGN DATA WRAPPER
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP OPERATOR
- DROP OWNED
- DROP PACKAGE
- DROP PROCEDURE
- DROP RESOURCE LABEL
- DROP RESOURCE POOL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP RULE
- DROP SCHEMA
- DROP SECURITY LABEL
- DROP SEQUENCE
- DROP SERVER
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP USER MAPPING
- DROP VIEW
- DROP WEAK PASSWORD DICTIONARY
- E
- F
- G
- I
- L
- M
- P
- R
- S
- T
- U
- V
- Appendix
- Best Practices
- User-defined Functions
-
Stored Procedure
- Stored Procedure
- Data Types
- Data Type Conversion
- Arrays, Collections, and Records
- DECLARE Syntax
- Basic Statements
- Dynamic Statements
- Control Statements
- Transaction Management
- Other Statements
- Cursors
- Advanced Packages
- Retry Management
- Debugging
- Package
- Autonomous Transaction
-
System Catalogs and System Views
- Overview of System Catalogs and System Views
-
System Catalogs
- Partitioned Table
- OLTP Table Compression
- Encrypted Equality Query
- Communications
- Ledger Database
- SPM
- AI
- Auditing
- User and Permission Management
- Connection and Authentication
- Dynamic Data Masking
- DATABASE LINK
- Materialized Views
-
Other System Catalogs
- GS_ASP
- GS_DEPENDENCIES
- GS_DEPENDENCIES_OBJ
- GS_GLOBAL_CONFIG
- GS_JOB_ARGUMENT
- GS_JOB_ATTRIBUTE
- GS_PACKAGE
- GS_PLAN_TRACE
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SECURITY_LABEL
- GS_SQL_PATCH
- GS_STATISTIC_EXT_HISTORY
- GS_STATISTIC_HISTORY
- GS_TABLESTATS_HISTORY
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WORKLOAD_RULE
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EXTENSION
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PLTEMPLATE
- PG_PROC
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SET
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PGXC_CLASS
- PGXC_GROUP
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- STREAMING_STREAM
- STREAMING_CONT_QUERY
-
System Views
-
Partitioned Table
- ADM_IND_PARTITIONS
- ADM_IND_SUBPARTITIONS
- ADM_PART_COL_STATISTICS
- ADM_PART_INDEXES
- ADM_PART_TABLES
- ADM_SUBPART_COL_STATISTICS
- ADM_SUBPART_KEY_COLUMNS
- ADM_TAB_SUBPARTITIONS
- ADM_TAB_PARTITIONS
- DB_IND_PARTITIONS
- DB_IND_SUBPARTITIONS
- DB_PART_COL_STATISTICS
- DB_PART_INDEXES
- DB_PART_KEY_COLUMNS
- DB_PART_TABLES
- DB_SUBPART_COL_STATISTICS
- DB_SUBPART_KEY_COLUMNS
- DB_TAB_PARTITIONS
- DB_TAB_SUBPARTITIONS
- MY_IND_PARTITIONS
- MY_IND_SUBPARTITIONS
- MY_PART_COL_STATISTICS
- MY_PART_INDEXES
- MY_PART_KEY_COLUMNS
- MY_PART_TABLES
- MY_SUBPART_COL_STATISTICS
- MY_SUBPART_KEY_COLUMNS
- MY_TAB_PARTITIONS
- MY_TAB_SUBPARTITIONS
- GS_STATIO_ALL_PARTITIONS
- GS_STAT_XACT_ALL_PARTITIONS
- GS_STAT_ALL_PARTITIONS
- OLTP Table Compression
- Communications
- Segment-Page Storage
- SPM
- Auditing
-
User and Permission Management
- ADM_COL_PRIVS
- ADM_ROLE_PRIVS
- ADM_ROLES
- ADM_SYS_PRIVS
- ADM_TAB_PRIVS
- ADM_USERS
- DB_COL_PRIVS
- DB_DIRECTORIES
- DB_TAB_PRIVS
- DB_USERS
- GS_DB_PRIVILEGES
- GS_LABELS
- MY_COL_PRIVS
- MY_ROLE_PRIVS
- MY_SYS_PRIVS
- PG_RLSPOLICIES
- PG_ROLES
- PG_SECLABELS
- PG_SHADOW
- PG_USER
- PG_USER_MAPPINGS
- ROLE_ROLE_PRIVS
- ROLE_SYS_PRIVS
- ROLE_TAB_PRIVS
- Dynamic Data Masking
- Transparent Encryption
- DATABASE LINK
- Materialized Views
-
Other System Views
- ADM_ARGUMENTS
- ADM_COL_COMMENTS
- ADM_COLL_TYPES
- ADM_CONS_COLUMNS
- ADM_CONSTRAINTS
- ADM_DATA_FILES
- ADM_DEPENDENCIES
- ADM_DIRECTORIES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_HIST_SQLTEXT
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_INDEXES
- ADM_OBJECTS
- ADM_PROCEDURES
- ADM_RECYCLEBIN
- ADM_SCHEDULER_JOB_ARGS
- ADM_SCHEDULER_JOBS
- ADM_SCHEDULER_PROGRAM_ARGS
- ADM_SCHEDULER_PROGRAMS
- ADM_SCHEDULER_RUNNING_JOBS
- ADM_SEGMENTS
- ADM_SEQUENCES
- ADM_SOURCE
- ADM_SYNONYMS
- ADM_TAB_COL_STATISTICS
- ADM_TAB_COLS
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_HISTOGRAMS
- ADM_TAB_STATISTICS
- ADM_TAB_STATS_HISTORY
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TRIGGERS
- ADM_TYPE_ATTRS
- ADM_TYPES
- ADM_VIEWS
- DB_ARGUMENTS
- DB_ALL_TABLES
- DB_COL_COMMENTS
- DB_COLL_TYPES
- DB_CONS_COLUMNS
- DB_CONSTRAINTS
- DB_DEPENDENCIES
- DB_ERRORS
- DB_IND_COLUMNS
- DB_IND_EXPRESSIONS
- DB_INDEXES
- DB_OBJECTS
- DB_PROCEDURES
- DB_SCHEDULER_JOB_ARGS
- DB_SCHEDULER_PROGRAM_ARGS
- DB_SEQUENCES
- DB_SOURCE
- DB_SYNONYMS
- DB_TAB_COL_STATISTICS
- DB_TAB_COLUMNS
- DB_TAB_COMMENTS
- DB_TAB_HISTOGRAMS
- DB_TAB_MODIFICATIONS
- DB_TAB_STATS_HISTORY
- DB_TABLES
- DB_TRIGGERS
- DB_TYPES
- DB_VIEWS
- DICT
- DICTIONARY
- DUAL
- DV_SESSIONS
- DV_SESSION_LONGOPS
- GS_ALL_CONTROL_GROUP_INFO
- GS_ALL_PREPARED_STATEMENTS
- GS_COMM_PROXY_THREAD_STATUS
- GS_FILE_STAT
- GS_GET_CONTROL_GROUP_INFO
- GS_GLC_MEMORY_DETAIL
- GS_GLOBAL_ARCHIVE_STATUS
- GS_GSC_MEMORY_DETAIL
- GS_INSTANCE_TIME
- GS_LSC_MEMORY_DETAIL
- GS_MY_PLAN_TRACE
- GS_OS_RUN_INFO
- GS_REDO_STAT
- GS_SESSION_ALL_SETTINGS
- GS_SESSION_MEMORY
- GS_SESSION_MEMORY_CONTEXT
- GS_SESSION_MEMORY_DETAIL
- GS_SESSION_STAT
- GS_SESSION_TIME
- GS_SHARED_MEMORY_DETAIL
- GS_SQL_COUNT
- GS_THREAD_MEMORY_CONTEXT
- GS_TOTAL_MEMORY_DETAIL
- GS_TOTAL_NODEGROUP_MEMORY_DETAIL
- GS_WORKLOAD_RULE_STAT
- GV_INSTANCE
- GV_SESSION
- MPP_TABLES
- MY_AUDIT_TRAIL
- MY_COL_COMMENTS
- MY_COLL_TYPES
- MY_CONS_COLUMNS
- MY_CONSTRAINTS
- MY_DEPENDENCIES
- MY_ERRORS
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_INDEXES
- MY_JOBS
- MY_OBJECTS
- MY_PROCEDURES
- MY_RECYCLEBIN
- MY_SCHEDULER_JOB_ARGS
- MY_SCHEDULER_JOBS
- MY_SCHEDULER_PROGRAM_ARGS
- MY_SEQUENCES
- MY_SOURCE
- MY_SYNONYMS
- MY_TAB_COL_STATISTICS
- MY_TAB_COLUMNS
- MY_TAB_COMMENTS
- MY_TAB_HISTOGRAMS
- MY_TAB_MODIFICATIONS
- MY_TAB_STATS_HISTORY
- MY_TAB_STATISTICS
- MY_TABLES
- MY_TABLESPACES
- MY_TRIGGERS
- MY_TYPE_ATTRS
- MY_TYPES
- MY_VIEWS
- NLS_DATABASE_PARAMETERS
- NLS_INSTANCE_PARAMETERS
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_AVAILABLE_EXTENSIONS
- PG_CONTROL_GROUP_CONFIG
- PG_CURSORS
- PG_EXT_STATS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_GTT_RELSTATS
- PG_GTT_STATS
- PG_GTT_ATTACHED_PIDS
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_REPLICATION_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RULES
- PG_RUNNING_XACTS
- PG_SETTINGS
- PG_STATS
- PG_STAT_ACTIVITY
- PG_STAT_ACTIVITY_NG
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_REPLICATION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_TABLES
- PG_THREAD_WAIT_STATUS
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_VARIABLE_INFO
- PG_VIEWS
- PGXC_PREPARED_XACTS
- PGXC_THREAD_WAIT_STATUS
- PLAN_TABLE
- SYS_DUMMY
- V_INSTANCE
- V_MYSTAT
- V_SESSION
- V$GLOBAL_TRANSACTION
- V$LOCK
- V$NLS_PARAMETERS
- V$OPEN_CURSOR
- V$SESSION_WAIT
- V$SYSSTAT
- V$SYSTEM_EVENT
- V$VERSION
-
Partitioned Table
- Discarded
-
Schemas
- Information Schema
-
DBE_PERF Schema
- OS
- Instance
- Memory
- File
-
Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- STAT_BAD_BLOCK
- SUMMARY_STAT_BAD_BLOCK
- GLOBAL_STAT_BAD_BLOCK
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_FUNCTIONS
- GLOBAL_STAT_USER_FUNCTIONS
- Workload
-
Session/Thread
- SESSION_STAT
- GLOBAL_SESSION_STAT
- SESSION_TIME
- GLOBAL_SESSION_TIME
- SESSION_MEMORY
- GLOBAL_SESSION_MEMORY
- SESSION_MEMORY_DETAIL
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT_ACTIVITY
- THREAD_WAIT_STATUS
- GLOBAL_THREAD_WAIT_STATUS
- LOCAL_THREADPOOL_STATUS
- GLOBAL_THREADPOOL_STATUS
- LOCAL_ACTIVE_SESSION
- Transaction
- Query
-
Cache/IO
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_SYS_TABLES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_SEQUENCES
- STATIO_ALL_TABLES
- SUMMARY_STATIO_ALL_TABLES
- GLOBAL_STATIO_ALL_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_ALL_SEQUENCES
- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- GLOBAL_CKPT_STATUS
- GLOBAL_DOUBLE_WRITE_STATUS
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_RECORD_RESET_TIME
- GLOBAL_REDO_STATUS
- GLOBAL_RECOVERY_STATUS
- CLASS_VITAL_INFO
- USER_LOGIN
- SUMMARY_USER_LOGIN
- GLOBAL_SINGLE_FLUSH_DW_STATUS
- GLOBAL_CANDIDATE_STATUS
- PARALLEL_DECODE_STATUS
- GLOBAL_PARALLEL_DECODE_STATUS
- PARALLEL_DECODE_THREAD_INFO
- GLOBAL_PARALLEL_DECODE_THREAD_INFO
- GLOBAL_ADIO_COMPLETER_STATUS
- GLOBAL_AIO_SLOT_USAGE_STATUS
- Lock
- Wait Events
- Configuration
- Operator
- Workload Manager
- Global Plancache
- RTO & RPO
- AI Watchdog
- WDR Snapshot Schema
-
DBE_PLDEBUGGER Schema
- DBE_PLDEBUGGER.turn_on
- DBE_PLDEBUGGER.turn_off
- DBE_PLDEBUGGER.local_debug_server_info
- DBE_PLDEBUGGER.attach
- DBE_PLDEBUGGER.info_locals
- DBE_PLDEBUGGER.next
- DBE_PLDEBUGGER.continue
- DBE_PLDEBUGGER.abort
- DBE_PLDEBUGGER.print_var
- DBE_PLDEBUGGER.info_code
- DBE_PLDEBUGGER.step
- DBE_PLDEBUGGER.add_breakpoint
- DBE_PLDEBUGGER.delete_breakpoint
- DBE_PLDEBUGGER.info_breakpoints
- DBE_PLDEBUGGER.backtrace
- DBE_PLDEBUGGER.enable_breakpoint
- DBE_PLDEBUGGER.disable_breakpoint
- DBE_PLDEBUGGER.finish
- DBE_PLDEBUGGER.set_var
- DBE_PLDEBUGGER.error_backtrace
- DBE_PLDEBUGGER.error_end
- DBE_PLDEBUGGER.error_info_locals
- DB4AI Schema
- DBE_PLDEVELOPER
- DBE_SQL_UTIL Schema
-
Configuring GUC Parameters
- Viewing Parameters
- Setting Parameters
-
GUC Parameters
- GUC Parameter Usage
- File Location
- Connection and Authentication
- Resource Consumption
- Data Import and Export
- Write Ahead Log
- HA Replication
- Query Planning
- SPM
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Autovacuum
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Fault Tolerance
- Connection Pool Parameters
- Transaction
- Replication Parameters of Two Database Instances
- Developer Options
- Auditing
- CM Parameters
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Events
- Query
- System Performance Snapshot
- Security Configuration
- Global Temporary Table
- HyperLogLog
- User-defined Functions
- Scheduled Task
- Thread Pool
- Backup and Restoration
- Undo
- DCF Parameters Settings
- Flashback
- Rollback Parameters
- AI Features
- Global SysCache Parameters
- Restoring Data on the Standby Node
- Delimiter
- Global PL/SQL Cache Parameters
- Ledger Database
- Creating an Index Online
- Data Lifecycle Management: OLTP Table Compression
- Vector Database Parameters
- Enhanced TOAST
- Reserved Parameters
-
FAQ
- What is the maximum number of columns in a single GaussDB table?
- How do I query the partition and index information of a partitioned table?
- What is OID?
- What is UDF?
- What wildcards are supported in GaussDB? How do I use them?
- Is there a limit on the length of a database object name?
- How do I view the creation time of a table?
- How do I create indexes in parallel?
- How do I create an auto-increment column?
- Can I query the GaussDB memory usage through SQL statements?
- What are the differences between LIMIT 2, LIMIT 2,3 and LIMIT 2 OFFSET 3?
- How do I create a column whose default value is the current time?
- How do I determine whether a column is null?
- How do I obtain the username for connecting to a database?
- How do I query the time difference between two time points?
- What are the types of SQL languages?
- What is the function of a trigger?
- What are the four characteristics of correctly executing database transactions?
- What are the differences between the DROP, TRUNCATE, and DELETE methods in GaussDB?
- How many bytes does a Chinese character occupy in GaussDB?
-
Developer Guide(Distributed_3.x)
- Database System Overview
- Database Security
- Database Quick Start
- Development and Design Proposal
-
Application Development Guide
- Development Specifications
- Obtaining the Driver Package
-
Development Based on JDBC
- JDBC Package, Driver Class, and Environment Class
- Development Process
- Loading a Driver
- Connecting to a Database
- Connecting to a Database (Using SSL)
- Connecting to a Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Connection
- Log Management
- Examples: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Logical Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
-
JDBC Interface Reference
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- PGReplicationConnection
- PGReplicationStream
- ChainedStreamBuilder
- ChainedCommonStreamBuilder
- Common JDBC Parameters
- FAQs
- Mapping for JDBC Data Types
- Development Based on ODBC
- Development Based on libpq
- Psycopg-based Development
-
ECPG-based Development
- Development Process
- ecpg Components
- ecpg Preprocessing and Compiling
- Managing Database Connections
- Running SQL Commands
- Querying the Result Set
- Closing a Database Connection
- Host Variables
- Executing Dynamic SQL Statements
- Error Handling
- Preprocessor Directives
- Using Library Functions
- SQL Descriptor Area
- Examples
- ecpg and Pro*C Compatibility Comparison
- ECPG API Reference
- Development Based on the Go Driver
- Debugging
-
SQL Optimization
- Query Execution Process
- Introduction to the SQL Execution Plan
- Optimization Process
- Updating Statistics
- Reviewing and Modifying a Table Definition
- Typical SQL Optimization Methods
- Experience in Rewriting SQL Statements
- Configuring Key Parameters for SQL Tuning
-
Hint-based Tuning
- Plan Hint Optimization
- Hint Specifying the Query Block Where the Hint Is Located
- Hint Specifying the Query Block and Schema of a Table
- Join Order Hints
- Join Operation Hints
- Rows Hints
- Stream Operation Hints
- Scan Hints
- Sublink Name Hints
- Skew Hints
- Parameterized Path Hint
- Hint Errors, Conflicts, and Other Warnings
- GUC Parameter Hints
- Hints for Selecting the Custom Plan or Generic Plan
- Hints Specifying Not to Expand Subqueries
- Hints Specifying Not to Use Global Plan Cache
- Hint of Parameterized Paths at the Same Level
- Hint for Setting Slow SQL Control Rules
- Bitmap Scan Hints
- Hint for Inner Table Materialization During Join
- AGG Hint
- Checking the Implicit Conversion Performance
- Tuning with SQL PATCH
-
Optimization Cases
- Case: Selecting an Appropriate Distribution Key
- Case: Creating an Appropriate Index
- Case: Adjusting Distribution Keys
- Case: Adjusting the GUC Parameter best_agg_plan
- Case: Rewriting SQL and Deleting Subqueries (1)
- Case: Rewriting SQL Statements to Eliminate Pruning Interference
- Case: Rewriting SQL Statements and Deleting in-clause
- Case: Modifying the GUC Parameter rewrite_rule
- Using DN Gather to Reduce Stream Nodes in the Plan
-
SQL Reference
- SQL
- Keywords
- Data Type
- Constant and Macro
-
Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Pattern Matching Operators
- Arithmetic Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions
- Security Functions
- Encrypted Functions and Operators
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
-
System Administration Functions
- Configuration Settings Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- Dual-Cluster DR Control Functions
- Dual-Cluster DR Query Functions
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Undo System Functions
- Other Functions
- SQL Statement Concurrency Control Function
- Statistics Information Functions
- Trigger Functions
- Hash Function
- Prompt Message Function
- Fault Injection System Function
- Redistribution Parameters
- Distribution Key Recommendation Functions
- Other System Functions
- Internal Functions
- AI Feature Functions
- Dynamic Data Masking Functions
- Hotkey Feature Functions
- Global SysCache Functions
- Data Damage Detection and Repair Functions
- Functions of the XML Type
- Functions of the XMLType Type
- Obsolete Functions
- Expressions
- Pseudocolumn
- Type Conversion
- System Operation
- Controlling Transactions
- DDL Syntax Overview
- DML Syntax Overview
- DCL Syntax Overview
-
SQL Syntax
- SQL Syntax
- ABORT
- ALTER AUDIT POLICY
- ALTER COLUMN ENCRYPTION KEY
- ALTER COORDINATOR
- ALTER DATABASE
- ALTER DATABASE LINK
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER FOREIGN DATA WRAPPER
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER NODE
- ALTER NODE GROUP
- ALTER RESOURCE LABEL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLESPACE
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER VIEW
- ANALYZE | ANALYSE
- BEGIN
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- COPY
- CREATE AUDIT POLICY
- CREATE BARRIER
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE CONVERSION
- CREATE DATABASE
- CREATE DATABASE LINK
- CREATE DIRECTORY
- CREATE FOREIGN DATA WRAPPER
- CREATE FUNCTION
- CREATE GLOBAL INDEX
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE NODE
- CREATE NODE GROUP
- CREATE PROCEDURE
- CREATE RESOURCE LABEL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE SCHEMA
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLESPACE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE VIEW
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
- DEALLOCATE
- DECLARE
- DELETE
- DO
- DROP AUDIT POLICY
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATABASE LINK
- DROP DIRECTORY
- DROP FOREIGN DATA WRAPPER
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP NODE
- DROP NODE GROUP
- DROP OWNED
- DROP PROCEDURE
- DROP RESOURCE LABEL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP SCHEMA
- DROP SEQUENCE
- DROP SERVER
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP VIEW
- DROP WEAK PASSWORD DICTIONARY
- EXECUTE
- EXECUTE DIRECT
- EXPDP DATABASE
- EXPDP TABLE
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- IMPDP DATABASE CREATE
- IMPDP RECOVER
- INSERT
- IMPDP TABLE
- IMPDP TABLE PREPARE
- LOCK
- MOVE
- MERGE INTO
- PREDICT BY
- PREPARE
- PREPARE TRANSACTION
- PURGE
- REASSIGN OWNED
- REINDEX
- REFRESH INCREMENTAL MATERIALIZED VIEW
- REFRESH MATERIALIZED VIEW
- RELEASE SAVEPOINT
- RESET
- REVOKE
- ROLLBACK
- ROLLBACK PREPARED
- ROLLBACK TO SAVEPOINT
- SAVEPOINT
- SELECT
- SELECT INTO
- SET
- SET CONSTRAINTS
- SET ROLE
- SET SESSION AUTHORIZATION
- SET TRANSACTION
- SHOW
- SHUTDOWN
- START TRANSACTION
- TIMECAPSULE TABLE
- TRUNCATE
- UPDATE
- VACUUM
- VALUES
- Appendix
- Best Practices
- User-defined Functions
- Stored Procedures
- Autonomous Transaction
-
System Catalogs and System Views
- Overview of System Catalogs and System Views
-
System Catalogs
- GS_AUDITING_POLICY
- GS_AUDITING_POLICY_ACCESS
- GS_AUDITING_POLICY_FILTERS
- GS_AUDITING_POLICY_PRIVILEGES
- GS_ASP
- GS_CLIENT_GLOBAL_KEYS
- GS_CLIENT_GLOBAL_KEYS_ARGS
- GS_COLUMN_KEYS
- GS_COLUMN_KEYS_ARGS
- GS_DATABASE_LINK
- GS_DB_PRIVILEGE
- GS_DEPENDENCIES
- GS_DEPENDENCIES_OBJ
- GS_ENCRYPTED_COLUMNS
- GS_ENCRYPTED_PROC
- GS_GLOBAL_CONFIG
- GS_JOB_ATTRIBUTE
- GS_JOB_ARGUMENT
- GS_MASKING_POLICY
- GS_MASKING_POLICY_ACTIONS
- GS_MASKING_POLICY_FILTERS
- GS_MATVIEW
- GS_MATVIEW_DEPENDENCY
- GS_MODEL_WAREHOUSE
- GS_OPT_MODEL
- GS_PLAN_TRACE
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SQL_PATCH
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WORKLOAD_RULE
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_APP_WORKLOADGROUP_MAPPING
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_AUTHID
- PG_AUTH_HISTORY
- PG_AUTH_MEMBERS
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DB_ROLE_SETTING
- PG_DEFAULT_ACL
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EXTENSION
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PARTITION
- PG_PLTEMPLATE
- PG_PROC
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_RLSPOLICY
- PG_SECLABEL
- PG_SET
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SHSECLABEL
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PG_USER_MAPPING
- PG_USER_STATUS
- PGXC_CLASS
- PGXC_GROUP
- PGXC_NODE
- PGXC_REDISTB
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- STREAMING_STREAM
- STREAMING_CONT_QUERY
-
System Views
- ADM_ARGUMENTS
- ADM_AUDIT_OBJECT
- ADM_AUDIT_SESSION
- ADM_AUDIT_STATEMENT
- ADM_AUDIT_TRAIL
- ADM_COL_COMMENTS
- ADM_COL_PRIVS
- ADM_COLL_TYPES
- ADM_CONS_COLUMNS
- ADM_CONSTRAINTS
- ADM_DATA_FILES
- ADM_DEPENDENCIES
- ADM_DIRECTORIES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_HIST_SQLTEXT
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_IND_PARTITIONS
- ADM_IND_SUBPARTITIONS
- ADM_INDEXES
- ADM_OBJECTS
- ADM_PART_COL_STATISTICS
- ADM_PART_INDEXES
- ADM_PART_TABLES
- ADM_PROCEDURES
- ADM_ROLE_PRIVS
- ADM_ROLES
- ADM_SCHEDULER_JOB_ARGS
- ADM_SCHEDULER_JOBS
- ADM_SCHEDULER_PROGRAM_ARGS
- ADM_SCHEDULER_PROGRAMS
- ADM_SCHEDULER_RUNNING_JOBS
- ADM_SEGMENTS
- ADM_SEQUENCES
- ADM_SOURCE
- ADM_SUBPART_KEY_COLUMNS
- ADM_SYNONYMS
- ADM_SYS_PRIVS
- ADM_TAB_COLS
- ADM_TAB_COL_STATISTICS
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_HISTOGRAMS
- ADM_TAB_PARTITIONS
- ADM_TAB_PRIVS
- ADM_TAB_STATISTICS
- ADM_TAB_STATS_HISTORY
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TRIGGERS
- ADM_TYPES
- ADM_TYPE_ATTRS
- ADM_USERS
- ADM_VIEWS
- COMM_CLIENT_INFO
- DB_ALL_TABLES
- DB_ARGUMENTS
- DB_COL_COMMENTS
- DB_COL_PRIVS
- DB_COLL_TYPES
- DB_CONSTRAINTS
- DB_CONS_COLUMNS
- DB_DEPENDENCIES
- DB_IND_COLUMNS
- DB_IND_EXPRESSIONS
- DB_IND_PARTITIONS
- DB_IND_SUBPARTITIONS
- DB_INDEXES
- DB_OBJECTS
- DB_PART_COL_STATISTICS
- DB_PART_KEY_COLUMNS
- DB_PART_TABLES
- DB_PROCEDURES
- DB_SCHEDULER_JOB_ARGS
- DB_SCHEDULER_PROGRAM_ARGS
- DB_SEQUENCES
- DB_SOURCE
- DB_SUBPART_KEY_COLUMNS
- DB_SYNONYMS
- DB_TAB_COL_STATISTICS
- DB_TAB_COLUMNS
- DB_TAB_COMMENTS
- DB_TAB_HISTOGRAMS
- DB_TAB_PARTITIONS
- DB_TAB_STATS_HISTORY
- DB_TAB_SUBPARTITIONS
- DB_TABLES
- DB_TRIGGERS
- DB_TYPES
- DB_USERS
- DB_VIEWS
- DICT
- DICTIONARY
- DV_SESSIONS
- DV_SESSION_LONGOPS
- GET_GLOBAL_PREPARED_XACTS
- GLOBAL_BAD_BLOCK_INFO
- GLOBAL_CLEAR_BAD_BLOCK_INFO
- GLOBAL_COMM_CLIENT_INFO
- GLOBAL_SQL_PATCH
- GLOBAL_STAT_HOTKEYS_INFO
- GLOBAL_WAL_SENDER_STATUS
- GS_ALL_CONTROL_GROUP_INFO
- GS_ALL_PREPARED_STATEMENTS
- GS_AUDITING
- GS_AUDITING_ACCESS
- GS_AUDITING_PRIVILEGE
- GS_CLUSTER_RESOURCE_INFO
- GS_COMM_LISTEN_ADDRESS_EXT_INFO
- GS_DB_LINKS
- GS_DB_PRIVILEGES
- GS_GET_CONTROL_GROUP_INFO
- GS_GET_LISTEN_ADDRESS_EXT_INFO
- GS_GLOBAL_ARCHIVE_STATUS
- GS_GSC_MEMORY_DETAIL
- GS_LABELS
- GS_LSC_MEMORY_DETAIL
- GS_MASKING
- GS_MATVIEWS
- GS_MY_PLAN_TRACE
- GS_SESSION_ALL_SETTINGS
- GS_SQL_COUNT
- GS_STAT_ALL_PARTITIONS
- GS_STAT_XACT_ALL_PARTITIONS
- GS_STATIO_ALL_PARTITIONS
- GS_WORKLOAD_RULE_STAT
- GV_INSTANCE
- GV_SESSION
- MPP_TABLES
- MY_COL_COMMENTS
- MY_COL_PRIVS
- MY_COLL_TYPES
- MY_CONS_COLUMNS
- MY_CONSTRAINTS
- MY_DEPENDENCIES
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_IND_PARTITIONS
- MY_IND_SUBPARTITIONS
- MY_INDEXES
- MY_JOBS
- MY_OBJECTS
- MY_PART_COL_STATISTICS
- MY_PART_INDEXES
- MY_PART_KEY_COLUMNS
- MY_PART_TABLES
- MY_PROCEDURES
- MY_ROLE_PRIVS
- MY_SCHEDULER_JOB_ARGS
- MY_SCHEDULER_PROGRAM_ARGS
- MY_SEQUENCES
- MY_SOURCE
- MY_SUBPART_KEY_COLUMNS
- MY_SYNONYMS
- MY_SYS_PRIVS
- MY_TAB_COL_STATISTICS
- MY_TAB_COLUMNS
- MY_TAB_COMMENTS
- MY_TAB_HISTOGRAMS
- MY_TAB_PARTITIONS
- MY_TAB_STATISTICS
- MY_TAB_STATS_HISTORY
- MY_TABLES
- MY_TABLESPACES
- MY_TRIGGERS
- MY_TYPE_ATTRS
- MY_TYPES
- MY_VIEWS
- NLS_DATABASE_PARAMETERS
- NLS_INSTANCE_PARAMETERS
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_AVAILABLE_EXTENSIONS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_CONTROL_GROUP_CONFIG
- PG_CURSORS
- PG_EXT_STATS
- PG_GET_INVALID_BACKENDS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_POOLER_STATUS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- PG_SETTINGS
- PG_SHADOW
- PG_SHARED_MEMORY_DETAIL
- PG_STAT_ACTIVITY
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_REPLICATION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATS
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_THREAD_WAIT_STATUS
- PG_TABLES
- PG_TDE_INFO
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_USER
- PG_USER_MAPPINGS
- PG_VARIABLE_INFO
- PG_VIEWS
- PGXC_COMM_DELAY
- PGXC_COMM_RECV_STREAM
- PGXC_COMM_SEND_STREAM
- PGXC_COMM_STATUS
- PGXC_GET_STAT_ALL_TABLES
- PGXC_GET_TABLE_SKEWNESS
- PGXC_NODE_ENV
- PGXC_OS_THREADS
- PGXC_PREPARED_XACTS
- PGXC_RUNNING_XACTS
- PGXC_SQL_COUNT
- PGXC_STAT_ACTIVITY
- PGXC_STAT_BAD_BLOCK
- PGXC_THREAD_WAIT_STATUS
- PGXC_TOTAL_MEMORY_DETAIL
- PGXC_VARIABLE_INFO
- PLAN_TABLE
- PV_FILE_STAT
- PV_INSTANCE_TIME
- PV_OS_RUN_INFO
- PV_REDO_STAT
- PV_SESSION_MEMORY
- PV_SESSION_MEMORY_CONTEXT
- PV_SESSION_MEMORY_DETAIL
- PV_SESSION_STAT
- PV_SESSION_TIME
- PV_THREAD_MEMORY_CONTEXT
- PV_TOTAL_MEMORY_DETAIL
- ROLE_ROLE_PRIVS
- ROLE_SYS_PRIVS
- ROLE_TAB_PRIVS
- SYS_DUMMY
- V_INSTANCE
- V_MYSTAT
- V_SESSION
- V$NLS_PARAMETERS
- V$SESSION_WAIT
- V$SYSSTAT
- V$SYSTEM_EVENT
- V$VERSION
-
Schemas
- Information Schema
-
DBE_PERF Schema
- OS
- Instance
- Memory
- File
-
Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- STAT_BAD_BLOCK
- SUMMARY_STAT_BAD_BLOCK
- GLOBAL_STAT_BAD_BLOCK
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_FUNCTIONS
- GLOBAL_STAT_USER_FUNCTIONS
- Workload
-
Session and Thread
- SESSION_STAT
- GLOBAL_SESSION_STAT
- SESSION_TIME
- GLOBAL_SESSION_TIME
- SESSION_MEMORY
- GLOBAL_SESSION_MEMORY
- SESSION_MEMORY_DETAIL
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT_ACTIVITY
- THREAD_WAIT_STATUS
- GLOBAL_THREAD_WAIT_STATUS
- LOCAL_THREADPOOL_STATUS
- GLOBAL_THREADPOOL_STATUS
- SESSION_CPU_RUNTIME
- SESSION_MEMORY_RUNTIME
- LOCAL_ACTIVE_SESSION
- GLOBAL_ACTIVE_SESSION
- Transaction
- Query
-
Cache and I/O
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_SYS_TABLES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_SEQUENCES
- STATIO_ALL_TABLES
- SUMMARY_STATIO_ALL_TABLES
- GLOBAL_STATIO_ALL_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_ALL_SEQUENCES
- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
- Communication Library
-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- PARALLEL_DECODE_STATUS
- GLOBAL_PARALLEL_DECODE_STATUS
- PARALLEL_DECODE_THREAD_INFO
- GLOBAL_PARALLEL_DECODE_THREAD_INFO
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- POOLER_STATUS
- GLOBAL_COMM_CHECK_CONNECTION_STATUS
- GLOBAL_CKPT_STATUS
- GLOBAL_DOUBLE_WRITE_STATUS
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_POOLER_STATUS
- GLOBAL_RECORD_RESET_TIME
- GLOBAL_REDO_STATUS
- GLOBAL_RECOVERY_STATUS
- CLASS_VITAL_INFO
- USER_LOGIN
- SUMMARY_USER_LOGIN
- GLOBAL_GET_BGWRITER_STATUS
- GLOBAL_SINGLE_FLUSH_DW_STATUS
- GLOBAL_CANDIDATE_STATUS
- Lock
- Wait Event
- Configuration
- Operator
- Workload Manager
- Global Plan Cache
- RTO & RPO
- AI Watchdog
- Discarded
- WDR Snapshot Schema
-
DBE_SQL_UTIL Schema
- DBE_SQL_UTIL.create_hint_sql_patch
- DBE_SQL_UTIL.create_abort_sql_patch
- DBE_SQL_UTIL.drop_sql_patch
- DBE_SQL_UTIL.enable_sql_patch
- DBE_SQL_UTIL.disable_sql_patch
- DBE_SQL_UTIL.show_sql_patch
- DBE_SQL_UTIL.create_hint_sql_patch
- DBE_SQL_UTIL.create_abort_sql_patch
- DBE_SQL_UTIL.create_remote_hint_sql_patch
- DBE_SQL_UTIL.create_remote_abort_sql_patch
- DBE_SQL_UTIL.drop_remote_sql_patch
- DBE_SQL_UTIL.enable_remote_sql_patch
- DBE_SQL_UTIL.disable_remote_sql_patch
-
Configuring Running Parameters
- Viewing Parameters
- Setting Parameters
-
GUC Parameters
- GUC Parameter Usage
- File Location
- Connection and Authentication
- Resource Consumption
- Parallel Data Import
- Write Ahead Log
- HA Replication
- Query Planning
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Automatic Vacuuming
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Fault Tolerance
- Connection Pool Parameters
- Cluster Transaction Parameters
- Dual-Cluster Replication Parameters
- Developer Options
- Auditing
- Transaction Monitoring
- CM Parameters
- GTM Parameters
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Event
- Query
- System Performance Snapshot
- Security Configuration
- HyperLogLog
- User-defined Functions
- Collaborative Analysis
- Acceleration Cluster
- Scheduled Task
- Thread Pool
- Full Text Search
- Backup and Restoration
- AI Features
- Global SysCache Parameters
- Reserved Parameters
- Read Parameters of the Standby Node in a Distributed System
- Restoring Data on the Standby Node
- Undo
- Rollback Parameters
- DCF Parameters Settings
- Flashback
-
Developer Guide(Centralized_3.x)
- Database System Overview
- Database Security
- Database Quick Start
- Development and Design Proposal
-
Application Development Guide
- Development Specifications
- Obtaining the Driver Package
-
Development Based on JDBC
- JDBC Package, Driver Class, and Environment Class
- Development Process
- Loading a Driver
- Connecting to a Database
- Connecting to a Database (Using SSL)
- Connecting to a Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Connection
- Log Management
- Examples: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Importing and Exporting Data Through Local Files
- Example: Migrating Data from MY
- Example: Logical Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
-
JDBC API Reference
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- PGReplicationConnection
- PGReplicationStream
- ChainedStreamBuilder
- ChainedCommonStreamBuilder
- PGobject
- Common JDBC Parameters
- Troubleshooting
- Mapping for JDBC Data Types
- Development Based on ODBC
- Development Based on libpq
- Psycopg-based Development
- Development Based on the Go Driver
-
ECPG-based Development
- Development Process
- ecpg Components
- ecpg Preprocessing and Compiling
- Managing Database Connections
- Running SQL Commands
- Querying the Result Set
- Closing a Database Connection
- Host Variables
- Executing Dynamic SQL Statements
- Error Handling
- Preprocessor Directives
- Using Library Functions
- SQL Descriptor Area
- Examples
- ECPG API Reference
- Debugging
-
SQL Optimization
- Query Execution Process
- Introduction to the SQL Execution Plan
- Optimization Process
- Updating Statistics
- Reviewing and Modifying a Table Definition
- Typical SQL Optimization Methods
- Experience in Rewriting SQL Statements
- Configuring Key Parameters for SQL Tuning
-
Hint-based Tuning
- Plan Hint Optimization
- Hint Specifying the Query Block Where the Hint Is Located
- Hint Specifying the Query Block and Schema of a Table
- Join Order Hints
- Join Operation Hints
- Rows Hints
- Stream Operation Hints
- Scan Operation Hints
- Sublink Name Hints
- Hint Errors, Conflicts, and Other Warnings
- Optimizer GUC Parameter Hints
- Hint for Selecting the Custom Plan or Generic Plan
- Hints Specifying Not to Expand Subqueries
- Hint Specifying Not to Use Global Plan Cache
- Hint of Parameterized Paths at the Same Level
- Hint for Setting Slow SQL Control Rules
- Hint for Adaptive Plan Selection
- Hint for Materializing a Sub-plan Result
- Bitmap Scan Hints
- Hint for Inner Table Materialization During Join
- AGG Hint
- Introduction to Plan Trace
- Tuning with SQL PATCH
- Optimization Cases
-
SQL Reference
- SQL
- Keywords
- Data Types
- Constant and Macro
-
Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Pattern Matching Operators
- Arithmetic Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions
- Security Functions
- Encrypted Functions and Operators
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
-
System Administration Functions
- Configuration Settings Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- DR Control Functions for Dual-Database Instances
- DR Query Functions for Dual-Database Instances
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Other Functions
- Undo System Functions
- SQL Statement Concurrency Control Function
- Statistics Information Functions
- Trigger Functions
- Hash Function
- Prompt Message Function
- Global Temporary Table Functions
- Fault Injection System Function
- AI Feature Functions
- Dynamic Data Masking Functions
- Hierarchical Recursion Query Functions
- Other System Functions
- Internal Functions
- Global SysCache Functions
- Data Damage Detection and Repair Functions
- Functions of the XML Type
- Functions of the XMLType Type
- Global PL/SQL Cache Functions
- Obsolete Functions
- Expressions
- Pseudocolumn
- Type Conversion
- System Operation
- Controlling Transactions
- DDL Syntax Overview
- DML Syntax Overview
- DCL Syntax Overview
-
SQL Syntax
- SQL Syntax
- ABORT
- ALTER AGGREGATE
- ALTER AUDIT POLICY
- ALTER COLUMN ENCRYPTION KEY
- ALTER EVENT
- ALTER DATABASE
- ALTER DATABASE LINK
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER FOREIGN DATA WRAPPER
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER OPERATOR
- ALTER PACKAGE
- ALTER PROCEDURE
- ALTER RESOURCE LABEL
- ALTER RESOURCE POOL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLE SUBPARTITION
- ALTER TABLESPACE
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER USER MAPPING
- ALTER VIEW
- ANALYZE | ANALYSE
- BEGIN
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- COPY
- CREATE AGGREGATE
- CREATE AUDIT POLICY
- CREATE CAST
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE CONVERSION
- CREATE DATABASE
- CREATE DATABASE LINK
- CREATE DIRECTORY
- CREATE EVENT
- CREATE FOREIGN DATA WRAPPER
- CREATE FUNCTION
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE OPERATOR
- CREATE OPERATOR CLASS
- CREATE PACKAGE
- CREATE PROCEDURE
- CREATE RESOURCE LABEL
- CREATE RESOURCE POOL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE RULE
- CREATE SCHEMA
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TABLESPACE
- CREATE TABLE SUBPARTITION
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE USER MAPPING
- CREATE VIEW
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
- DEALLOCATE
- DECLARE
- DELETE
- DO
- DROP AGGREGATE
- DROP AUDIT POLICY
- DROP CAST
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATABASE LINK
- DROP DIRECTORY
- DROP EVENT
- DROP FOREIGN DATA WRAPPER
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP OPERATOR
- DROP OWNED
- DROP PACKAGE
- DROP PROCEDURE
- DROP RESOURCE LABEL
- DROP RESOURCE POOL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP RULE
- DROP SCHEMA
- DROP SEQUENCE
- DROP SERVER
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP USER MAPPING
- DROP VIEW
- DROP WEAK PASSWORD DICTIONARY
- EXECUTE
- EXPDP DATABASE
- EXPDP TABLE
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- IMPDP DATABASE CREATE
- IMPDP RECOVER
- IMPDP TABLE
- IMPDP TABLE PREPARE
- INSERT
- LOCK
- MERGE INTO
- MOVE
- PREDICT BY
- PREPARE
- PREPARE TRANSACTION
- PURGE
- REASSIGN OWNED
- REFRESH INCREMENTAL MATERIALIZED VIEW
- REFRESH MATERIALIZED VIEW
- REINDEX
- RELEASE SAVEPOINT
- RESET
- REVOKE
- ROLLBACK
- ROLLBACK PREPARED
- ROLLBACK TO SAVEPOINT
- SAVEPOINT
- SELECT
- SELECT INTO
- SET
- SET CONSTRAINTS
- SET ROLE
- SET SESSION AUTHORIZATION
- SET TRANSACTION
- SHOW
- SHOW EVENTS
- SHUTDOWN
- SNAPSHOT
- START TRANSACTION
- TIMECAPSULE TABLE
- TRUNCATE
- UPDATE
- VACUUM
- VALUES
- ALTER EXTENSION
- CREATE EXTENSION
- DROP EXTENSION
- Appendix
- Best Practices
- User-defined Functions
- Stored Procedure
- Autonomous Transaction
-
System Catalogs and System Views
- Overview of System Catalogs and System Views
-
System Catalogs
- GS_ASP
- GS_AUDITING_POLICY
- GS_AUDITING_POLICY_ACCESS
- GS_AUDITING_POLICY_FILTERS
- GS_AUDITING_POLICY_PRIVILEGES
- GS_CLIENT_GLOBAL_KEYS
- GS_CLIENT_GLOBAL_KEYS_ARGS
- GS_COLUMN_KEYS
- GS_COLUMN_KEYS_ARGS
- GS_DATABASE_LINK
- GS_DB_PRIVILEGE
- GS_DEPENDENCIES
- GS_DEPENDENCIES_OBJ
- GS_ENCRYPTED_COLUMNS
- GS_ENCRYPTED_PROC
- GS_GLOBAL_CONFIG
- GS_JOB_ARGUMENT
- GS_JOB_ATTRIBUTE
- GS_MASKING_POLICY
- GS_MASKING_POLICY_ACTIONS
- GS_MASKING_POLICY_FILTERS
- GS_MATVIEW
- GS_MATVIEW_DEPENDENCY
- GS_MODEL_WAREHOUSE
- GS_OPT_MODEL
- GS_PACKAGE
- GS_PLAN_TRACE
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SQL_PATCH
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WORKLOAD_RULE
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_APP_WORKLOADGROUP_MAPPING
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_AUTHID
- PG_AUTH_HISTORY
- PG_AUTH_MEMBERS
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DB_ROLE_SETTING
- PG_DEFAULT_ACL
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EXTENSION
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PARTITION
- PG_PLTEMPLATE
- PG_PROC
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_RLSPOLICY
- PG_SECLABEL
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SHSECLABEL
- PG_SET
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PG_USER_MAPPING
- PG_USER_STATUS
- PGXC_CLASS
- PGXC_GROUP
- PGXC_NODE
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- STREAMING_STREAM
- STREAMING_CONT_QUERY
-
System Views
- ADM_ARGUMENTS
- ADM_AUDIT_OBJECT
- ADM_AUDIT_SESSION
- ADM_AUDIT_STATEMENT
- ADM_AUDIT_TRAIL
- ADM_COL_COMMENTS
- ADM_COL_PRIVS
- ADM_COLL_TYPES
- ADM_CONS_COLUMNS
- ADM_CONSTRAINTS
- ADM_DATA_FILES
- ADM_DEPENDENCIES
- ADM_DIRECTORIES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_HIST_SQLTEXT
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_IND_PARTITIONS
- ADM_IND_SUBPARTITIONS
- ADM_INDEXES
- ADM_OBJECTS
- ADM_PART_COL_STATISTICS
- ADM_PART_INDEXES
- ADM_PART_TABLES
- ADM_PROCEDURES
- ADM_RECYCLEBIN
- ADM_ROLE_PRIVS
- ADM_ROLES
- ADM_SCHEDULER_JOB_ARGS
- ADM_SCHEDULER_JOBS
- ADM_SCHEDULER_PROGRAM_ARGS
- ADM_SCHEDULER_PROGRAMS
- ADM_SCHEDULER_RUNNING_JOBS
- ADM_SEGMENTS
- ADM_SEQUENCES
- ADM_SOURCE
- ADM_SUBPART_COL_STATISTICS
- ADM_SUBPART_KEY_COLUMNS
- ADM_SYNONYMS
- ADM_SYS_PRIVS
- ADM_TAB_COL_STATISTICS
- ADM_TAB_COLS
- ADM_TAB_HISTOGRAMS
- ADM_TAB_PRIVS
- ADM_TAB_STATISTICS
- ADM_TAB_STATS_HISTORY
- ADM_TAB_SUBPARTITIONS
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_PARTITIONS
- ADM_TRIGGERS
- ADM_TYPE_ATTRS
- ADM_TYPES
- ADM_USERS
- ADM_VIEWS
- DB_ALL_TABLES
- DB_ARGUMENTS
- DB_COL_COMMENTS
- DB_COL_PRIVS
- DB_COLL_TYPES
- DB_CONS_COLUMNS
- DB_CONSTRAINTS
- DB_DEPENDENCIES
- DB_ERRORS
- DB_IND_COLUMNS
- DB_IND_EXPRESSIONS
- DB_IND_PARTITIONS
- DB_IND_SUBPARTITIONS
- DB_INDEXES
- DB_OBJECTS
- DB_PART_COL_STATISTICS
- DB_PART_INDEXES
- DB_PART_KEY_COLUMNS
- DB_PART_TABLES
- DB_PROCEDURES
- DB_SCHEDULER_JOB_ARGS
- DB_SCHEDULER_PROGRAM_ARGS
- DB_SEQUENCES
- DB_SOURCE
- DB_SUBPART_COL_STATISTICS
- DB_SUBPART_KEY_COLUMNS
- DB_SYNONYMS
- DB_TAB_COL_STATISTICS
- DB_TAB_COLUMNS
- DB_TAB_COMMENTS
- DB_TAB_HISTOGRAMS
- DB_TAB_PARTITIONS
- DB_TAB_STATS_HISTORY
- DB_TAB_SUBPARTITIONS
- DB_TABLES
- DB_TRIGGERS
- DB_TYPES
- DB_USERS
- DB_VIEWS
- DICT
- DICTIONARY
- DV_SESSION_LONGOPS
- DV_SESSIONS
- GS_ALL_CONTROL_GROUP_INFO
- GS_ALL_PREPARED_STATEMENTS
- GS_AUDITING
- GS_AUDITING_ACCESS
- GS_AUDITING_PRIVILEGE
- GS_CLUSTER_RESOURCE_INFO
- GS_COMM_LISTEN_ADDRESS_EXT_INFO
- GS_COMM_PROXY_THREAD_STATUS
- GS_DB_LINKS
- GS_DB_PRIVILEGES
- GS_FILE_STAT
- GS_GET_CONTROL_GROUP_INFO
- GS_GET_LISTEN_ADDRESS_EXT_INFO
- GS_GLC_MEMORY_DETAIL
- GS_GLOBAL_ARCHIVE_STATUS
- GS_GSC_MEMORY_DETAIL
- GS_INSTANCE_TIME
- GS_LABELS
- GS_LSC_MEMORY_DETAIL
- GS_MASKING
- GS_MATVIEWS
- GS_MY_PLAN_TRACE
- GS_OS_RUN_INFO
- GS_REDO_STAT
- GS_SESSION_ALL_SETTINGS
- GS_SESSION_MEMORY
- GS_SESSION_MEMORY_CONTEXT
- GS_SESSION_MEMORY_DETAIL
- GS_SESSION_STAT
- GS_SESSION_TIME
- GS_SQL_COUNT
- GS_STAT_ALL_PARTITIONS
- GS_STAT_XACT_ALL_PARTITIONS
- GS_STATIO_ALL_PARTITIONS
- GS_THREAD_MEMORY_CONTEXT
- GS_TOTAL_MEMORY_DETAIL
- GS_TOTAL_NODEGROUP_MEMORY_DETAIL
- GS_WLM_WORKLOAD_RECORDS
- GS_WORKLOAD_RULE_STAT
- GV_INSTANCE
- GV_SESSION
- MPP_TABLES
- MY_COL_COMMENTS
- MY_COL_PRIVS
- MY_COLL_TYPES
- MY_CONS_COLUMNS
- MY_CONSTRAINTS
- MY_DEPENDENCIES
- MY_ERRORS
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_IND_PARTITIONS
- MY_IND_SUBPARTITIONS
- MY_INDEXES
- MY_JOBS
- MY_OBJECTS
- MY_PART_COL_STATISTICS
- MY_PART_INDEXES
- MY_PART_KEY_COLUMNS
- MY_PART_TABLES
- MY_PROCEDURES
- MY_RECYCLEBIN
- MY_ROLE_PRIVS
- MY_SCHEDULER_JOB_ARGS
- MY_SCHEDULER_PROGRAM_ARGS
- MY_SEQUENCES
- MY_SOURCE
- MY_SUBPART_COL_STATISTICS
- MY_SUBPART_KEY_COLUMNS
- MY_SYNONYMS
- MY_SYS_PRIVS
- MY_TAB_COL_STATISTICS
- MY_TAB_COLUMNS
- MY_TAB_COMMENTS
- MY_TAB_HISTOGRAMS
- MY_TAB_PARTITIONS
- MY_TAB_STATISTICS
- MY_TAB_STATS_HISTORY
- MY_TAB_SUBPARTITIONS
- MY_TABLES
- MY_TABLESPACES
- MY_TRIGGERS
- MY_TYPE_ATTRS
- MY_TYPES
- MY_VIEWS
- NLS_DATABASE_PARAMETERS
- NLS_INSTANCE_PARAMETERS
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_AVAILABLE_EXTENSIONS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_CONTROL_GROUP_CONFIG
- PG_CURSORS
- PG_EXT_STATS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_GTT_ATTACHED_PIDS
- PG_GTT_RELSTATS
- PG_GTT_STATS
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_REPLICATION_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- PG_SETTINGS
- PG_SHADOW
- PG_STAT_ACTIVITY
- PG_STAT_ACTIVITY_NG
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_REPLICATION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATS
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_TABLES
- PG_TDE_INFO
- PG_THREAD_WAIT_STATUS
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_USER
- PG_USER_MAPPINGS
- PG_VARIABLE_INFO
- PG_VIEWS
- PGXC_PREPARED_XACTS
- PGXC_THREAD_WAIT_STATUS
- PLAN_TABLE
- ROLE_ROLE_PRIVS
- ROLE_SYS_PRIVS
- ROLE_TAB_PRIVS
- SYS_DUMMY
- V_INSTANCE
- V_MYSTAT
- V_SESSION
- V$GLOBAL_TRANSACTION
- V$NLS_PARAMETERS
- V$SESSION_WAIT
- V$SYSSTAT
- V$SYSTEM_EVENT
- V$VERSION
- Discarded
-
Schemas
- Information Schema
-
DBE_PERF Schema
- OS
- Instance
- Memory
- File
-
Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- STAT_BAD_BLOCK
- SUMMARY_STAT_BAD_BLOCK
- GLOBAL_STAT_BAD_BLOCK
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_FUNCTIONS
- GLOBAL_STAT_USER_FUNCTIONS
- Workload
-
Session/Thread
- SESSION_STAT
- GLOBAL_SESSION_STAT
- SESSION_TIME
- GLOBAL_SESSION_TIME
- SESSION_MEMORY
- GLOBAL_SESSION_MEMORY
- SESSION_MEMORY_DETAIL
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT_ACTIVITY
- THREAD_WAIT_STATUS
- GLOBAL_THREAD_WAIT_STATUS
- LOCAL_THREADPOOL_STATUS
- GLOBAL_THREADPOOL_STATUS
- LOCAL_ACTIVE_SESSION
- Transaction
- Query
-
Cache/IO
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_SYS_TABLES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_SEQUENCES
- STATIO_ALL_TABLES
- SUMMARY_STATIO_ALL_TABLES
- GLOBAL_STATIO_ALL_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_ALL_SEQUENCES
- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- GLOBAL_CKPT_STATUS
- GLOBAL_DOUBLE_WRITE_STATUS
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_RECORD_RESET_TIME
- GLOBAL_REDO_STATUS
- GLOBAL_RECOVERY_STATUS
- CLASS_VITAL_INFO
- USER_LOGIN
- SUMMARY_USER_LOGIN
- GLOBAL_SINGLE_FLUSH_DW_STATUS
- GLOBAL_CANDIDATE_STATUS
- PARALLEL_DECODE_STATUS
- GLOBAL_PARALLEL_DECODE_STATUS
- PARALLEL_DECODE_THREAD_INFO
- GLOBAL_PARALLEL_DECODE_THREAD_INFO
- Lock
- Wait Events
- Configuration
- Operator
- Workload Manager
- Global Plancache
- RTO & RPO
- AI Watchdog
- Discarded
- WDR Snapshot Schema
-
DBE_PLDEBUGGER Schema
- DBE_PLDEBUGGER.turn_on
- DBE_PLDEBUGGER.turn_off
- DBE_PLDEBUGGER.local_debug_server_info
- DBE_PLDEBUGGER.attach
- DBE_PLDEBUGGER.info_locals
- DBE_PLDEBUGGER.next
- DBE_PLDEBUGGER.continue
- DBE_PLDEBUGGER.abort
- DBE_PLDEBUGGER.print_var
- DBE_PLDEBUGGER.info_code
- DBE_PLDEBUGGER.step
- DBE_PLDEBUGGER.add_breakpoint
- DBE_PLDEBUGGER.delete_breakpoint
- DBE_PLDEBUGGER.info_breakpoints
- DBE_PLDEBUGGER.backtrace
- DBE_PLDEBUGGER.enable_breakpoint
- DBE_PLDEBUGGER.disable_breakpoint
- DBE_PLDEBUGGER.finish
- DBE_PLDEBUGGER.set_var
- DB4AI Schema
- DBE_PLDEVELOPER
- DBE_SQL_UTIL Schema
-
Configuring Running Parameters
- Viewing Parameters
- Setting Parameters
-
GUC Parameters
- GUC Parameter Usage
- File Location
- Connection and Authentication
- Resource Consumption
- Data Import and Export
- Write Ahead Log
- HA Replication
- Query Planning
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Automatic Vacuuming
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Fault Tolerance
- Connection Pool Parameters
- Transaction
- Replication Parameters of Two Database Instances
- Developer Options
- Auditing
- CM Parameters
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Events
- Query
- System Performance Snapshot
- Security Configuration
- Global Temporary Table
- HyperLogLog
- User-defined Functions
- Scheduled Task
- Thread Pool
- Backup and Restoration
- Undo
- DCF Parameters Settings
- Flashback
- Rollback Parameters
- Reserved Parameters
- AI Features
- Global SysCache Parameters
- Parameters Related to the Efficient Data Compression Algorithm
- Restoring Data on the Standby Node
- Delimiter
- Global PL/SQL Cache Parameters
-
Developer Guide(Distributed_2.x)
- Overview
- Working with Databases
- Development and Design Proposal
- Best Practices
-
Tutorial: Using GDS to Import Data from a Remote Server
- Overview
- Prerequisites
- Step 1: Preparing Source Data
- Step 2: Installing, Configuring, and Starting GDS on a Data Server
- Step 3: Creating a Foreign Table in GaussDB
- Step 4: Importing Data to GaussDB
- Step 5: Analyzing and Handling Import Errors
- Step 6: Improving Query Efficiency After Data Import
- Step 7: Stopping GDS
- Step 8: Cleaning Up Resources
-
Application Development Guide
- Development Specifications
- Obtaining the Driver Package
-
Development Based on JDBC
- JDBC Package, Driver Class, and Environment Class
- Development Process
- Loading a Driver
- Connecting to a Database
- Connecting to the Database (Using SSL)
- Connecting to a Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Connection
- Log Management
- Example: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Importing and Exporting Data Through Local Files
- Example: Migrating Data from MySQL
- Example: Logic Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
- JDBC Interface Reference
- Development Based on ODBC
- Development Based on libpq
- Psycopg-based Development
- Database Security Management
-
Importing Data
- Importing Data in Parallel Using Foreign Tables
- Running the INSERT Statement to Insert Data
- Running the COPY FROM STDIN Statement to Import Data
- Using a gsql Meta-Command to Import Data
- Updating Data in a Table
- Deep Copy
- Checking for Data Skew
- Analyzing Tables
- Doing VACUUM to a Table
- Managing Concurrent Write Operations
- Exporting Data
-
Performance Tuning
- Overview
- Determining the Scope of Performance Tuning
-
SQL Optimization
- Query Execution Process
- Introduction to the SQL Execution Plan
- Optimization Process
- Updating Statistics
- Reviewing and Modifying a Table Definition
- Typical SQL Optimization Methods
- Experience in Rewriting SQL Statements
- Configuring Key Parameters for SQL Tuning
-
Hint-based Tuning
- Plan Hint Optimization
- Join Order Hints
- Join Operation Hints
- Rows Hints
- Stream Operation Hints
- Scan Operation Hints
- Sublink Name Hints
- Skew Hints
- Parameterized Path Hint
- Hint Errors, Conflicts, and Other Warnings
- Plan Hint Cases
- Optimizer GUC Parameter Hints
- Hints for Selecting the Custom Plan or Generic Plan
- Hints Specifying Not to Expand Subqueries
- Hints Specifying Not to Use Global Plan Cache
- Hint of Parameterized Paths at the Same Level
- Checking the Implicit Conversion Performance
- Using the Vectorized Executor for Tuning
-
Optimization Cases
- Case: Selecting an Appropriate Distribution Key
- Case: Creating an Appropriate Index
- Case: Adding NOT NULL for JOIN Columns
- Case: Pushing Down Sort Operations to DNs
- Case: Setting cost_param and Optimizing Query Performance
- Case: Adjusting Distribution Keys
- Case: Adjusting Partial Clustering Keys
- Case: Adjusting the Table Storage Model in a Medium Table
- Case: Adjusting Partial Clustering Keys
- Case: Modifying a Partitioned Table
- Case: Adjusting the GUC Parameter best_agg_plan
- Case: Rewriting SQL and Deleting Subqueries (1)
- Case: Rewriting SQL and Deleting Subqueries (2)
- Case: Rewriting SQL Statements to Eliminate Pruning Interference
- Case: Rewriting SQL Statements and Deleting in-clause
- Case: Setting Partial Cluster Keys
- Case: Modifying the GUC Parameter rewrite_rule
- Case: Using DN Gather to Reduce Stream Nodes in the Plan
- Case: Adjusting I/O Parameters to Reduce the Log Bloat Rate
- Configuring Running Parameters
-
SQL Reference
- GaussDB SQL
- Keywords
-
Data Type
- Numeric Types
- Monetary Types
- Boolean Types
- Character Types
- Binary Types
- Date/Time Types
- Geometric Types
- Network Address Types
- Bit String Types
- Text Search Types
- UUID Type
- JSON/JSONB Types
- HLL
- Range
- Object Identifier Types
- Pseudo-Types
- Data Types Supported by Column-store Tables
- Data Types Used by the Ledger Database
- ACLItem
- Constant and Macro
-
Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Pattern Matching Operators
- Arithmetic Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions
- Security Functions
- Ledger Database Functions
- Encrypted Equality Functions
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
-
System Administration Functions
- Configuration Settings Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- Dual-Cluster DR Control Functions
- Dual-Cluster DR Query Functions
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Segment-Page Storage Functions
- Other Functions
- Statistics Information Functions
- Trigger Functions
- Hash Function
- Prompt Message Function
- Fault Injection System Function
- Redistribution Parameters
- Distribution Column Recommendation Functions
- Other System Functions
- Internal Functions
- AI Feature Functions
- Dynamic Data Masking Functions
- Hotkey Feature Functions
- Global SysCache Functions
- Data Damage Detection and Repair Functions
- Obsolete Functions
- Expressions
- Type Conversion
- Full Text Search
- System Operation
- Controlling Transactions
- DDL Syntax Overview
- DML Syntax Overview
- DCL Syntax Overview
-
SQL Syntax
- ABORT
- ALTER APP WORKLOAD GROUP MAPPING
- ALTER AUDIT POLICY
- ALTER COORDINATOR
- ALTER DATABASE
- ALTER DATA SOURCE
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER FOREIGN TABLE (for Import and Export)
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER LARGE OBJECT
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER NODE
- ALTER NODE GROUP
- ALTER RESOURCE LABEL
- ALTER RESOURCE POOL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLESPACE
- ALTER TEXT SEARCH CONFIGURATION
- ALTER TEXT SEARCH DICTIONARY
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER VIEW
- ALTER WORKLOAD GROUP
- ANALYZE | ANALYSE
- BEGIN
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- COPY
- CREATE APP WORKLOAD GROUP MAPPING
- CREATE AUDIT POLICY
- CREATE BARRIER
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE CONVERSION
- CREATE DATABASE
- CREATE DATA SOURCE
- CREATE DIRECTORY
- CREATE FOREIGN TABLE (for Import and Export)
- CREATE FUNCTION
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE NODE
- CREATE NODE GROUP
- CREATE PROCEDURE
- CREATE RESOURCE LABEL
- CREATE RESOURCE POOL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE SCHEMA
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLESPACE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TEXT SEARCH CONFIGURATION
- CREATE TEXT SEARCH DICTIONARY
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE VIEW
- CREATE WORKLOAD GROUP
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
- DEALLOCATE
- DECLARE
- DELETE
- DO
- DROP APP WORKLOAD GROUP MAPPING
- DROP AUDIT POLICY
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATA SOURCE
- DROP DIRECTORY
- DROP FOREIGN TABLE
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP NODE
- DROP NODE GROUP
- DROP OWNED
- DROP PROCEDURE
- DROP RESOURCE LABEL
- DROP RESOURCE POOL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP SCHEMA
- DROP SEQUENCE
- DROP SERVER
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TEXT SEARCH CONFIGURATION
- DROP TEXT SEARCH DICTIONARY
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP VIEW
- DROP WORKLOAD GROUP
- DROP WEAK PASSWORD DICTIONARY
- EXECUTE
- EXECUTE DIRECT
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- INSERT
- LOCK
- MOVE
- MERGE INTO
- PREDICT BY
- PREPARE
- PREPARE TRANSACTION
- REASSIGN OWNED
- REINDEX
- REFRESH INCREMENTAL MATERIALIZED VIEW
- REFRESH MATERIALIZED VIEW
- RELEASE SAVEPOINT
- RESET
- REVOKE
- ROLLBACK
- ROLLBACK PREPARED
- ROLLBACK TO SAVEPOINT
- SAVEPOINT
- SELECT
- SELECT INTO
- SET
- SET CONSTRAINTS
- SET ROLE
- SET SESSION AUTHORIZATION
- SET TRANSACTION
- SHOW
- SHUTDOWN
- START TRANSACTION
- TRUNCATE
- UPDATE
- VACUUM
- VALUES
- Appendix
- Stored Procedures
- Autonomous Transaction
-
System Catalogs and System Views
- Overview of System Catalogs and System Views
-
System Catalogs
- GS_AUDITING_POLICY
- GS_AUDITING_POLICY_ACCESS
- GS_AUDITING_POLICY_FILTERS
- GS_AUDITING_POLICY_PRIVILEGES
- GS_ASP
- GS_CLIENT_GLOBAL_KEYS
- GS_CLIENT_GLOBAL_KEYS_ARGS
- GS_COLUMN_KEYS
- GS_COLUMN_KEYS_ARGS
- GS_DB_PRIVILEGE
- GS_ENCRYPTED_COLUMNS
- GS_ENCRYPTED_PROC
- GS_GLOBAL_CHAIN
- GS_GLOBAL_CONFIG
- GS_JOB_ATTRIBUTE
- GS_JOB_ARGUMENT
- GS_MASKING_POLICY
- GS_MASKING_POLICY_ACTIONS
- GS_MASKING_POLICY_FILTERS
- GS_MATVIEW
- GS_MATVIEW_DEPENDENCY
- GS_MODEL_WAREHOUSE
- GS_OBSSCANINFO
- GS_OPT_MODEL
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SQL_PATCH
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WLM_EC_OPERATOR_INFO
- GS_WLM_INSTANCE_HISTORY
- GS_WLM_OPERATOR_INFO
- GS_WLM_SESSION_QUERY_INFO_ALL
- GS_WLM_USER_RESOURCE_HISTORY
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_APP_WORKLOADGROUP_MAPPING
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_AUTHID
- PG_AUTH_HISTORY
- PG_AUTH_MEMBERS
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DB_ROLE_SETTING
- PG_DEFAULT_ACL
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EXTENSION
- PG_EXTENSION_DATA_SOURCE
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_FOREIGN_TABLE
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OBSSCANINFO
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PARTITION
- PG_PLTEMPLATE
- PG_PROC
- PG_PUBLICATION
- PG_PUBLICATION_REL
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_RLSPOLICY
- PG_SECLABEL
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SHSECLABEL
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SUBSCRIPTION
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PG_USER_MAPPING
- PG_USER_STATUS
- PG_WORKLOAD_GROUP
- PGXC_CLASS
- PGXC_GROUP
- PGXC_NODE
- PGXC_REDISTB
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- STREAMING_STREAM
- STREAMING_CONT_QUERY
- STREAMING_REAPER_STATUS
-
System Views
- ADM_COL_COMMENTS
- ADM_CONS_COLUMNS
- ADM_CONSTRAINTS
- ADM_DATA_FILES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_INDEXES
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_IND_PARTITIONS
- ADM_OBJECTS
- ADM_PART_INDEXES
- ADM_PART_TABLES
- ADM_PROCEDURES
- ADM_SEQUENCES
- ADM_SCHEDULER_JOBS
- ADM_SOURCE
- ADM_SYNONYMS
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_PARTITIONS
- ADM_TRIGGERS
- ADM_TYPE_ATTRS
- ADM_USERS
- ADM_VIEWS
- COMM_CLIENT_INFO
- DB_ALL_TABLES
- DB_CONSTRAINTS
- DB_CONS_COLUMNS
- DB_DEPENDENCIES
- DB_IND_COLUMNS
- DB_IND_EXPRESSIONS
- DB_INDEXES
- DB_OBJECTS
- DB_PROCEDURES
- DB_SEQUENCES
- DB_SOURCE
- DB_SYNONYMS
- DB_TAB_COLUMNS
- DB_TAB_COMMENTS
- DB_COL_COMMENTS
- DB_TABLES
- DB_TRIGGERS
- DB_USERS
- DB_VIEWS
- DV_SESSIONS
- DV_SESSION_LONGOPS
- GET_GLOBAL_PREPARED_XACTS
- GLOBAL_BAD_BLOCK_INFO
- GLOBAL_CLEAR_BAD_BLOCK_INFO
- GLOBAL_COMM_CLIENT_INFO
- GLOBAL_STAT_HOTKEYS_INFO
- GLOBAL_WAL_SENDER_STATUS
- GS_ALL_CONTROL_GROUP_INFO
- GS_AUDITING
- GS_AUDITING_ACCESS
- GS_AUDITING_PRIVILEGE
- GS_CLUSTER_RESOURCE_INFO
- GS_DB_PRIVILEGES
- GS_GET_CONTROL_GROUP_INFO
- GS_GSC_MEMORY_DETAIL
- GS_LABELS
- GS_LSC_MEMORY_DETAIL
- GS_MASKING
- GS_MATVIEWS
- GS_MATVIEWS
- GS_SESSION_CPU_STATISTICS
- GS_SESSION_MEMORY_STATISTICS
- GS_SQL_COUNT
- GS_STAT_DB_CU
- GS_STAT_SESSION_CU
- GS_TOTAL_NODEGROUP_MEMORY_DETAIL
- GS_WLM_CGROUP_INFO
- GS_WLM_EC_OPERATOR_STATISTICS
- GS_WLM_EC_OPERATOR_HISTORY
- GS_WLM_OPERATOR_HISTORY
- GS_WLM_OPERATOR_STATISTICS
- GS_WLM_REBUILD_USER_RESOURCE_POOL
- GS_WLM_RESOURCE_POOL
- GS_WLM_SESSION_HISTORY
- GS_WLM_SESSION_INFO
- GS_WLM_SESSION_INFO_ALL
- GS_WLM_USER_INFO
- GS_WLM_USER_SESSION_INFO
- GS_WLM_SESSION_STATISTICS
- GS_WLM_WORKLOAD_RECORDS
- GV_SESSION
- MPP_TABLES
- MY_COL_COMMENTS
- MY_CONS_COLUMNS
- MY_CONSTRAINTS
- MY_INDEXES
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_IND_PARTITIONS
- MY_JOBS
- MY_OBJECTS
- MY_PART_INDEXES
- MY_PART_TABLES
- MY_PROCEDURES
- MY_SEQUENCES
- MY_SOURCE
- MY_SYNONYMS
- MY_TAB_COLUMNS
- MY_TAB_COMMENTS
- MY_TAB_PARTITIONS
- MY_TABLES
- MY_TRIGGERS
- MY_VIEWS
- PG_AVAILABLE_EXTENSIONS
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_CONTROL_GROUP_CONFIG
- PG_CURSORS
- PG_EXT_STATS
- PG_GET_INVALID_BACKENDS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_POOLER_STATUS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_PUBLICATION_TABLES
- PG_REPLICATION_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- PG_SESSION_IOSTAT
- PG_SESSION_WLMSTAT
- PG_SETTINGS
- PG_SHADOW
- PG_SHARED_MEMORY_DETAIL
- PG_STATS
- PG_STAT_ACTIVITY
- PG_STAT_ACTIVITY_NG
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_REPLICATION
- PG_STAT_SUBSCRIPTION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_THREAD_WAIT_STATUS
- PG_TABLES
- PG_TDE_INFO
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_USER
- PG_USER_MAPPINGS
- PG_VARIABLE_INFO
- PG_VIEWS
- PG_WLM_STATISTICS
- PGXC_COMM_DELAY
- PGXC_COMM_RECV_STREAM
- PGXC_COMM_SEND_STREAM
- PGXC_COMM_STATUS
- PGXC_GET_STAT_ALL_TABLES
- PGXC_GET_TABLE_SKEWNESS
- PGXC_NODE_ENV
- PGXC_OS_THREADS
- PGXC_PREPARED_XACTS
- PGXC_RUNNING_XACTS
- PGXC_STAT_ACTIVITY
- PGXC_STAT_BAD_BLOCK
- PGXC_SQL_COUNT
- PGXC_THREAD_WAIT_STATUS
- PGXC_TOTAL_MEMORY_DETAIL
- PGXC_VARIABLE_INFO
- PGXC_WLM_EC_OPERATOR_HISTORY
- PGXC_WLM_EC_OPERATOR_INFO
- PGXC_WLM_EC_OPERATOR_STATISTICS
- PGXC_WLM_OPERATOR_HISTORY
- PGXC_WLM_OPERATOR_INFO
- PGXC_WLM_OPERATOR_STATISTICS
- PGXC_WLM_REBUILD_USER_RESPOOL
- PGXC_WLM_SESSION_HISTORY
- PGXC_WLM_SESSION_INFO
- PGXC_WLM_SESSION_STATISTICS
- PGXC_WLM_WORKLOAD_RECORDS
- PLAN_TABLE
- PV_FILE_STAT
- PV_INSTANCE_TIME
- PV_OS_RUN_INFO
- PV_REDO_STAT
- PV_SESSION_MEMORY
- PV_SESSION_MEMORY_CONTEXT
- PV_SESSION_MEMORY_DETAIL
- PV_SESSION_STAT
- PV_SESSION_TIME
- PV_THREAD_MEMORY_CONTEXT
- PV_TOTAL_MEMORY_DETAIL
- SYS_DUMMY
-
Schemas
- Information Schema
-
DBE_PERF Schema
- OS
- Instance
- Memory
- File
-
Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- STAT_BAD_BLOCK
- SUMMARY_STAT_BAD_BLOCK
- GLOBAL_STAT_BAD_BLOCK
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_FUNCTIONS
- GLOBAL_STAT_USER_FUNCTIONS
- Workload
-
Session and Thread
- SESSION_STAT
- GLOBAL_SESSION_STAT
- SESSION_TIME
- GLOBAL_SESSION_TIME
- SESSION_MEMORY
- GLOBAL_SESSION_MEMORY
- SESSION_MEMORY_DETAIL
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT_ACTIVITY
- THREAD_WAIT_STATUS
- GLOBAL_THREAD_WAIT_STATUS
- LOCAL_THREADPOOL_STATUS
- GLOBAL_THREADPOOL_STATUS
- SESSION_CPU_RUNTIME
- SESSION_MEMORY_RUNTIME
- STATEMENT_IOSTAT_COMPLEX_RUNTIME
- LOCAL_ACTIVE_SESSION
- GLOBAL_ACTIVE_SESSION
- Transaction
-
Query
- STATEMENT
- SUMMARY_STATEMENT
- STATEMENT_COUNT
- GLOBAL_STATEMENT_COUNT
- SUMMARY_STATEMENT_COUNT
- GLOBAL_STATEMENT_COMPLEX_HISTORY
- GLOBAL_STATEMENT_COMPLEX_HISTORY_TABLE
- GLOBAL_STATEMENT_COMPLEX_RUNTIME
- STATEMENT_RESPONSETIME_PERCENTILE
- STATEMENT_COMPLEX_RUNTIME
- STATEMENT_COMPLEX_HISTORY_TABLE
- STATEMENT_COMPLEX_HISTORY
- STATEMENT_WLMSTAT_COMPLEX_RUNTIME
- GS_SLOW_QUERY_INFO (Discarded)
- GS_SLOW_QUERY_HISTORY (Discarded)
- GLOBAL_SLOW_QUERY_HISTORY (Discarded)
- GLOBAL_SLOW_QUERY_INFO (Discarded)
- STATEMENT_HISTORY
-
Cache and I/O
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_SYS_TABLES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_SEQUENCES
- STATIO_ALL_TABLES
- SUMMARY_STATIO_ALL_TABLES
- GLOBAL_STATIO_ALL_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_ALL_SEQUENCES
- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
- GLOBAL_STAT_DB_CU
- GLOBAL_STAT_SESSION_CU
- Communication Library
-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- POOLER_STATUS
- GLOBAL_COMM_CHECK_CONNECTION_STATUS
- GLOBAL_CKPT_STATUS
- GLOBAL_DOUBLE_WRITE_STATUS
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_POOLER_STATUS
- GLOBAL_RECORD_RESET_TIME
- GLOBAL_REDO_STATUS
- GLOBAL_RECOVERY_STATUS
- CLASS_VITAL_INFO
- USER_LOGIN
- SUMMARY_USER_LOGIN
- GLOBAL_GET_BGWRITER_STATUS
- GLOBAL_SINGLE_FLUSH_DW_STATUS
- GLOBAL_CANDIDATE_STATUS
- Lock
- Wait Event
- Configuration
- Operator
- Workload Manager
- Global Plan Cache
- RTO & RPO
- WDR Snapshot Schema
- GTM Mode
- Materialized View
-
GUC Parameters
- GUC Parameter Usage
- File Location
- Connection and Authentication
- Resource Consumption
- Parallel Data Import
- Write Ahead Log
- HA Replication
- Query Planning
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Workload Management
- Automatic Vacuuming
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Fault Tolerance
- Connection Pool Parameters
- Cluster Transaction Parameters
- Dual-Cluster Replication Parameters
- Developer Options
- Auditing
- Transaction Monitoring
- CM Parameters
- GTM Parameters
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Event
- Query
- System Performance Snapshot
- Security Configuration
- HyperLogLog
- User-defined Functions
- Collaborative Analysis
- Acceleration Cluster
- Scheduled Task
- Thread Pool
- Full Text Search
- Backup and Restoration
- AI Features
- Global SysCache Parameters
- Reserved Parameters
- Error Log Reference
-
API Reference
-
JDBC Interface Reference
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- PGReplicationConnection
- PGReplicationStream
- ChainedStreamBuilder
- ChainedCommonStreamBuilder
- ODBC Interface Reference
- libpq Interface Reference
- Psycopg API Reference
-
JDBC Interface Reference
-
Developer Guide(Centralized_2.x)
- Overview
- Working with Databases
- Development and Design Proposal
- Best Practices
-
Application Development Guide
- Development Specifications
- Obtaining the Driver Package
-
Development Based on JDBC
- JDBC Package, Driver Class, and Environment Class
- Development Process
- Loading the Driver
- Connecting to a Database
- Connecting to the Database (Using SSL)
- Connecting to a Database (Using UDS)
- Running SQL Statements
- Processing Data in a Result Set
- Closing a Connection
- Log Management
- Examples: Common Operations
- Example: Retrying SQL Queries for Applications
- Example: Importing and Exporting Data Through Local Files
- Example: Migrating Data from MY
- Example: Logic Replication Code
- Example: Parameters for Connecting to the Database in Different Scenarios
- JDBC API Reference
- Development Based on ODBC
- Development Based on libpq
- Psycopg-based Development
- Development Based on the Go Driver
- Database Security Management
-
API Reference
-
JDBC
- java.sql.Connection
- java.sql.CallableStatement
- java.sql.DatabaseMetaData
- java.sql.Driver
- java.sql.PreparedStatement
- java.sql.ResultSet
- java.sql.ResultSetMetaData
- java.sql.Statement
- javax.sql.ConnectionPoolDataSource
- javax.sql.DataSource
- javax.sql.PooledConnection
- javax.naming.Context
- javax.naming.spi.InitialContextFactory
- CopyManager
- PGReplicationConnection
- PGReplicationStream
- ChainedStreamBuilder
- ChainedCommonStreamBuilder
-
ODBC
- SQLAllocEnv
- SQLAllocConnect
- SQLAllocHandle
- SQLAllocStmt
- SQLBindCol
- SQLBindParameter
- SQLColAttribute
- SQLConnect
- SQLDisconnect
- SQLExecDirect
- SQLExecute
- SQLFetch
- SQLFreeStmt
- SQLFreeConnect
- SQLFreeHandle
- SQLFreeEnv
- SQLPrepare
- SQLGetData
- SQLGetDiagRec
- SQLSetConnectAttr
- SQLSetEnvAttr
- SQLSetStmtAttr
- Examples
- libpq
- Psycopg
- Go
-
JDBC
- Importing Data
-
Performance Tuning
- Performance Tuning Process
- Determining the Scope of Performance Tuning
-
SQL Optimization
- Query Execution Process
- Introduction to the SQL Execution Plan
- Tuning Process
- Updating Statistics
- Reviewing and Modifying a Table Definition
- Typical SQL Optimization Methods
- Experience in Rewriting SQL Statements
- Resetting Key Parameters During SQL Tuning
-
Hint-based Tuning
- Plan Hint Optimization
- Join Order Hints
- Join Operation Hints
- Rows Hints
- Scan Operation Hints
- Sublink Name Hints
- Hint Errors, Conflicts, and Other Warnings
- Optimizer GUC Parameter Hints
- Hint for Selecting the Custom Plan or Generic Plan
- Hint Specifying Not to Expand Subqueries
- Hint Specifying Not to Use Global Plan Cache
- Hint of Parameterized Paths at the Same Level
- Hint for Materializing a Sub-plan Result
- Using the Vectorized Executor for Tuning
-
Optimization Cases
- Case: Modifying the GUC Parameter rewrite_rule
- Case: Adjusting I/O Parameters to Reduce the Log Bloat Rate
- Case: Creating an Appropriate Index
- Case: Adding NOT NULL for JOIN Columns
- Case: Modifying a Partitioned Table
- Case: Rewriting SQL and Deleting Subqueries (1)
- Case: Rewriting SQL and Deleting Subqueries (2)
- Case: Rewriting SQL Statements and Deleting in-clause
- Configuring Running Parameters
-
SQL Reference
- SQL
- Keywords
- Data Types
- Constant and Macro
-
Functions and Operators
- Logical Operators
- Comparison Operators
- Character Processing Functions and Operators
- Binary String Functions and Operators
- Bit String Functions and Operators
- Mode Matching Operators
- Mathematical Functions and Operators
- Date and Time Processing Functions and Operators
- Type Conversion Functions
- Geometric Functions and Operators
- Network Address Functions and Operators
- Text Search Functions and Operators
- JSON/JSONB Functions and Operators
- HLL Functions and Operators
- SEQUENCE Functions
- Array Functions and Operators
- Range Functions and Operators
- Aggregate Functions
- Window Functions
- Security Functions
- Ledger Database Functions
- Encrypted Equality Functions
- Set Returning Functions
- Conditional Expression Functions
- System Information Functions
-
System Administration Functions
- Configuration Settings Functions
- Universal File Access Functions
- Server Signal Functions
- Backup and Restoration Control Functions
- DR Control Functions for Dual Database Instances
- DR Query Functions for Dual-Database Instances
- Snapshot Synchronization Functions
- Database Object Functions
- Advisory Lock Functions
- Logical Replication Functions
- Segment-Page Storage Functions
- Other Functions
- Undo System Functions
- Statistics Information Functions
- Trigger Functions
- Hash Function
- Prompt Message Function
- Global Temporary Table Functions
- Fault Injection System Function
- Dynamic Data Masking Functions
- Hierarchical Recursion Query Functions
- Other System Functions
- Internal Functions
- Global SysCache Feature Functions
- Data Damage Detection and Repair Functions
- Obsolete Functions
- Expressions
- Type Conversion
- Full Text Search
- System Operation
- Controlling Transactions
- DDL Syntax Overview
- DML Syntax Overview
- DCL Syntax Overview
-
SQL Syntax
- ABORT
- ALTER AGGREGATE
- ALTER AUDIT POLICY
- ALTER DATABASE
- ALTER DATA SOURCE
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- ALTER EXTENSION
- ALTER FOREIGN TABLE
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER LARGE OBJECT
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER OPERATOR
- ALTER PUBLICATION
- ALTER PACKAGE
- ALTER PROCEDURE
- ALTER RESOURCE LABEL
- ALTER ROLE
- ALTER ROW LEVEL SECURITY POLICY
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER SESSION
- ALTER SUBSCRIPTION
- ALTER SYNONYM
- ALTER SYSTEM KILL SESSION
- ALTER TABLE
- ALTER TABLE PARTITION
- ALTER TABLE SUBPARTITION
- ALTER TABLESPACE
- ALTER TEXT SEARCH CONFIGURATION
- ALTER TEXT SEARCH DICTIONARY
- ALTER TRIGGER
- ALTER TYPE
- ALTER USER
- ALTER USER MAPPING
- ALTER VIEW
- ANALYZE | ANALYSE
- BEGIN
- CALL
- CHECKPOINT
- CLEAN CONNECTION
- CLOSE
- CLUSTER
- COMMENT
- COMMIT | END
- COMMIT PREPARED
- COPY
- CREATE AGGREGATE
- CREATE AUDIT POLICY
- CREATE CAST
- CREATE CLIENT MASTER KEY
- CREATE COLUMN ENCRYPTION KEY
- CREATE CONVERSION
- CREATE DATABASE
- CREATE DATA SOURCE
- CREATE DIRECTORY
- CREATE EXTENSION
- CREATE FOREIGN TABLE
- CREATE FUNCTION
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE MODEL
- CREATE OPERATOR
- CREATE PACKAGE
- CREATE PROCEDURE
- CREATE PUBLICATION
- CREATE RESOURCE LABEL
- CREATE ROLE
- CREATE ROW LEVEL SECURITY POLICY
- CREATE RULE
- CREATE SCHEMA
- CREATE SEQUENCE
- CREATE SERVER
- CREATE SUBSCRIPTION
- CREATE SYNONYM
- CREATE TABLE
- CREATE TABLE AS
- CREATE TABLE PARTITION
- CREATE TABLESPACE
- CREATE TABLE SUBPARTITION
- CREATE TEXT SEARCH CONFIGURATION
- CREATE TEXT SEARCH DICTIONARY
- CREATE TRIGGER
- CREATE TYPE
- CREATE USER
- CREATE USER MAPPING
- CREATE VIEW
- CREATE WEAK PASSWORD DICTIONARY
- CURSOR
- DEALLOCATE
- DECLARE
- DELETE
- DO
- DROP AGGREGATE
- DROP AUDIT POLICY
- DROP CAST
- DROP CLIENT MASTER KEY
- DROP COLUMN ENCRYPTION KEY
- DROP DATABASE
- DROP DATA SOURCE
- DROP DIRECTORY
- DROP EXTENSION
- DROP FOREIGN TABLE
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP MODEL
- DROP OPERATOR
- DROP OWNED
- DROP PACKAGE
- DROP PROCEDURE
- DROP RESOURCE LABEL
- DROP ROLE
- DROP ROW LEVEL SECURITY POLICY
- DROP RULE
- DROP PUBLICATION
- DROP SCHEMA
- DROP SEQUENCE
- DROP SERVER
- DROP SUBSCRIPTION
- DROP SYNONYM
- DROP TABLE
- DROP TABLESPACE
- DROP TEXT SEARCH CONFIGURATION
- DROP TEXT SEARCH DICTIONARY
- DROP TRIGGER
- DROP TYPE
- DROP USER
- DROP USER MAPPING
- DROP VIEW
- DROP WEAK PASSWORD DICTIONARY
- EXECUTE
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- INSERT
- LOCK
- MERGE INTO
- MOVE
- PREDICT BY
- PREPARE
- PREPARE TRANSACTION
- PURGE
- REASSIGN OWNED
- REFRESH INCREMENTAL MATERIALIZED VIEW
- REFRESH MATERIALIZED VIEW
- REINDEX
- RELEASE SAVEPOINT
- RESET
- REVOKE
- ROLLBACK
- ROLLBACK PREPARED
- ROLLBACK TO SAVEPOINT
- SAVEPOINT
- SELECT
- SELECT INTO
- SET
- SET CONSTRAINTS
- SET ROLE
- SET SESSION AUTHORIZATION
- SET TRANSACTION
- SHOW
- SHUTDOWN
- SNAPSHOT
- START TRANSACTION
- TIMECAPSULE TABLE
- TRUNCATE
- UPDATE
- VACUUM
- VALUES
- Appendix
- Stored Procedure
-
System Catalogs and System Views
- Overview of System Catalogs and System Views
-
System Catalogs
- GS_ASP
- GS_AUDITING_POLICY
- GS_AUDITING_POLICY_ACCESS
- GS_AUDITING_POLICY_FILTERS
- GS_AUDITING_POLICY_PRIVILEGES
- GS_CLIENT_GLOBAL_KEYS
- GS_CLIENT_GLOBAL_KEYS_ARGS
- GS_COLUMN_KEYS
- GS_COLUMN_KEYS_ARGS
- GS_DB_PRIVILEGE
- GS_ENCRYPTED_COLUMNS
- GS_ENCRYPTED_PROC
- GS_GLOBAL_CHAIN
- GS_GLOBAL_CONFIG
- GS_JOB_ARGUMENT
- GS_JOB_ATTRIBUTE
- GS_MASKING_POLICY
- GS_MASKING_POLICY_ACTIONS
- GS_MASKING_POLICY_FILTERS
- GS_MATVIEW
- GS_MATVIEW_DEPENDENCY
- GS_MODEL_WAREHOUSE
- GS_OPT_MODEL
- GS_PACKAGE
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SQL_PATCH
- GS_TXN_SNAPSHOT
- GS_UID
- GS_WLM_EC_OPERATOR_INFO
- GS_WLM_INSTANCE_HISTORY
- GS_WLM_OPERATOR_INFO
- GS_WLM_PLAN_ENCODING_TABLE
- GS_WLM_PLAN_OPERATOR_INFO
- GS_WLM_SESSION_QUERY_INFO_ALL
- GS_WLM_USER_RESOURCE_HISTORY
- PG_AGGREGATE
- PG_AM
- PG_AMOP
- PG_AMPROC
- PG_APP_WORKLOADGROUP_MAPPING
- PG_ATTRDEF
- PG_ATTRIBUTE
- PG_AUTHID
- PG_AUTH_HISTORY
- PG_AUTH_MEMBERS
- PG_CAST
- PG_CLASS
- PG_COLLATION
- PG_CONSTRAINT
- PG_CONVERSION
- PG_DATABASE
- PG_DB_ROLE_SETTING
- PG_DEFAULT_ACL
- PG_DEPEND
- PG_DESCRIPTION
- PG_DIRECTORY
- PG_ENUM
- PG_EXTENSION
- PG_EXTENSION_DATA_SOURCE
- PG_FOREIGN_DATA_WRAPPER
- PG_FOREIGN_SERVER
- PG_FOREIGN_TABLE
- PG_HASHBUCKET
- PG_INDEX
- PG_INHERITS
- PG_JOB
- PG_JOB_PROC
- PG_LANGUAGE
- PG_LARGEOBJECT
- PG_LARGEOBJECT_METADATA
- PG_NAMESPACE
- PG_OBJECT
- PG_OBSSCANINFO
- PG_OPCLASS
- PG_OPERATOR
- PG_OPFAMILY
- PG_PARTITION
- PG_PLTEMPLATE
- PG_PROC
- PG_PUBLICATION
- PG_PUBLICATION_REL
- PG_RANGE
- PG_REPLICATION_ORIGIN
- PG_RESOURCE_POOL
- PG_REWRITE
- PG_RLSPOLICY
- PG_SECLABEL
- PG_SHDEPEND
- PG_SHDESCRIPTION
- PG_SHSECLABEL
- PG_STATISTIC
- PG_STATISTIC_EXT
- PG_SUBSCRIPTION
- PG_SYNONYM
- PG_TABLESPACE
- PG_TRIGGER
- PG_TS_CONFIG
- PG_TS_CONFIG_MAP
- PG_TS_DICT
- PG_TS_PARSER
- PG_TS_TEMPLATE
- PG_TYPE
- PG_USER_MAPPING
- PG_USER_STATUS
- PG_WORKLOAD_GROUP
- PGXC_CLASS
- PGXC_GROUP
- PGXC_NODE
- PGXC_SLICE
- PLAN_TABLE_DATA
- STATEMENT_HISTORY
- STREAMING_STREAM
- STREAMING_CONT_QUERY
- STREAMING_REAPER_STATUS
-
System Views
- ADM_COL_COMMENTS
- ADM_CONSTRAINTS
- ADM_CONS_COLUMNS
- ADM_DATA_FILES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_INDEXES
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_IND_PARTITIONS
- ADM_IND_SUBPARTITIONS
- ADM_PART_INDEXES
- ADM_OBJECTS
- ADM_PART_TABLES
- ADM_PROCEDURES
- ADM_SCHEDULER_JOBS
- ADM_SEQUENCES
- ADM_SOURCE
- ADM_SYNONYMS
- ADM_TAB_SUBPARTITIONS
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_PARTITIONS
- ADM_TRIGGERS
- ADM_TYPE_ATTRS
- ADM_USERS
- ADM_VIEWS
- DB_ALL_TABLES
- DB_COL_COMMENTS
- DB_CONSTRAINTS
- DB_CONS_COLUMNS
- DB_DEPENDENCIES
- DB_IND_COLUMNS
- DB_IND_EXPRESSIONS
- DB_IND_PARTITIONS
- DB_IND_SUBPARTITIONS
- DB_INDEXES
- DB_OBJECTS
- DB_PROCEDURES
- DB_PART_INDEXES
- DB_PART_TABLES
- DB_SEQUENCES
- DB_SOURCE
- DB_SYNONYMS
- DB_TAB_PARTITIONS
- DB_TAB_SUBPARTITIONS
- DB_TAB_COLUMNS
- DB_TAB_COMMENTS
- DB_TABLES
- DB_TRIGGERS
- DB_USERS
- DB_VIEWS
- DV_SESSIONS
- DV_SESSION_LONGOPS
- GET_GLOBAL_PREPARED_XACTS (Discarded)
- GS_ALL_CONTROL_GROUP_INFO
- GS_AUDITING
- GS_AUDITING_ACCESS
- GS_AUDITING_PRIVILEGE
- GS_CLUSTER_RESOURCE_INFO
- GS_COMM_PROXY_THREAD_STATUS
- GS_DB_PRIVILEGES
- GS_FILE_STAT
- GS_GET_CONTROL_GROUP_INFO
- GS_GSC_MEMORY_DETAIL
- GS_INSTANCE_TIME
- GS_LABELS
- GS_LSC_MEMORY_DETAIL
- GS_MASKING
- GS_MATVIEWS
- GS_OS_RUN_INFO
- GS_REDO_STAT
- GS_SESSION_CPU_STATISTICS
- GS_SESSION_MEMORY
- GS_SESSION_MEMORY_CONTEXT
- GS_SESSION_MEMORY_DETAIL
- GS_SESSION_MEMORY_STATISTICS
- GS_SESSION_STAT
- GS_SESSION_TIME
- GS_SQL_COUNT
- GS_STAT_SESSION_CU
- GS_THREAD_MEMORY_CONTEXT
- GS_TOTAL_MEMORY_DETAIL
- GS_TOTAL_NODEGROUP_MEMORY_DETAIL
- GS_WLM_CGROUP_INFO
- GS_WLM_EC_OPERATOR_STATISTICS
- GS_WLM_OPERATOR_HISTORY
- GS_WLM_OPERATOR_STATISTICS
- GS_WLM_PLAN_OPERATOR_HISTORY
- GS_WLM_REBUILD_USER_RESOURCE_POOL
- GS_WLM_RESOURCE_POOL
- GS_WLM_SESSION_HISTORY
- GS_WLM_SESSION_INFO
- GS_WLM_SESSION_INFO_ALL
- GS_WLM_SESSION_STATISTICS
- GS_WLM_USER_INFO
- GS_WLM_WORKLOAD_RECORDS
- GV_SESSION
- MPP_TABLES
- MY_COL_COMMENTS
- MY_CONSTRAINTS
- MY_CONS_COLUMNS
- MY_INDEXES
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_IND_PARTITIONS
- MY_IND_SUBPARTITIONS
- MY_JOBS
- MY_OBJECTS
- MY_PART_INDEXES
- MY_PART_TABLES
- MY_PROCEDURES
- MY_SEQUENCES
- MY_SOURCE
- MY_SYNONYMS
- MY_TAB_COLUMNS
- MY_TAB_COMMENTS
- MY_TAB_PARTITIONS
- MY_TAB_SUBPARTITIONS
- MY_TABLES
- MY_TRIGGERS
- MY_VIEWS
- PG_AVAILABLE_EXTENSION_VERSIONS
- PG_AVAILABLE_EXTENSIONS
- PG_CURSORS
- PG_COMM_DELAY
- PG_COMM_RECV_STREAM
- PG_COMM_SEND_STREAM
- PG_COMM_STATUS
- PG_CONTROL_GROUP_CONFIG
- PG_EXT_STATS
- PG_GET_INVALID_BACKENDS
- PG_GET_SENDERS_CATCHUP_TIME
- PG_GROUP
- PG_GTT_RELSTATS
- PG_GTT_STATS
- PG_GTT_ATTACHED_PIDS
- PG_INDEXES
- PG_LOCKS
- PG_NODE_ENV
- PG_OS_THREADS
- PG_PREPARED_STATEMENTS
- PG_PREPARED_XACTS
- PG_PUBLICATION_TABLES
- PG_REPLICATION_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- PG_SESSION_IOSTAT
- PG_SESSION_WLMSTAT
- PG_SETTINGS
- PG_SHADOW
- PG_STATS
- PG_STAT_ACTIVITY
- PG_STAT_ACTIVITY_NG
- PG_STAT_ALL_INDEXES
- PG_STAT_ALL_TABLES
- PG_STAT_BAD_BLOCK
- PG_STAT_BGWRITER
- PG_STAT_DATABASE
- PG_STAT_DATABASE_CONFLICTS
- PG_STAT_USER_FUNCTIONS
- PG_STAT_USER_INDEXES
- PG_STAT_USER_TABLES
- PG_STAT_REPLICATION
- PG_STAT_SUBSCRIPTION
- PG_STAT_SYS_INDEXES
- PG_STAT_SYS_TABLES
- PG_STAT_XACT_ALL_TABLES
- PG_STAT_XACT_SYS_TABLES
- PG_STAT_XACT_USER_FUNCTIONS
- PG_STAT_XACT_USER_TABLES
- PG_STATIO_ALL_INDEXES
- PG_STATIO_ALL_SEQUENCES
- PG_STATIO_ALL_TABLES
- PG_STATIO_SYS_INDEXES
- PG_STATIO_SYS_SEQUENCES
- PG_STATIO_SYS_TABLES
- PG_STATIO_USER_INDEXES
- PG_STATIO_USER_SEQUENCES
- PG_STATIO_USER_TABLES
- PG_TABLES
- PG_TDE_INFO
- PG_THREAD_WAIT_STATUS
- PG_TIMEZONE_ABBREVS
- PG_TIMEZONE_NAMES
- PG_TOTAL_MEMORY_DETAIL
- PG_TOTAL_USER_RESOURCE_INFO
- PG_TOTAL_USER_RESOURCE_INFO_OID
- PG_USER
- PG_USER_MAPPINGS
- PG_VIEWS
- PG_VARIABLE_INFO
- PG_WLM_STATISTICS
- PGXC_PREPARED_XACTS
- PGXC_THREAD_WAIT_STATUS
- PLAN_TABLE
- SYS_DUMMY
-
Schemas
-
DBE_PERF Schema
- OS
- Instance
- Memory
- File
-
Object
- STAT_USER_TABLES
- SUMMARY_STAT_USER_TABLES
- GLOBAL_STAT_USER_TABLES
- STAT_USER_INDEXES
- SUMMARY_STAT_USER_INDEXES
- GLOBAL_STAT_USER_INDEXES
- STAT_SYS_TABLES
- SUMMARY_STAT_SYS_TABLES
- GLOBAL_STAT_SYS_TABLES
- STAT_SYS_INDEXES
- SUMMARY_STAT_SYS_INDEXES
- GLOBAL_STAT_SYS_INDEXES
- STAT_ALL_TABLES
- SUMMARY_STAT_ALL_TABLES
- GLOBAL_STAT_ALL_TABLES
- STAT_ALL_INDEXES
- SUMMARY_STAT_ALL_INDEXES
- GLOBAL_STAT_ALL_INDEXES
- STAT_DATABASE
- SUMMARY_STAT_DATABASE
- GLOBAL_STAT_DATABASE
- STAT_DATABASE_CONFLICTS
- SUMMARY_STAT_DATABASE_CONFLICTS
- GLOBAL_STAT_DATABASE_CONFLICTS
- STAT_XACT_ALL_TABLES
- SUMMARY_STAT_XACT_ALL_TABLES
- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
- GLOBAL_STAT_XACT_SYS_TABLES
- STAT_XACT_USER_TABLES
- SUMMARY_STAT_XACT_USER_TABLES
- GLOBAL_STAT_XACT_USER_TABLES
- STAT_XACT_USER_FUNCTIONS
- SUMMARY_STAT_XACT_USER_FUNCTIONS
- GLOBAL_STAT_XACT_USER_FUNCTIONS
- STAT_BAD_BLOCK
- SUMMARY_STAT_BAD_BLOCK
- GLOBAL_STAT_BAD_BLOCK
- STAT_USER_FUNCTIONS
- SUMMARY_STAT_USER_FUNCTIONS
- GLOBAL_STAT_USER_FUNCTIONS
- Workload
-
Session/Thread
- SESSION_STAT
- GLOBAL_SESSION_STAT
- SESSION_TIME
- GLOBAL_SESSION_TIME
- SESSION_MEMORY
- GLOBAL_SESSION_MEMORY
- SESSION_MEMORY_DETAIL
- GLOBAL_SESSION_MEMORY_DETAIL
- SESSION_STAT_ACTIVITY
- GLOBAL_SESSION_STAT_ACTIVITY
- THREAD_WAIT_STATUS
- GLOBAL_THREAD_WAIT_STATUS
- LOCAL_THREADPOOL_STATUS
- GLOBAL_THREADPOOL_STATUS
- SESSION_CPU_RUNTIME
- SESSION_MEMORY_RUNTIME
- STATEMENT_IOSTAT_COMPLEX_RUNTIME
- LOCAL_ACTIVE_SESSION
- Transaction
-
Query
- STATEMENT
- SUMMARY_STATEMENT
- STATEMENT_COUNT
- GLOBAL_STATEMENT_COUNT
- SUMMARY_STATEMENT_COUNT
- GLOBAL_STATEMENT_COMPLEX_HISTORY
- GLOBAL_STATEMENT_COMPLEX_HISTORY_TABLE
- GLOBAL_STATEMENT_COMPLEX_RUNTIME
- STATEMENT_RESPONSETIME_PERCENTILE
- STATEMENT_COMPLEX_RUNTIME
- STATEMENT_COMPLEX_HISTORY_TABLE
- STATEMENT_COMPLEX_HISTORY
- STATEMENT_WLMSTAT_COMPLEX_RUNTIME
- STATEMENT_HISTORY
- GS_SLOW_QUERY_INFO (Discarded)
- GS_SLOW_QUERY_HISTORY (Discarded)
- GLOBAL_SLOW_QUERY_HISTORY (Discarded)
- GLOBAL_SLOW_QUERY_INFO (Discarded)
-
Cache/IO
- STATIO_USER_TABLES
- SUMMARY_STATIO_USER_TABLES
- GLOBAL_STATIO_USER_TABLES
- STATIO_USER_INDEXES
- SUMMARY_STATIO_USER_INDEXES
- GLOBAL_STATIO_USER_INDEXES
- STATIO_USER_SEQUENCES
- SUMMARY_STATIO_USER_SEQUENCES
- GLOBAL_STATIO_USER_SEQUENCES
- STATIO_SYS_TABLES
- SUMMARY_STATIO_SYS_TABLES
- GLOBAL_STATIO_SYS_TABLES
- STATIO_SYS_INDEXES
- SUMMARY_STATIO_SYS_INDEXES
- GLOBAL_STATIO_SYS_INDEXES
- STATIO_SYS_SEQUENCES
- SUMMARY_STATIO_SYS_SEQUENCES
- GLOBAL_STATIO_SYS_SEQUENCES
- STATIO_ALL_TABLES
- SUMMARY_STATIO_ALL_TABLES
- GLOBAL_STATIO_ALL_TABLES
- STATIO_ALL_INDEXES
- SUMMARY_STATIO_ALL_INDEXES
- GLOBAL_STATIO_ALL_INDEXES
- STATIO_ALL_SEQUENCES
- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
- GLOBAL_STAT_DB_CU
- GLOBAL_STAT_SESSION_CU
-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- BGWRITER_STAT
- GLOBAL_BGWRITER_STAT
- GLOBAL_CKPT_STATUS
- GLOBAL_DOUBLE_WRITE_STATUS
- GLOBAL_PAGEWRITER_STATUS
- GLOBAL_RECORD_RESET_TIME
- GLOBAL_REDO_STATUS
- GLOBAL_RECOVERY_STATUS
- CLASS_VITAL_INFO
- USER_LOGIN
- SUMMARY_USER_LOGIN
- GLOBAL_SINGLE_FLUSH_DW_STATUS
- GLOBAL_CANDIDATE_STATUS
- Lock
- Wait Events
- Configuration
- Operator
- Workload Manager
- Global Plancache
- RTO & RPO
- WDR Snapshot Schema
-
DBE_PLDEBUGGER Schema
- DBE_PLDEBUGGER.turn_on
- DBE_PLDEBUGGER.turn_off
- DBE_PLDEBUGGER.local_debug_server_info
- DBE_PLDEBUGGER.attach
- DBE_PLDEBUGGER.info_locals
- DBE_PLDEBUGGER.next
- DBE_PLDEBUGGER.continue
- DBE_PLDEBUGGER.abort
- DBE_PLDEBUGGER.print_var
- DBE_PLDEBUGGER.info_code
- DBE_PLDEBUGGER.step
- DBE_PLDEBUGGER.add_breakpoint
- DBE_PLDEBUGGER.delete_breakpoint
- DBE_PLDEBUGGER.info_breakpoints
- DBE_PLDEBUGGER.backtrace
- DBE_PLDEBUGGER.enable_breakpoint
- DBE_PLDEBUGGER.disable_breakpoint
- DBE_PLDEBUGGER.finish
- DBE_PLDEBUGGER.set_var
- DBE_SQL_UTIL Schema
-
DBE_PERF Schema
- Logical Replication
- Materialized View
-
GUC Parameters
- GUC Parameter Usage
- File Location
- Connection and Authentication
- Resource Consumption
- Write Ahead Log
- HA Replication
- Query Planning
- Error Reporting and Logging
- Alarm Detection
- Statistics During the Database Running
- Workload Management
- Automatic Vacuuming
- Default Settings of Client Connection
- Lock Management
- Version and Platform Compatibility
- Fault Tolerance
- Connection Pool Parameters
- Transaction
- Replication Parameters of Two Database Instances
- Developer Options
- Auditing
- CM Parameters
- Upgrade Parameters
- Miscellaneous Parameters
- Wait Events
- Query
- System Performance Snapshot
- Security Configuration
- Global Temporary Table
- HyperLogLog
- User-defined Functions
- Scheduled Task
- Thread Pool
- Backup and Restoration
- Undo
- DCF Parameters Settings
- Flashback
- Rollback Parameters
- Reserved Parameters
- Global SysCache Parameters
- Error Log Reference
-
Developer Guide(Distributed_8.x)
- Tool Guide
-
Feature Guide
-
Feature Guide(Distributed_8.x)
- Materialized View
- Setting Encrypted Equality Queries
-
Partitioned Table
- Large-Capacity Database
- Introduction to Partitioned Tables
- Partitioned Table Query Optimization
- Partitioned Table O&M Management
- System Views & DFX Related to Partitioned Tables
- Storage Engine
- FDW
- Logical Replication
-
Feature Guide(Centralized_8.x)
- Materialized View
- Setting Encrypted Equality Query
-
Partitioned Table
- Large-Capacity Database
- Introduction to Partitioned Tables
- Partitioned Table Query Optimization
- Automatic Partitioning
- Partitioned Table O&M Management
- Partition Concurrency Control
- System Views & DFX Related to Partitioned Tables
- Storage Engine
- Foreign Data Wrapper
- Logical Replication
-
Feature Guide(Distributed_3.x)
- Materialized View
- Setting Encrypted Equality Queries
-
Partitioned Table
- Large-Capacity Database
- Introduction to Partitioned Tables
- Partitioned Table Query Optimization
- Partitioned Table O&M Management
- System Views & DFX Related to Partitioned Tables
- Storage Engine
- FDW
- Logical Replication
-
Feature Guide(Centralized_3.x)
- Materialized View
- Setting Encrypted Equality Query
-
Partitioned Table
- Large-Capacity Database
- Introduction to Partitioned Tables
- Partitioned Table Query Optimization
- Partitioned Table O&M Management
- Partition Concurrency Control
- System Views & DFX Related to Partitioned Tables
- Storage Engine
- Foreign Data Wrapper
- Logical Replication
-
Feature Guide(Distributed_8.x)
- Best Practices
- Performance White Paper
-
API Reference
- Before You Start
- API Overview
- Calling APIs
-
APIs (Recommended)
- DB Engine Versions and Specifications
- Storage Management
-
Instance Management
- Creating a DB Instance (v3.2)
- Creating a DB Instance (v5)
- Adding CNs and DN Shards and Scaling Up Storage
- Deleting a DB Instance
- Querying DB Instances
- Resetting a Database Password
- Changing a DB Instance Name
- Rebooting a DB Instance
- Switching Roles of the Primary and Standby DNs in Shards
- Querying the Components of a DB Instance
- Changing the vCPUs and Memory of a DB Instance
- Checking Whether Host Load Is Unbalanced Due to a Primary/Standby Switchover
- Querying Solution Template Settings
- Querying EIPs Bound to a DB Instance
- Validating Password Strength
- Binding or Unbinding an EIP
- Querying the SSL Certificate Download Address of a DB Instance
- Querying the Instance Quotas of a Tenant
- Starting a DB Instance or Node
- Stopping a DB Instance or Node
- Enabling M Compatibility Port
- Changing or Disabling M Compatibility Port
- Querying the Top I/O Threads
- Querying CNs
- Querying Storage Autoscaling Policies of a DB Instance
- Querying Advanced Features
- Enabling or Disabling Advanced Features
-
Parameter Configuration
- Obtaining Parameter Templates
- Obtaining the Parameters of a Specified DB Instance
- Modifying Parameters of a Specified DB Instance
- Creating a Parameter Template
- Deleting a Parameter Template
- Querying Details About a Parameter Template
- Replicating a Parameter Template
- Resetting a Parameter Template
- Obtaining the Differences of Two Parameter Templates
- Querying Instances That a Parameter Template Can Be Applied To
- Checking Whether the Parameter Template Name Exists
- Applying a Parameter Template
- Querying Application Records of a Parameter Template
- Querying Change History of a Parameter Template
- Version Upgrade
-
Backup and Restoration
- Configuring an Automated Backup Policy
- Querying an Automated Backup Policy
- Querying Backups
- Creating a Manual Backup
- Stopping a Backup
- Deleting a Manual Backup
- Querying the Restoration Time Range
- Restoring Data to a New instance
- Querying Instances That Can Be Used for Backups and Restorations
- Querying Information About the Original Instance Based on a Specific Point of Time or a Backup File
- Restoring Data to the Original or Existing Instance
- Confirming Data Integrity After a Backup Is Restored
- Log Management
- SQL Throttling
-
Database and Account Management
- Creating a Database
- Creating a Database Account
- Creating a Database Schema
- Configuring Permissions of Database Accounts
- Resetting a Password for a Database Account
- Querying Databases
- Querying Database Users
- Querying Database Schemas
- Deleting a Database
- Deleting a Schema
- Creating a Database Role
- Querying Database Roles
- Configuring Permissions of a Database Role
- Tag Management
- Quota Management
- Task Management
- Recycle Bin
- Plug-in Management
- Historical APIs
- Permissions Policies and Supported Actions
- Appendix
- SDK Reference
-
FAQs
-
About GaussDB
- What Should I Pay Attention to When Using GaussDB?
- What Is the Availability of GaussDB Instances?
- Will My GaussDB Instances Be Affected by Other Users' Instances?
- What Can I Do About Slow Responses of Websites When They Use GaussDB?
- Can Multiple ECSs Connect to the Same GaussDB Instance?
- Can I Encrypt the Disk After Purchasing a GaussDB Instance?
- Will Backups Be Encrypted After Disk Encryption Is Enabled for My GaussDB Instance?
- Will Different GaussDB Instances Share CPU and Memory Resources?
- How Many Databases Can Run on a GaussDB Instance?
- What Is the Relationship Between GaussDB and PostgreSQL?
- Can Multiple Users Log In to a GaussDB Instance Through DAS at the Same Time? Will the Accounts Be Locked If I Enter Wrong Passwords Several Times in a Row?
- What Are the Differences Between the Independent Deployment Model and Combined Deployment Model of GaussDB Distributed Instances?
- What Are the Differences Between the General-Purpose, Dedicated, and Kunpeng Dedicated Specification Types Provided GaussDB?
- Can I Switch Between the GaussDB Enterprise Edition and Basic Edition?
- GaussDB Resource Freezing, Unfreezing, Release, Deletion, and Unsubscription
- Resource and Disk Management
-
Database Connections
- What Should I Do If I Can't Connect to My GaussDB Instance?
- Can an External Server Access GaussDB Instances?
- Do Applications Need to Support Automatic Reconnections to GaussDB Databases?
- Why Can't I Ping My EIP After It Is Bound to a GaussDB Instance?
- Can I Access a GaussDB Instance Over an Intranet Connection Across Regions?
- Database Storage
-
Database Usage
- How Do I Use DAS to Query SQL Statements Executed in GaussDB?
- What Should I Do If Garbled Characters Are Displayed After SQL Query Results Are Exported to an Excel File for My GaussDB Instance?
- What Do I Do If the root Account of My GaussDB Instance Is Locked?
- Why Did the New Password Not Take Effect After I Reset the Administrator Password of a GaussDB Instance?
- What Do I Do If Replay Speed of Standby DNs Cannot Catch Up with Write Speed of Primary DN?
- Can I Change the VPC to Which My GaussDB Instance Belongs?
-
Backup and Restoration
- How Long Does GaussDB Store Backup Data?
- How Do I Clear GaussDB Backup Space?
- Can My GaussDB Instance Still Be Used in the Backup Window?
- How Is GaussDB Backup Data Billed?
- How Can I Back Up a GaussDB Database to an ECS?
- Will Backups Be Retained After My GaussDB Instance Is Deleted?
- Why Does Automated Backup for a GaussDB Instance Fail?
- Why Is Data Table Lost or Data Deleted from My GaussDB Instance?
- Does GaussDB Support Restoring Data for Individual Tables?
- How Can I Delete the GaussDB Backup Policy?
- Database Monitoring
- Scaling and Specification Change
-
Database Parameter Modification
- How Can I Change the Time Zone of a GaussDB Instance?
- How Can I Configure a Password Expiration Policy?
- Can I Use SQL Commands in GaussDB to Modify Global Parameters?
- Can I Enable SELECT Operation Auditing in GaussDB?
- How Do I Set the Disk Usage Threshold for Putting a Database Node into Read-Only Mode in GaussDB?
- How Do I Set the Date and Time Display Format in GaussDB?
- How Do I Set the Time Zone Used for Displaying and Interpreting Timestamps in GaussDB?
- How Do I Change the Maximum Number of DN Connections Allowed in GaussDB?
- How Do I Enable the Audit of INSERT, UPDATE, and DELETE Operations in GaussDB?
- How Do I Set the Maximum Number of WAL Sender Threads That Can Be Created in GaussDB?
- How Do I Set the Maximum Number of Bytes to Be Logged for Each SQL Statement in GaussDB?
- How Do I Set the Connection Timeout Interval for GaussDB?
- How Do I Set the Automatic Unlocking Time After an Account Is Locked in GaussDB?
- How Do I Set the Maximum Number of Failed Login Attempts for Accounts in GaussDB?
- Log Management
- Network Security
-
About GaussDB
-
Compatibility
- Oracle Compatibility(Distributed)
- Oracle Compatibility(Centralized)
-
MySQL Compatibility(Distributed)
- Overview
- MySQL Compatibility in MySQL-Compatible Mode
- MySQL Compatibility in M-compatible Mode
-
MySQL Compatibility(Centralized)
- Introduction
- MySQL Compatibility in B-Compatible Mode
- MySQL Compatibility in M-Compatible Mode
- Videos
- General Reference
- convert_string_to_digit
- nls_timestamp_format
- nls_timestamp_tz_format
- group_concat_max_len
- max_function_args
- transform_null_equals
- support_extended_features
- enable_extension
- sql_compatibility
- b_format_behavior_compat_options
- behavior_compat_options
- plsql_compile_check_options
- a_format_version
- a_format_dev_version
- plpgsql.variable_conflict
- td_compatible_truncation
- uppercase_attribute_name
- lastval_supported
- a_format_copy_version
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Platform and Client Compatibility
Many platforms use the database system. External compatibility of the database system provides a lot of convenience for platforms.
convert_string_to_digit
Parameter description: Specifies the implicit conversion priority, which determines whether to preferentially convert strings into numbers.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that strings are preferentially converted into numbers.
- off indicates that strings are not preferentially converted into numbers.
Default value: on
Adjusting this parameter will change the internal data type conversion rule and cause unexpected behaviors. Exercise caution when performing this operation.
nls_timestamp_format
Parameter description: Specifies the default timestamp format.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: DD-Mon-YYYY HH:MI:SS.FF AM
nls_timestamp_tz_format
Parameter description: Specifies the default timestamp with time zone format.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string. The supported formats are the same as those of nls_timestamp_format.
Default value: DD-Mon-YYYY HH:MI:SS.FF AM
This parameter is valid only when a_format_version is set to 10c and a_format_dev_version is set to s1.
group_concat_max_len
Parameter description: This parameter is used together with the GROUP_CONCAT function to limit the length of the return value. If the length exceeds the limit, the exceeded part of the return value is truncated.
This is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: 0 to 9223372036854775807
Default value: 1024
Currently, the maximum length that can be returned is 1073741823. If the length exceeds the limit, the out of memory error is reported.
max_function_args
Parameter description: Specifies the maximum number of parameters allowed for a function.
This parameter is a fixed INTERNAL parameter and cannot be modified.
Value range: an integer
Default value: 8192
transform_null_equals
Parameter description: Specifies whether expressions of the form expr = NULL (or NULL = expr) are treated as expr IS NULL. They return true if expr evaluates to the NULL value, and false otherwise.
- The correct SQL-standard-compliant behavior of expr = NULL is to always return NULL (unknown).
- Filtered forms in Microsoft Access generate queries that appear to use expr = NULL to test for null values. If you enable this option, you can use this interface to access the database.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that expressions of the form expr = NULL (or NULL = expr) are treated as expr IS NULL.
- off indicates that expr = NULL always returns NULL (unknown).
Default value: off
New users are always confused about the semantics of expressions involving NULL values. Therefore, off is used as the default value.
support_extended_features
Parameter description: Specifies whether extended database features are supported.
This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that extended database features are supported.
- off indicates that extended database features are not supported.
Default value: off
enable_extension
Parameter description: Specifies whether to support the creation of database extensions.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that the creation of database extensions is supported.
- off indicates that the creation of database extensions is not supported.
Default value: off
The extension function is for internal use only. You are not advised to use it.
sql_compatibility
Parameter description: Specifies the type of mainstream database with which the SQL syntax and statement behavior of the database is compatible. This parameter is an INTERNAL parameter. It can be viewed but cannot be modified.
Value range: enumerated type
- A indicates that the database is compatible with the Oracle database.
- B indicates that the database is compatible with the MySQL database.
- C indicates that the database is compatible with the Teradata database.
- PG indicates that the database is compatible with the PostgreSQL database.
Default value: A
- This parameter can be set only when you run the CREATE DATABASE command to create a database. For details, see "SQL Reference > SQL Syntax > CREATE DATABASE" in the Developer Guide.
- In the database, this parameter must be set to a specific value. It can be set to A or B and cannot be changed. Otherwise, the setting is not consistent with the database behavior.
b_format_behavior_compat_options
Parameter description: Specifies a B-compatible database configuration item. Multiple items are separated by commas (,).
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: ""
- Currently, only B-compatible configuration items listed in Table 1 are supported.
- Multiple items are separated by commas (,), for example, set b_format_behavior_compat_options='enable_set_variables,set_session_transaction';.
Item |
Behavior |
---|---|
enable_set_variables |
Indicates whether to enable the enhancement of the SET syntax.
|
set_session_transaction |
Indicates whether to enable the SET SESSION TRANSACTION syntax.
|
enable_modify_column |
Indicates whether to enable the ALTER TABLE MODIFY syntax.
|
default_collation |
Indicates whether to enable forward compatibility of the default collation.
|
behavior_compat_options
Parameter description: Specifies database compatibility behavior. Multiple items are separated by commas (,).
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: ""
- Currently, only items in Table 2 are supported.
- Multiple items are separated by commas (,), for example, set behavior_compat_options='end_month_calculate,display_leading_zero';.
Configuration Item |
Behavior |
||||
---|---|---|---|---|---|
display_leading_zero |
Specifies how floating-point numbers are displayed. It controls the display of zeros before the decimal point of all character string types (such as char, character, nchar, varchar, character varying, varchar2, nvarchar2, text, and clob) and any precision types (such as float4, float8, and numeric) in the numeric type. In addition, the length of the calculated number is displayed synchronously.
|
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end_month_calculate |
Specifies the calculation logic of the add_months function. Assume that the two parameters of the add_months function are param1 and param2, and that the month of param1 and param2 is result.
|
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compat_analyze_sample |
Specifies the sampling behavior of the ANALYZE operation. If this item is specified, the sample collected by the ANALYZE operation will be limited to around 30,000 records, controlling database node memory consumption and maintaining the stability of ANALYZE. |
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bind_schema_tablespace |
Binds a schema with the tablespace with the same name. If a tablespace name is the same as sche_name, default_tablespace will also be set to sche_name if search_path is set to sche_name. |
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bind_procedure_searchpath |
Specifies the search path of the database object in a stored procedure for which no schema name is specified. If no schema name is specified for a stored procedure, the search is performed in the schema to which the stored procedure belongs. If the stored procedure is not found, the following operations are performed:
|
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correct_to_number |
Specifies the compatibility of the to_number() result. If this item is not set, the result of the to_number() function is the same as that in the A database by default.
If this item is set, the result of the to_number() function is the same as that of pg11.
|
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unbind_divide_bound |
Specifies the range check on the result of integer division. If this item is not set, the range of the division result is verified. For example, an out-of-bounds error is reported because the output result of INT_MIN/(–1) is greater than INT_MAX.
If this item is set, the range of the division result does not need to be verified. For example, the output result of INT_MIN/(–1) is INT_MAX+1.
|
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convert_string_digit_to_numeric |
Determines whether to convert numeric constants of the character string type to those of the numeric type before these two types are compared.
|
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return_null_string |
Specifies how to display the empty result (empty string '') of the lpad() and rpad() functions.
|
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compat_concat_variadic |
Specifies the compatibility of variadic results of the concat() and concat_ws() functions. The B database does not have the variadic type. Therefore, this option has no impact on the B database. If this item is not set and the concat function parameter is of the variadic type, the results of the A and C databases in compatibility mode are the same by default.
If this item is set and the concat function parameter is of the variadic type, different result formats of the A and C databases in compatibility mode are retained.
|
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merge_update_multi |
When MERGE INTO ... WHEN MATCHED THEN UPDATE (see "SQL Reference" > "SQL Syntax" > "MERGE INTO" in Developer Guide) and INSERT ... ON DUPLICATE KEY UPDATE (see "SQL Reference" > "SQL Syntax" > "INSERT" in Developer Guide) are used, it controls the UPDATE behavior if a piece of target data in the target table conflicts with multiple pieces of source data. If this item is specified and the preceding scenario exists, the system performs multiple UPDATE operations on the conflicting row. Otherwise, an error is reported by default, that is, the MERGE or INSERT operation fails. |
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plstmt_implicit_savepoint |
Determines whether the execution of an UPDATE statement in a stored procedure has an independent subtransaction. If this parameter is set, the implicit savepoint is enabled before executing each UPDATE statement in the stored procedure, and the subtransaction is rolled backed to the latest savepoint in the EXCEPTION block by default, ensuring that only the modification of failed statements is rolled back. This option is used to be compatible with the EXCEPTION behavior of the O database. |
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hide_tailing_zero |
Configuration item for numeric display. If this parameter is not set, numeric data is displayed in the specified precision. If this parameter is set, the trailing zeros after the decimal point are hidden in all scenarios where numeric values are output, even if the precision format is specified. gaussdb=# set behavior_compat_options='hide_tailing_zero'; gaussdb=# select cast(123.123 as numeric(15,10)) as a, to_char(cast(123.123 as numeric(15,10)), '999D999999'); a | to_char ---------+---------- 123.123 | 123.123 (1 row) gaussdb=# set behavior_compat_options=''; gaussdb=# select cast(123.123 as numeric(15,10)) as a, to_char(cast(123.123 as numeric(15,10)), '999D999999'); a | to_char ----------------+------------- 123.1230000000 | 123.123000 (1 row) |
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rownum_type_compat |
Specifies the ROWNUM type. The default value is BIGINT. After this parameter is specified, the value is changed to NUMERIC. gaussdb=# set behavior_compat_options=''; gaussdb=# create table tb_test(c1 int,c2 varchar2,c3 varchar2); gaussdb=# insert into tb_test values(1,'a','b'); gaussdb=# create or replace view v_test as select rownum from tb_test; gaussdb=# \d+ v_test View "public.v_test" Column | Type | Modifiers | Storage | Description --------+--------+-----------+---------+------------- rownum | bigint | | plain | View definition: SELECT ROWNUM AS "rownum" FROM tb_test; gaussdb=# set behavior_compat_options = 'rownum_type_compat'; gaussdb=# create or replace view v_test1 as select rownum from tb_test; gaussdb=# \d+ v_test1 View "public.v_test1" Column | Type | Modifiers | Storage | Description --------+---------+-----------+---------+------------- rownum | numeric | | main | View definition: SELECT ROWNUM AS "rownum" FROM tb_test; |
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aformat_null_test |
Specifies the logic for checking whether rowtype is not null. When this parameter is set, if one column in a row is not empty, true is returned for checking whether rowtype is not null. When this parameter is not set, if all columns in a row are not empty, true is returned for checking whether rowtype is not null. This parameter has no influence on checking whether rowtype is not null. gaussdb=# set behavior_compat_options='aformat_null_test'; gaussdb=# select r, r is null as isnull, r is not null as isnotnull from (values (1,row(1,2)), (1,row(null,null)), (1,null), (null,row(1,2)), (null,row(null,null)), (null,null) ) r(a,b); r | isnull | isnotnull -------------+--------+----------- (1,"(1,2)") | f | t (1,"(,)") | f | t (1,) | f | t (,"(1,2)") | f | t (,"(,)") | f | t (,) | t | f (6 rows) gaussdb=# set behavior_compat_options=''; gaussdb=# select r, r is null as isnull, r is not null as isnotnull from (values (1,row(1,2)), (1,row(null,null)), (1,null), (null,row(1,2)), (null,row(null,null)), (null,null) ) r(a,b); r | isnull | isnotnull -------------+--------+----------- (1,"(1,2)") | f | t (1,"(,)") | f | t (1,) | f | f (,"(1,2)") | f | f (,"(,)") | f | f (,) | t | f (6 rows) |
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aformat_regexp_match |
Determines the matching behavior of regular expression functions.
When this parameter is set and sql_compatibility is set to A or B, the options supported by the flags parameter of the regular expression are changed as follows:
Otherwise, the meanings of the options supported by the flags parameter of the regular expression are as follows:
|
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compat_cursor |
Determines the compatibility behavior of implicit cursor states. If this parameter is set and the O compatibility mode is used, the effective scope of implicit cursor states (SQL%FOUND, SQL%NOTFOUND, SQL%ISOPNE, and SQL%ROWCOUNT) is extended from only the currently executed function to all subfunctions invoked by this function. |
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proc_outparam_override |
Determines the overloading of output parameters of a stored procedure. After this parameter is enabled, the stored procedure can be properly created and invoked even if only the output parameters of the stored procedure are different. Currently, this parameter can be used only when gsql and JDBC are used to connect to the database. If this parameter is enabled for other tools to connect to the database, stored procedures with the out parameter cannot be invoked. It supports the functions that contain the out output parameter and returns data of the record type. Besides, a value is assigned to the out parameter. |
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proc_implicit_for_loop_variable |
Controls the behavior of the FOR_LOOP query statement in a stored procedure. When this parameter is set, if rec has been defined in the FOR rec IN query LOOP statement, the defined rec variable is not reused and a new variable is created. Otherwise, the defined rec variable is reused and no variable is created. |
||||
allow_procedure_compile_check |
Controls the compilation check of the SELECT and OPEN CURSOR statements in a stored procedure. If this parameter is set, when the SELECT, OPEN CURSOR FOR, CURSOR%rowtype, or FOR rec IN statement is executed in a stored procedure, the stored procedure cannot be created if the queried table does not exist, and the compilation check of the trigger function is not supported. If the queried table exists, the stored procedure is successfully created. Note: When creating an encrypted function, you need to disable allow_procedure_compile_check. |
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char_coerce_compat |
Controls the behavior when char(n) types are converted to other variable-length string types. If this parameter is not set, spaces at the end are omitted when the char(n) type is converted to other variable-length string types. If this parameter is set, spaces at the end are not omitted during conversion. In addition, if the length of the char(n) type exceeds the length of other variable-length string types, an error is reported. This parameter is valid only when the sql_compatibility parameter is set to A. After this parameter is enabled, spaces at the end are not omitted in implicit conversion, explicit conversion, or conversion by calling the text(bpchar) function. gaussdb=# set behavior_compat_options=''; gaussdb=# create table tab_1(col1 varchar(3)); gaussdb=# create table tab_2(col2 char(3)); gaussdb=# insert into tab_2 values(' '); gaussdb=# insert into tab_1 select col2 from tab_2; gaussdb=# select * from tab_1 where col1 is null; col1 ------ (1 row) gaussdb=# select * from tab_1 where col1=' '; col1 ------ (0 rows) gaussdb=# delete from tab_1; gaussdb=# set behavior_compat_options = 'char_coerce_compat'; gaussdb=# insert into tab_1 select col2 from tab_2; gaussdb=# select * from tab_1 where col1 is null; col1 ------ (0 rows) gaussdb=# select * from tab_1 where col1=' '; col1 ------ (1 row) |
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truncate_numeric_tail_zero |
Configuration item for numeric display. If this parameter is not set, numeric data is displayed in the default precision. When this parameter is set, the trailing zeros after the decimal point are hidden in all numeric output scenarios except to_char(numeric, format). For example: gaussdb=# set behavior_compat_options='truncate_numeric_tail_zero'; gaussdb=# select cast(123.123 as numeric(15,10)) as a, to_char(cast(123.123 as numeric(15,10)), '999D999999'); a | to_char ---------+------------- 123.123 | 123.123000 (1 row) gaussdb=# set behavior_compat_options=''; gaussdb=# select cast(123.123 as numeric(15,10)) as a, to_char(cast(123.123 as numeric(15,10)), '999D999999'); a | to_char ----------------+------------- 123.1230000000 | 123.123000 (1 row) |
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plsql_security_definer |
After this parameter is enabled, the definer permission is used by default when a stored procedure is created. |
||||
plpgsql_dependency |
If this parameter is set, a function, stored procedure, or package containing undefined objects can be created. You can query the dependency in GS_DEPENDENCIES and GS_DEPENDENCIES_OBJ. If this parameter is enabled, when creating a PL/SQL object, the OID that depends on the PL/SQL object is automatically updated.
Dependency can be established in the following scenarios:
Dependency cannot be established in the following scenarios:
Notes:
|
||||
disable_rewrite_nesttable |
If this parameter is enabled, rewriting of columns related to the tableof type in the pg_type table will be disabled. That is, when reading the pg_type table, the actual stored value of the tableof type is displayed. |
||||
skip_insert_gs_source |
If this parameter is enabled, data is not inserted into the dbe_pldeveloper.gs_source table when the PL/SQL objects are created. |
||||
disable_emptystr2null |
If this parameter is enabled, the function of converting empty strings to null by default is disabled for the following character types: text, clob, blob, raw, bytea, varchar, nvarchar2, bpchar, char, name, byteawithoutorderwithqualcol, and byteawithoutordercol. This parameter is reserved for emergency. Do not set it unless necessary. |
||||
select_into_return_null |
This parameter takes effect only in PG-compatible mode. If this parameter is enabled, a NULL value can be assigned to the variables in the stored procedure statement SELECT select_expressions INTO [STRICT] target FROM... without specifying STRICT when the query result is empty. |
||||
proc_uncheck_default_param |
When a function is called, the system does not check whether the default parameter is omitted.
|
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dynamic_sql_compat |
After this parameter is enabled, the dynamic statement does not consider the template parameters with the same name in the template SQL statement as the same variable. Instead, the variables in the USING clause are matched in sequence.
CAUTION:
|
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dynamic_sql_check |
If this parameter is enabled, an error is reported during dynamic statement execution if the number of different template parameters in the dynamic statement template SQL is different from the number of variables in the USING clause.
CAUTION:
|
||||
enable_funcname_with_argsname |
If the parameter is enabled, the projection alias displays the complete function when the SELECT function is invoked.
|
||||
allow_rownum_alias |
After this parameter is enabled, ROWNUM can be used as a column alias in SQL statements using the AS syntax. ROWNUM is used as a common identifier and cannot be used as a pseudocolumn.
WARNING:
You are not advised to change the status of this parameter during service execution. When the parameter is enabled, database objects (such as table names, column names, and database names) created using ROWNUM as the name in the database can be used only when the parameter is enabled. Otherwise, ambiguity occurs and the behavior is unpredictable. When the parameter is disabled, the behavior of using ROWNUM as a pseudocolumn in the database becomes invalid after the parameter is enabled and the behavior is unpredictable. |
||||
current_sysdate |
If this parameter is enabled, the current OS time is returned when the sysdate command is executed. gaussdb=# set behavior_compat_options='current_sysdate'; SET gaussdb=# select sysdate; current_sysdate --------------------- 2023-06-20 20:15:27 (1 row) |
plsql_compile_check_options
Parameter description: Specifies database compatibility behavior. Multiple items are separated by commas (,).
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: ""
- Currently, only items in Table 2 are supported.
- Multiple items are separated by commas (,), for example, set plsql_compile_check_options='for_loop,outparam';.
Configuration Item |
Behavior |
---|---|
for_loop |
Determines the behavior of the FOR_LOOP query statement in a stored procedure. When this parameter is set, if rec has been defined in the FOR rec IN query LOOP statement, the defined rec variable is not reused and a new variable is created. Otherwise, the defined rec variable is reused and no new variable is created. (It is the same as proc_implicit_for_loop_variable and will be incorporated later.) |
outparam |
When the output parameter overloading condition is met, the output parameters are checked. If the output parameters are constant, an error is reported. |
plsql_expression_check |
When the compilation check mode and this parameter are enabled, the output parameter type is checked additionally. If a value cannot be assigned for the output parameter, a warning is reported. |
a_format_version
Parameter description: Specifies the database platform compatibility configuration item. The value of this parameter is an enumerated string.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: ""
- Currently, only items in Table 2 are supported.
- Set a character string for the compatibility configuration item, for example, set a_format_version='10c'.
Configuration Item |
Behavior |
---|---|
10c |
Compatible version of platform A |
a_format_dev_version
Parameter description: Specifies the database platform minor version compatibility configuration item. The value of this parameter is an enumerated string.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: ""
- Currently, only items in Table 5 are supported.
- Set a character string for the compatibility configuration item, for example, set a_format_dev_version='s1'.
Configuration Item |
Behavior |
---|---|
s1 |
|
s2 |
|
plpgsql.variable_conflict
Parameter description: Sets the priority of using stored procedure variables and table columns with the same name.
This is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: a string
- error indicates that a compilation error is reported when the name of a stored procedure variable is the same as that of a table column.
- use_variable indicates that if the name of a stored procedure variable is the same as that of a table column, the variable is used preferentially.
- use_column indicates that if the name of a stored procedure variable is the same as that of a table column, the column name is used preferentially.
Default value: error
td_compatible_truncation
Parameter description: Specifies whether to enable features compatible with a Teradata database. You can set this parameter to on when connecting to a database compatible with the Teradata database, so that when you perform the INSERT operation, overlong strings are truncated based on the allowed maximum length before being inserted into char- and varchar-type columns in the target table. This ensures all data is inserted into the target table without errors reported.
The string truncation function cannot be used if the INSERT statement includes a foreign table.
If inserting multi-byte character data (such as Chinese characters) to database with the character set byte encoding (such as SQL_ASCII or LATIN1), and the character data crosses the truncation position, the string is truncated based on its bytes instead of characters. Unexpected result will occur in tail after the truncation. If you want correct truncation result, you are advised to adopt encoding set such as UTF8, which has no character data crossing the truncation position.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that overlong strings are truncated.
- off indicates that overlong strings are not truncated.
Default value: off
uppercase_attribute_name
Parameter description: Specifies whether to return column names in uppercase to the client. This parameter is used only in the ORA-compatible mode and centralized environment.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that column names are returned to the client in uppercase.
- off indicates that column names are not returned to the client in uppercase.
Default value: off
lastval_supported
Parameter description: Specifies whether the lastval function can be used.
This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- on indicates that the lastval function can be used and the nextval function cannot be pushed down.
- off indicates that the lastval function cannot be used and the nextval function can be pushed down.
Default value: off
a_format_copy_version
Parameter description: Specifies the database platform minor version compatibility configuration item. The value of this parameter is an enumerated string.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1. When using gs_loader to import new features, you need to set the corresponding values.
Value range: a string
Default value: ''.
- Currently, only items in Table 6 are supported.
- Supports setting character string for compatibility configuration. For details, see section "Client Tools > gs_loader" in Tool Reference. You can set the a_format_copy_version parameter by using guc_param.
Configuration Item |
Behavior |
---|---|
s1 |
|
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