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- 功能总览
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开发指南
-
开发指南(分布式_V2.0-8.x)
- 数据库系统概述
- 数据库安全
- 数据库使用入门
- 开发设计建议
-
应用程序开发教程
- 开发规范
- 获取驱动包
-
基于JDBC开发
- JDBC包、驱动类和环境类
- 开发流程
- 加载驱动
- 连接数据库
- 连接数据库(以SSL方式)
- 连接数据库(UDS方式)
- 连接数据库(以国密TLS方式)
- 执行SQL语句
- 处理结果集
- 关闭数据库连接
- 日志管理
- 示例:常用操作
- 示例:重新执行应用SQL
- 示例:逻辑复制代码示例
- 示例:不同场景下连接数据库参数配置
-
JDBC接口参考
- 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
- JDBC常用参数参考
- 常见问题处理
- JDBC数据类型映射关系
- 基于ODBC开发
- 基于libpq开发
- 基于Psycopg开发
- 基于ecpg开发
- 基于Go驱动开发
- 兼容性参考
- 调试
-
SQL调优指南
- Query执行流程
- SQL执行计划介绍
- 调优流程
- 更新统计信息
- 审视和修改表定义
- 典型SQL调优点
- 经验总结:SQL语句改写规则
- SQL调优关键参数调整
-
使用Plan Hint进行调优
- Plan Hint调优概述
- 指定Hint所处的查询块Queryblock
- Hint可以指定表的查询块名和schema名
- Join顺序的Hint
- Join方式的Hint
- 行数的Hint
- Stream方式的Hint
- Scan方式的Hint
- 子链接块名的hint
- 运行倾斜的Hint
- 参数化路径的Hint
- Hint的错误、冲突及告警
- Plan Hint实际调优案例
- 优化器GUC参数的Hint
- Custom Plan和Generic Plan选择的Hint
- 指定子查询不展开的Hint
- 指定不使用全局计划缓存的Hint
- 同层参数化路径的Hint
- 设置慢SQL管控规则的Hint
- 支持bitmapscan的Hint
- 连接时内表物化的Hint
- 指定agg算法的Hint
- 查询改写的Hint
- 指定Any子链接提升的Hint
- 指定扫描并行度的Hint
- 指定是否使用Semi Join的Hint
- 指定是否使用minmax优化的hint
- 指定是否使用partition-wise scan优化的hint
- 检查隐式转换的性能问题
- 使用向量化执行引擎进行调优
- 使用SQL PATCH进行调优
- 实际调优案例
-
SQL参考
- GaussDB SQL
- 关键字
- 数据类型
- 字符集与字符序
- 常量与宏
-
函数和操作符
- 逻辑操作符
- 比较操作符
- 字符处理函数和操作符
- 二进制字符串函数和操作符
- 位串函数和操作符
- 模式匹配操作符
- 数字操作函数和操作符
- 时间和日期处理函数和操作符
- 类型转换函数
- 几何函数和操作符
- 网络地址函数和操作符
- 文本检索函数和操作符
- JSON/JSONB函数和操作符
- HLL函数和操作符
- SEQUENCE函数
- 数组函数和操作符
- 范围函数和操作符
- 聚集函数
- 窗口函数
- 安全函数
- 账本数据库的函数
- 密态函数和操作符
- 返回集合的函数
- 条件表达式函数
- 系统信息函数
- 系统管理函数
- SPM计划管理函数
- 统计信息函数
- 触发器函数
- HashFunc函数
- 提示信息函数
- 故障注入系统函数
- 重分布函数
- 分布列推荐函数
- 其他系统函数
- 内部函数
- AI特性函数
- 敏感数据发现函数
- 动态数据脱敏函数
- 层次递归查询函数
- hotkey特性函数
- Global SysCache特性函数
- 数据损坏检测修复函数
- XML类型函数
- XMLTYPE类型函数
- 数据透视函数
- Global Plsql Cache特性函数
- 通用标识符函数
- SQL限流函数
- 多租数据库函数
- 废弃函数
- 表达式
- 伪列
- 类型转换
- 系统操作
- 事务控制
-
SQL语法
- SQL语法格式说明
- DCL语法一览表
- DDL语法一览表
- DML语法一览表
- 其他语法一览表
- Online DDL及其操作
-
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 FOREIGN TABLE
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER NODE
- ALTER NODE GROUP
- 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 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 FOREIGN TABLE
- 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 PACKAGE
- 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 TABLE PARTITION AS
- 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 EXTENSION
- DROP FOREIGN DATA WRAPPER
- 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 PACKAGE
- 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
- 附录
- 最佳实践
- 用户自定义函数
- 存储过程
- 自治事务
-
系统表和系统视图
- 系统表和系统视图概述
-
系统表
- 分区表
- 负载管理
- OLTP表压缩
- 密态等值查询
- 通信
- 账本数据库
- SPM计划管理
- AI
- 审计
- 用户和权限管理
- 连接和认证
- 动态脱敏
- DATABASE LINK
- 物化视图
- 逻辑解码
- 多租数据库
-
其他系统表
- GS_ASP
- PGXC_COPY_ERROR_LOG
- GS_DEPENDENCIES
- GS_DEPENDENCIES_OBJ
- GS_IMCV
- GS_GLOBAL_CONFIG
- GS_JOB_ATTRIBUTE
- GS_JOB_ARGUMENT
- 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_TS_DICT_DEFINITION
- 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_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_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
-
系统视图
-
分区表
- 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
- 负载管理
- OLTP表压缩
-
通信
- 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
-
段页式存储
- 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计划管理
- 审计
-
用户和权限管理
- 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
- GS_RLSPOLICIES
- PG_ROLES
- GS_ROLES
- PG_SECLABELS
- GS_SECLABELS
- PG_SHADOW
- GS_SHADOW
- PG_USER
- GS_USER
- PG_USER_MAPPINGS
- ROLE_ROLE_PRIVS
- ROLE_SYS_PRIVS
- ROLE_TAB_PRIVS
- 动态脱敏
- DATABASE LINK
- 物化视图
- 多租数据库
-
其他系统视图
- 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_IMCU_SLOT_STATUS
- GS_IMCV_STATUS
- GS_LOGICALSTANDBY_SKIP
- GS_LOGICALSTANDBY_SKIP_TRANSACTION
- GS_LSC_MEMORY_DETAIL
- GS_MY_PLAN_TRACE
- GS_SESSION_ALL_SETTINGS
- GS_SQL_COUNT
- 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_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_SESSION_IOSTAT
- PG_SETTINGS
- 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_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
-
分区表
-
Schema
- 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/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_WLMSTAT_COMPLEX_RUNTIME
- STATEMENT_HISTORY
- GLOBAL_SESSION_SQL_MEMORY
- SESSION_SQL_MEMORY
-
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
- Comm
-
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 Events
- Configuration
- Operator
- Workload Manager
- Global Plancache
- RTO & RPO
- AI Watchdog
- Trace Function
- 废弃
-
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
- DBE_PLDEVELOPER
-
配置运行参数
- 查看参数
- 设置参数
-
GUC参数说明
- GUC使用说明
- 文件位置
- 连接和认证
- 资源消耗
- 数据并行导入导出
- 预写式日志
- 双机复制
- 查询规划
- 错误报告和日志
- 告警上报
- 运行时统计
- 负载管理
- 自动清理
- 客户端连接缺省设置
- 锁管理
- 版本和平台兼容性
- 容错性
- 连接池参数
- 集群事务
- 双集群复制参数
- 开发人员选项
- 审计
- 事务监控
- CM相关参数
- GTM相关参数
- 升级参数
- 其它选项
- 等待事件
- Query
- 系统性能快照
- 黑匣子相关参数
- 安全配置
- HyperLogLog
- 用户自定义函数
- 定时任务
- 线程池
- 备份恢复
- Undo
- DCF参数设置
- 闪回相关参数
- 回滚相关参数
- AI特性
- Global SysCache参数
- 分布式备机读参数
- 备机数据修复
- 账本数据库参数
- 在线创建索引
- 在线DDL
- 数据生命周期管理-OLTP表压缩
- session级事务下推及相关参数
- Enhanced Toast
- 预留参数
-
FAQ
- GaussDB单表支持的最大列数?
- 如何查询分区表分区信息和索引信息?
- 什么是OID?
- 什么是UDF?
- GaussDB都有哪些通配符,如何使用?
- 数据库对象名称的长度是否有限制?
- 如何查看某张表创建时间?
- 如何并行创建索引?
- 如何创建自动递增列?
- GaussDB数据库能否通过SQL查询内存的使用情况?
- LIMIT 2、LIMIT 2,3、LIMIT 2 OFFSET 3的区别?
- 如何创建默认为当前时间的列?
- 如何判断字段是否为NULL?
- 如何获取当前连接数据库的用户名?
- 如何查询两个时间的时间差?
- SQL语言分为哪几类?
- 触发器的作用是什么?
- 数据库事务正确执行的四个特性是什么?
- GaussDB的DROP、TRUNCATE、DELETE这三种删除数据的方式主要区别是什么?
- GaussDB数据库一个汉字占几个字节?
- 唯一约束和唯一索引有什么区别?
- GaussDB如何创建弱口令?
- 什么是脏读、幻读、不可重复读?
- 什么是MVCC?
- 日期/时间类型哪些带时区,哪些不带时区?
- count(*)和count(column)的区别是什么?
- 空字符串和NULL的关系?
- WAL日志是什么,日志文件路径是什么?
- GaussDB中模式、用户和角色如何理解?
- GaussDB支持动态内存管理吗?
- 以pg_temp或pg_toast_temp开头的SCHEMA是什么?
- 函数和存储过程的区别是什么?
- 为什么REVOKE某个用户的CONNECT ON DATABASE权限后还可以登录数据库?
- 全表关联UPDATE时,如何提升效率?
- 使用LIKE进行模糊查找时如何忽略大小写?
- 在使用了字符串处理函数后查询就不使用索引,该如何处理?
- 为什么查询中无法识别表名或者列名?
- 如果建表时没有指定分布列,数据会怎么存储?
- 什么是数据倾斜,如何检查?
- 复制表适用于哪些场景?
-
开发指南(集中式_V2.0-8.x)
- 数据库系统概述
- 数据库安全
- 数据库使用入门
- 开发设计建议
-
应用程序开发教程
- GaussDB应用程序开发教程概述
- 开发规范
- 获取驱动包
-
基于JDBC开发
- 开发流程
- 开发步骤
- 典型应用开发示例
-
JDBC接口参考
- 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
- 基于ODBC开发
- 基于libpq开发
- 基于Psycopg开发
- 基于Go驱动开发
- 基于ecpg开发
- 兼容性参考
- 附录
-
SQL调优指南
- Query执行流程
- SQL执行计划介绍
- 调优流程
- 更新统计信息
- 审视和修改表定义
- 典型SQL调优点
- 经验总结:SQL语句改写规则
- SQL调优关键参数调整
-
使用Plan Hint进行调优
- Plan Hint调优概述
- 指定Hint所处于的查询块Queryblock
- Hint可以指定表的查询块名和schema名
- Join顺序的Hint
- Join方式的Hint
- 行数的Hint
- Stream方式的Hint
- Scan方式的Hint
- 子链接块名的Hint
- Hint的错误、冲突及告警
- 优化器GUC参数的Hint
- Custom Plan和Generic Plan选择的Hint
- 指定子查询不展开的Hint
- 指定不使用全局计划缓存的Hint
- 同层参数化路径的Hint
- 设置慢SQL管控规则的Hint
- 自适应计划选择的Hint
- 为子计划结果进行物化的Hint
- 支持bitmapscan的Hint
- 连接时内表物化的Hint
- 指定agg算法的Hint
- 查询改写的Hint
- Outline Hint
- 指定Any子链接提升的Hint
- 指定扫描并行度的Hint
- 指定是否使用Semi Join的Hint
- 指定Stream Hashagg优化方式的Hint
- 指定是否使用minmax优化的hint
- 指定是否使用Partition-wise Scan优化的hint
- 使用向量化执行引擎进行调优
- PLAN TRACE使用介绍
- 使用SQL PATCH进行调优
- 实际调优案例
-
SQL参考
- GaussDB SQL
- 关键字
- 数据类型
- 字符集与字符序
- 常量与宏
-
函数和操作符
- 逻辑操作符
- 比较操作符
- 字符处理函数和操作符
- 二进制字符串函数和操作符
- 位串函数和操作符
- 模式匹配操作符
- 数字操作函数和操作符
- 时间和日期处理函数和操作符
- 类型转换函数
- 几何函数和操作符
- 网络地址函数和操作符
- 文本检索函数和操作符
- JSON/JSONB函数和操作符
- HLL函数和操作符
- SEQUENCE函数
- 数组函数和操作符
- 范围函数和操作符
- 聚集函数
- 窗口函数
- 安全函数
- 账本数据库的函数
- 密态函数和操作符
- 返回集合的函数
- 条件表达式函数
- 系统信息函数
- 系统管理函数
- SPM计划管理函数
- 统计信息函数
- 触发器函数
- HashFunc函数
- 提示信息函数
- 全局临时表函数
- 故障注入系统函数
- AI特性函数
- 敏感数据发现函数
- 动态数据脱敏函数
- 层次递归查询函数
- 其他系统函数
- 内部函数
- Global SysCache特性函数
- 数据损坏检测修复函数
- XML类型函数
- XMLTYPE类型函数
- Global Plsql Cache特性函数
- 数据透视函数
- 通用标识符函数
- SQL限流函数
- 向量数据库函数与操作符
- 多租数据库函数
- 废弃函数
- 表达式
- 伪列
- 类型转换
- 系统操作
- 事务控制
-
SQL语法
- SQL语法格式说明
- DCL语法一览表
- DDL语法一览表
- DML语法一览表
- 其他语法一览表
- Online DDL及其操作
-
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 FOREIGN TABLE
- ALTER FUNCTION
- ALTER GLOBAL CONFIGURATION
- ALTER GROUP
- ALTER INDEX
- ALTER LANGUAGE
- ALTER MASKING POLICY
- ALTER MATERIALIZED VIEW
- ALTER OPERATOR
- ALTER PACKAGE
- ALTER PLUGGABLE DATABASE
- 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 SYSTEM SET
- 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 FOREIGN TABLE
- 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 PLUGGABLE DATABASE
- 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 TABLE PARTITION | SUBPARTITION AS
- 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 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 PLUGGABLE DATABASE INCLUDING DATAFILES
- 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
- 附录
- 最佳实践
- 用户自定义函数
- 存储过程
- 自治事务
-
系统表和系统视图
- 系统表和系统视图概述
-
系统表
- 分区表
- 负载管理
- OLTP表压缩
- 密态等值查询
- 通信
- 账本数据库
- SPM计划管理
- AI
- 审计
- 用户和权限管理
- 连接和认证
- 动态脱敏
- DATABASE LINK
- 物化视图
- 逻辑解码
- 多租数据库
-
其他系统表
- GS_ASP
- gs_copy_summary
- PGXC_COPY_ERROR_LOG
- GS_DEP_SOURCE
- GS_DEPENDENCIES
- GS_DEPENDENCIES_OBJ
- GS_GLOBAL_CONFIG
- GS_IMCV
- 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_TS_DICT_DEFINITION
- 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_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_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
-
系统视图
-
分区表
- 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
- 负载管理
- OLTP表压缩
- 通信
- 段页式存储
- SPM计划管理
- 审计
-
用户和权限管理
- 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
- GS_RLSPOLICIES
- PG_ROLES
- GS_ROLES
- PG_SECLABELS
- GS_SECLABELS
- PG_SHADOW
- GS_SHADOW
- PG_USER
- GS_USER
- PG_USER_MAPPINGS
- ROLE_ROLE_PRIVS
- ROLE_SYS_PRIVS
- ROLE_TAB_PRIVS
- 动态脱敏
- DATABASE LINK
- 物化视图
- 多租数据库
-
其他系统视图
- 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_IMCU_SLOT_STATUS
- GS_IMCV_STATUS
- GS_INSTANCE_TIME
- GS_LOGICALSTANDBY_SKIP
- GS_LOGICALSTANDBY_SKIP_TRANSACTION
- 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_SESSION_IOSTAT
- 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
-
分区表
-
Schema
- 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
- PDB Info
- 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_USER_COMPLEX_HISTORY
- STATEMENT_COMPLEX_RUNTIME
- STATEMENT_COMPLEX_HISTORY_TABLE
- STATEMENT_COMPLEX_HISTORY
- STATEMENT_WLMSTAT_COMPLEX_RUNTIME
- STATEMENT_HISTORY
- GLOBAL_SLOW_QUERY_HISTORY
- GLOBAL_SLOW_QUERY_INFO
- SESSION_SQL_MEMORY
-
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
- Trace Function
-
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
-
配置运行参数
- 查看参数
- 设置参数
-
GUC参数说明
- GUC使用说明
- 文件位置
- 连接和认证
- 资源消耗
- 数据导入导出
- 预写式日志
- 双机复制
- 查询规划
- SPM计划管理
- 错误报告和日志
- 告警上报
- 运行时统计
- 负载管理
- 自动清理
- 客户端连接缺省设置
- 锁管理
- 版本和平台兼容性
- 容错性
- 连接池参数
- 事务
- 双数据库实例复制参数
- 开发人员选项
- 审计
- CM相关参数
- 升级参数
- 其它选项
- 等待事件
- Query
- 系统性能快照
- 黑匣子相关参数
- 安全配置
- 全局临时表
- HyperLogLog
- 用户自定义函数
- 定时任务
- 线程池
- 备份恢复
- Undo
- DCF参数设置
- 闪回相关参数
- 回滚相关参数
- AI特性
- Global SysCache参数
- 备机数据修复
- 分隔符
- Global PLsql Cache特性参数
- 账本数据库参数
- 在线创建索引
- 在线DDL
- 数据生命周期管理-OLTP表压缩
- 向量数据库参数
- Enhanced Toast
- 应用无损透明
- 预留参数
- HTAP混合负载
- 多租数据库
-
FAQ
- GaussDB单表支持的最大列数?
- 如何查询分区表分区信息和索引信息?
- 什么是OID?
- 什么是UDF?
- GaussDB都有哪些通配符,如何使用?
- 数据库对象名称的长度是否有限制?
- 如何查看某张表创建时间?
- 如何并行创建索引?
- 如何创建自动递增列?
- GaussDB数据库能否通过SQL查询内存的使用情况?
- LIMIT 2、LIMIT 2,3、LIMIT 2 OFFSET 3的区别?
- 如何创建默认为当前时间的列?
- 如何判断字段是否为NULL?
- 如何获取当前连接数据库的用户名?
- 如何查询两个时间的时间差?
- SQL语言分为哪几类?
- 触发器的作用是什么?
- 数据库事务正确执行的四个特性是什么?
- GaussDB的DROP、TRUNCATE、DELETE这三种删除数据的方式主要区别是什么?
- GaussDB数据库一个汉字占几个字节?
- 如何设置账号的有效期?
- 唯一约束和唯一索引有什么区别?
- GaussDB如何创建弱口令?
- 什么是脏读、幻读、不可重复读?
- 什么是MVCC?
- 日期/时间类型哪些带时区,哪些不带时区?
- count(*)和count(column)的区别是什么?
- 空字符串和NULL的关系是什么?
- WAL日志是什么,日志文件路径是什么?
- GaussDB中模式、用户和角色如何理解?
- GaussDB支持动态内存管理吗?
- 以pg_temp或pg_toast_temp开头的SCHEMA是什么?
- 函数和存储过程的区别是什么?
- 为什么REVOKE某个用户的CONNECT ON DATABASE权限后还可以登录数据库?
- 全表关联UPDATE时,如何提升效率?
- 使用LIKE进行模糊查找时如何忽略大小写?
- 在使用了字符串处理函数后查询就不使用索引,该如何处理?
- 为什么查询中无法识别表名或者列名?
-
开发指南(分布式_V2.0-3.x)
- 数据库系统概述
- 数据库安全
- 数据库使用入门
- 开发设计建议
-
应用程序开发教程
- 开发规范
- 获取驱动包
-
基于JDBC开发
- 开发流程
- 开发步骤
- 典型应用开发示例
-
JDBC接口参考
- 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
- 基于ODBC开发
- 基于libpq开发
- 基于Psycopg开发
- 基于ecpg开发
- 基于Go驱动开发
- 附录
-
SQL调优指南
- Query执行流程
- SQL执行计划介绍
- 调优流程
- 更新统计信息
- 审视和修改表定义
- 典型SQL调优点
- 经验总结:SQL语句改写规则
- SQL调优关键参数调整
-
使用Plan Hint进行调优
- Plan Hint调优概述
- 指定Hint所处的查询块Queryblock
- Hint可以指定表的查询块名和schema名
- Join顺序的Hint
- Join方式的Hint
- 行数的Hint
- Stream方式的Hint
- Scan方式的Hint
- 子链接块名的hint
- 运行倾斜的hint
- 参数化路径的Hint
- Hint的错误、冲突及告警
- 优化器GUC参数的Hint
- Custom Plan和Generic Plan选择的Hint
- 指定子查询不展开的Hint
- 指定不使用全局计划缓存的Hint
- 同层参数化路径的Hint
- 设置慢SQL管控规则的Hint
- 支持bitmapscan的hint
- 连接时内表物化的Hint
- 指定agg算法的Hint
- 检查隐式转换的性能问题
- 使用SQL PATCH进行调优
- 实际调优案例
-
SQL参考
- SQL
- 关键字
- 数据类型
- 常量与宏
-
函数和操作符
- 逻辑操作符
- 比较操作符
- 字符处理函数和操作符
- 二进制字符串函数和操作符
- 位串函数和操作符
- 模式匹配操作符
- 数字操作函数和操作符
- 时间和日期处理函数和操作符
- 类型转换函数
- 几何函数和操作符
- 网络地址函数和操作符
- 文本检索函数和操作符
- JSON/JSONB函数和操作符
- HLL函数和操作符
- SEQUENCE函数
- 数组函数和操作符
- 范围函数和操作符
- 聚集函数
- 窗口函数
- 安全函数
- 密态函数和操作符
- 返回集合的函数
- 条件表达式函数
- 系统信息函数
- 系统管理函数
- 统计信息函数
- 触发器函数
- HashFunc函数
- 提示信息函数
- 故障注入系统函数
- 重分布函数
- 分布列推荐函数
- 其他系统函数
- 内部函数
- AI特性函数
- 动态数据脱敏函数
- hotkey特性函数
- Global SysCache特性函数
- 数据损坏检测修复函数
- XML类型函数
- XMLTYPE类型函数
- 废弃函数
- 表达式
- 伪列
- 类型转换
- 系统操作
- 事务控制
- DDL语法一览表
- DML语法一览表
- DCL语法一览表
-
SQL语法
- SQL语法格式说明
- 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
- 附录
- 最佳实践
- 用户自定义函数
- 存储过程
- 自治事务
-
系统表和系统视图
- 系统表和系统视图概述
-
系统表
- 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
-
系统视图
- 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
-
Schema
- 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
- SESSION_CPU_RUNTIME
- SESSION_MEMORY_RUNTIME
- LOCAL_ACTIVE_SESSION
- GLOBAL_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
- Comm
-
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 Events
- Configuration
- Operator
- Workload Manager
- Global Plancache
- RTO & RPO
- AI Watchdog
- 废弃
-
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
-
配置运行参数
- 查看参数
- 设置参数
- GUC参数说明
-
开发指南(集中式_V2.0-3.x)
- 数据库系统概述
- 数据库安全
- 数据库使用入门
- 开发设计建议
-
应用程序开发教程
- GaussDB应用程序开发教程
- 开发规范
- 驱动包获取
-
基于JDBC开发
- 开发流程
- 开发步骤
- 典型应用开发示例
-
JDBC接口参考
- 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
- 基于ODBC开发
- 基于libpq开发
- 基于Psycopg开发
- 基于Go驱动开发
- 基于ecpg开发
- 附录
-
SQL调优指南
- Query执行流程
- SQL执行计划介绍
- 调优流程
- 更新统计信息
- 审视和修改表定义
- 典型SQL调优点
- 经验总结:SQL语句改写规则
- SQL调优关键参数调整
-
使用Plan Hint进行调优
- Plan Hint调优概述
- 指定Hint所处于的查询块Queryblock
- Hint可以指定表的查询块名和schema名
- Join顺序的Hint
- Join方式的Hint
- 行数的Hint
- Stream方式的Hint
- Scan方式的Hint
- 子链接块名的hint
- Hint的错误、冲突及告警
- 优化器GUC参数的Hint
- Custom Plan和Generic Plan选择的Hint
- 指定子查询不展开的Hint
- 指定不使用全局计划缓存的Hint
- 同层参数化路径的Hint
- 设置慢SQL管控规则的Hint
- 自适应计划选择的Hint
- 为子计划结果进行物化的Hint
- 支持bitmapscan的hint
- 连接时内表物化的Hint
- 指定agg算法的Hint
- PLAN TRACE使用介绍
- 使用SQL PATCH进行调优
- 实际调优案例
-
SQL参考
- SQL
- 关键字
- 数据类型
- 常量与宏
-
函数和操作符
- 逻辑操作符
- 比较操作符
- 字符处理函数和操作符
- 二进制字符串函数和操作符
- 位串函数和操作符
- 模式匹配操作符
- 数字操作函数和操作符
- 时间和日期处理函数和操作符
- 类型转换函数
- 几何函数和操作符
- 网络地址函数和操作符
- 文本检索函数和操作符
- JSON/JSONB函数和操作符
- HLL函数和操作符
- SEQUENCE函数
- 数组函数和操作符
- 范围函数和操作符
- 聚集函数
- 窗口函数
- 安全函数
- 密态函数和操作符
- 返回集合的函数
- 条件表达式函数
- 系统信息函数
- 系统管理函数
- 统计信息函数
- 触发器函数
- HashFunc函数
- 提示信息函数
- 全局临时表函数
- 故障注入系统函数
- AI特性函数
- 动态数据脱敏函数
- 层次递归查询函数
- 内部函数
- Global SysCache特性函数
- 数据损坏检测修复函数
- XML类型函数
- XMLTYPE类型函数
- Global Plsql Cache特性函数
- 其他系统函数
- 废弃函数
- 表达式
- 伪列
- 类型转换
- 系统操作
- 事务控制
- DDL语法一览表
- DML语法一览表
- DCL语法一览表
-
SQL语法
- SQL语法格式说明
- 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
- 附录
- 最佳实践
- 用户自定义函数
- 存储过程
- 自治事务
-
系统表和系统视图
- 系统表和系统视图概述
-
系统表
- 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
-
系统视图
- 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
- 废弃
-
Schema
- 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
- 废弃
-
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
-
配置运行参数
- 查看参数
- 设置参数
-
GUC参数说明
- GUC使用说明
- 文件位置
- 连接和认证
- 资源消耗
- 数据导入导出
- 预写式日志
- 双机复制
- 查询规划
- 错误报告和日志
- 告警检测
- 运行时统计
- 自动清理
- 客户端连接缺省设置
- 锁管理
- 版本和平台兼容性
- 容错性
- 连接池参数
- 事务
- 双数据库实例复制参数
- 开发人员选项
- 审计
- CM相关参数
- 升级参数
- 其它选项
- 等待事件
- Query
- 系统性能快照
- 安全配置
- 全局临时表
- HyperLogLog
- 用户自定义函数
- 定时任务
- 线程池
- 备份恢复
- Undo
- DCF参数设置
- 闪回相关参数
- 回滚相关参数
- 预留参数
- AI特性
- Global SysCache参数
- 高效数据压缩算法相关参数
- 备机数据修复
- 分隔符
- Global PLsql Cache特性参数
-
开发指南(分布式_V2.0-2.x)
- 数据库系统概述
- 管理数据库安全
- 数据库使用入门
- 开发设计建议
-
应用程序开发教程
- 开发规范
- 驱动包获取
-
基于JDBC开发
- JDBC包、驱动类和环境类
- 开发流程
- 加载驱动
- 连接数据库
- 连接数据库(以SSL方式)
- 连接数据库(以UDS方式)
- 执行SQL语句
- 处理结果集
- 关闭数据库连接
- 日志管理
- 示例:常用操作
- 示例:重新执行应用SQL
- 示例:通过本地文件导入导出数据
- 示例:从MYSQL进行数据迁移
- 示例:逻辑复制代码示例
- 示例:不同场景下连接数据库参数配置
-
JDBC接口参考
- 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
- JDBC数据类型映射关系
- 常见问题处理
- 基于ODBC开发
- 基于libpq开发
- 基于Psycopg开发
- 调试
- SQL调优指南
-
SQL参考
- GaussDB SQL
- 关键字
- 数据类型
- 常量与宏
-
函数和操作符
- 逻辑操作符
- 比较操作符
- 字符处理函数和操作符
- 二进制字符串函数和操作符
- 位串函数和操作符
- 模式匹配操作符
- 数字操作函数和操作符
- 时间和日期处理函数和操作符
- 类型转换函数
- 几何函数和操作符
- 网络地址函数和操作符
- JSON/JSONB函数和操作符
- HLL函数和操作符
- SEQUENCE函数
- 数组函数和操作符
- 范围函数和操作符
- 聚集函数
- 窗口函数
- 安全函数
- 返回集合的函数
- 条件表达式函数
- 系统信息函数
- 系统管理函数
- 统计信息函数
- 触发器函数
- HashFunc函数
- 提示信息函数
- 故障注入系统函数
- 重分布函数
- 分布列推荐函数
- 其他系统函数
- 内部函数
- 动态数据脱敏函数
- hotkey特性函数
- Global SysCache特性函数
- 数据损坏检测修复函数
- 废弃函数
- 表达式
- 类型转换
- 系统操作
- 事务控制
- DDL语法一览表
- DML语法一览表
- DCL语法一览表
-
SQL语法
- ABORT
- ALTER AUDIT POLICY
- ALTER COORDINATOR
- ALTER DATABASE
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- 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 CONVERSION
- CREATE DATABASE
- CREATE DIRECTORY
- CREATE FUNCTION
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- 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 DATABASE
- DROP DIRECTORY
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- 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
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- INSERT
- LOCK
- MOVE
- MERGE INTO
- 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
- 附录
- 最佳实践
- 用户自定义函数
- 存储过程
- 自治事务
-
系统表和系统视图
- 系统表和系统视图概述
-
系统表
- GS_AUDITING_POLICY
- GS_AUDITING_POLICY_ACCESS
- GS_AUDITING_POLICY_FILTERS
- GS_AUDITING_POLICY_PRIVILEGES
- GS_ASP
- GS_DB_PRIVILEGE
- 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_OPT_MODEL
- GS_POLICY_LABEL
- GS_RECYCLEBIN
- GS_SQL_PATCH
- GS_TXN_SNAPSHOT
- GS_UID
- 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_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_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
- 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
-
系统视图
- ADM_COL_COMMENTS
- ADM_CONS_COLUMNS
- ADM_CONSTRAINTS
- ADM_DATA_FILES
- ADM_HIST_SNAPSHOT
- ADM_HIST_SQL_PLAN
- ADM_HIST_SQLSTAT
- ADM_IND_COLUMNS
- ADM_IND_EXPRESSIONS
- ADM_IND_PARTITIONS
- ADM_INDEXES
- ADM_OBJECTS
- ADM_PART_INDEXES
- ADM_PART_TABLES
- ADM_PROCEDURES
- ADM_SCHEDULER_JOBS
- ADM_SEQUENCES
- ADM_SOURCE
- ADM_SYNONYMS
- ADM_TAB_COLUMNS
- ADM_TAB_COMMENTS
- ADM_TAB_PARTITIONS
- ADM_TABLES
- ADM_TABLESPACES
- ADM_TRIGGERS
- ADM_TYPE_ATTRS
- ADM_USERS
- ADM_VIEWS
- COMM_CLIENT_INFO
- DB_ALL_TABLES
- DB_COL_COMMENTS
- DB_CONS_COLUMNS
- DB_CONSTRAINTS
- 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_TABLES
- DB_TRIGGERS
- DB_USERS
- DB_VIEWS
- DV_SESSION_LONGOPS
- DV_SESSIONS
- 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_SQL_COUNT
- GS_STAT_DB_CU
- GS_STAT_SESSION_CU
- GS_TOTAL_NODEGROUP_MEMORY_DETAIL
- GV_SESSION
- MPP_TABLES
- MY_COL_COMMENTS
- MY_CONS_COLUMNS
- MY_CONSTRAINTS
- MY_IND_COLUMNS
- MY_IND_EXPRESSIONS
- MY_IND_PARTITIONS
- MY_INDEXES
- 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_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_ORIGIN_STATUS
- PG_REPLICATION_SLOTS
- PG_RLSPOLICIES
- PG_ROLES
- PG_RULES
- PG_RUNNING_XACTS
- PG_SECLABELS
- 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_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_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
- SYS_DUMMY
-
Schema
- 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
- 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/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
- Comm
-
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 Events
- Configuration
- Operator
- Global Plancache
- RTO & RPO
- 逻辑复制
- GTM模式
- 物化视图
- 错误日志信息参考
- 配置运行参数
-
开发指南(集中式_V2.0-2.x)
- 数据库系统概述
- 管理数据库安全
- 数据库使用入门
- 开发设计建议
-
应用程序开发教程
- GaussDB应用程序开发教程概述
- 开发规范
- 驱动包获取
-
基于JDBC开发
- 开发流程
- 开发步骤
- 典型应用开发示例
-
JDBC接口参考
- 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
- 基于ODBC开发
- 基于libpq开发
- 基于Psycopg开发
- 基于Go驱动开发
- 附录
- SQL调优指南
-
SQL参考
- GaussDB SQL
- 关键字
- 数据类型
- 常量与宏
-
函数和操作符
- 逻辑操作符
- 比较操作符
- 字符处理函数和操作符
- 二进制字符串函数和操作符
- 位串函数和操作符
- 模式匹配操作符
- 数字操作函数和操作符
- 时间和日期处理函数和操作符
- 类型转换函数
- 几何函数和操作符
- 网络地址函数和操作符
- JSON/JSONB函数和操作符
- HLL函数和操作符
- SEQUENCE函数
- 数组函数和操作符
- 范围函数和操作符
- 聚集函数
- 窗口函数
- 安全函数
- 返回集合的函数
- 条件表达式函数
- 系统信息函数
- 系统管理函数
- 统计信息函数
- 触发器函数
- HashFunc函数
- 提示信息函数
- 全局临时表函数
- 故障注入系统函数
- AI特性函数
- 动态数据脱敏函数
- 层次递归查询函数
- 其他系统函数
- 内部函数
- Global SysCache特性函数
- 数据损坏检测修复函数
- 废弃函数
- 表达式
- 类型转换
- 系统操作
- 事务控制
- DDL语法一览表
- DML语法一览表
- DCL语法一览表
-
SQL语法
- ABORT
- ALTER AGGREGATE
- ALTER AUDIT POLICY
- ALTER DATABASE
- ALTER DEFAULT PRIVILEGES
- ALTER DIRECTORY
- 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 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 CONVERSION
- CREATE DATABASE
- CREATE DIRECTORY
- CREATE FUNCTION
- CREATE GROUP
- CREATE INCREMENTAL MATERIALIZED VIEW
- CREATE INDEX
- CREATE LANGUAGE
- CREATE MASKING POLICY
- CREATE MATERIALIZED VIEW
- CREATE OPERATOR
- CREATE OPERATOR CLASS
- CREATE PACKAGE
- CREATE PROCEDURE
- CREATE RESOURCE LABEL
- 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 DATABASE
- DROP DIRECTORY
- DROP FUNCTION
- DROP GLOBAL CONFIGURATION
- DROP GROUP
- DROP INDEX
- DROP LANGUAGE
- DROP MASKING POLICY
- DROP MATERIALIZED VIEW
- DROP OPERATOR
- DROP OWNED
- DROP PACKAGE
- DROP PROCEDURE
- DROP RESOURCE LABEL
- 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
- EXPLAIN
- EXPLAIN PLAN
- FETCH
- GRANT
- INSERT
- LOCK
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系统表和系统视图
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系统表
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系统视图
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- PG_CURSORS
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- PG_TDE_INFO
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-
Schema
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DBE_PERF Schema
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Object
- STAT_USER_TABLES
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- STAT_SYS_INDEXES
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- STAT_ALL_TABLES
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- STAT_DATABASE
- SUMMARY_STAT_DATABASE
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- GLOBAL_STAT_XACT_ALL_TABLES
- STAT_XACT_SYS_TABLES
- SUMMARY_STAT_XACT_SYS_TABLES
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- SUMMARY_STAT_XACT_USER_TABLES
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- Workload
-
Session/Thread
- SESSION_STAT
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- Transaction
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-
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
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- SUMMARY_STATIO_ALL_SEQUENCES
- GLOBAL_STATIO_ALL_SEQUENCES
- GLOBAL_STAT_DB_CU
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-
Utility
- REPLICATION_STAT
- GLOBAL_REPLICATION_STAT
- REPLICATION_SLOTS
- GLOBAL_REPLICATION_SLOTS
- BGWRITER_STAT
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DBE_PLDEBUGGER Schema
- DBE_PLDEBUGGER.turn_on
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- DBE_PLDEBUGGER.set_var
- DBE_PLDEVELOPER
- DBE_SQL_UTIL Schema
- 逻辑复制
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- 错误日志信息参考
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开发指南(分布式_V2.0-8.x)
- 工具参考
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特性指南
- 特性指南(分布式_V2.0-8.x)
- 特性指南(集中式_V2.0-8.x)
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- 特性指南(集中式_V2.0-3.x)
- 最佳实践
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常见问题
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产品咨询
- 使用GaussDB要注意些什么
- 什么是GaussDB实例可用性
- GaussDB实例是否会受其他用户实例的影响
- 为何使用了GaussDB后网站登录较慢
- 多台弹性云服务器是否可以连接同一个GaussDB数据库
- 购买GaussDB实例后可以对磁盘进行加密吗
- GaussDB购买磁盘加密后,备份文件会加密吗
- 不同GaussDB实例的CPU和内存是否共享
- GaussDB实例内能运行多少个数据库
- GaussDB与PostgreSQL的关系
- 使用DAS登录GaussDB数据库是否有人数限制,密码多次输入错误有无锁死机制
- GaussDB分布式独立部署与分布式混合部署有什么区别
- GaussDB通用型、独享型和鲲鹏独享型性能规格之间的区别是什么
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数据库参数修改
- GaussDB如何修改时区
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- GaussDB是否支持使用SQL命令修改全局参数
- GaussDB是否支持开启SELECT审计功能
- GaussDB如何设置磁盘占用率只读检测阈值
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展开导读
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聚集函数
聚集函数
- sum(expression)
返回类型:
通常情况下输入数据类型和输出数据类型是相同的,但以下情况会发生类型转换:
- 对于SMALLINT或INT输入,输出类型为BIGINT。
- 对于BIGINT输入,输出类型为NUMBER 。
- 对于浮点数输入,输出类型为DOUBLE PRECISION。
示例:
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gaussdb=# CREATE TABLE tab(a int); CREATE TABLE gaussdb=# INSERT INTO tab values(1); INSERT 0 1 gaussdb=# INSERT INTO tab values(2); INSERT 0 1 gaussdb=# SELECT sum(a) FROM tab; sum ----- 3 (1 row)
- max(expression)
参数类型:任意数组、数值、字符串、日期/时间类型。
返回类型:与参数数据类型相同
示例:
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gaussdb=# CREATE TABLE max_t1(a int, b int); gaussdb=# INSERT INTO max_t1 VALUES(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT MAX(a) FROM max_t1; max ----- 4 (1 row) gaussdb=# DROP TABLE max_t1;
- min(expression)
参数类型:任意数组、数值、字符串、日期/时间类型。
返回类型:与参数数据类型相同
示例:
1 2 3 4 5 6 7 8 9 10 11
gaussdb=# CREATE TABLE min_t1(a int, b int); gaussdb=# INSERT INTO min_t1 VALUES(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT MIN(a) FROM min_t1; min ----- 1 (1 row) gaussdb=# DROP TABLE min_t1;
- avg(expression)
返回类型:
对于任何整数类型输入,结果都是NUMBER类型。
对于任何浮点输入,结果都是DOUBLE PRECISION类型。
否则和输入数据类型相同。
示例:
1 2 3 4 5 6 7 8 9 10 11
gaussdb=# CREATE TABLE avg_t1(a int, b int); gaussdb=# INSERT INTO avg_t1 VALUES(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT AVG(a) FROM avg_t1; avg -------------------- 2.5000000000000000 (1 row) gaussdb=# DROP TABLE avg_t1;
- count(expression)
返回类型:BIGINT
支持对XML类型数据操作。
示例:
1 2 3 4 5 6 7 8 9 10 11
gaussdb=# CREATE TABLE count_t1(a int, b int); gaussdb=# INSERT INTO count_t1 VALUES (NULL,1),(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT COUNT(a) FROM count_t1; count ------- 4 (1 row) gaussdb=# DROP TABLE count_t1;
- count(*)
返回类型:BIGINT
支持对XML类型数据操作。
示例:
1 2 3 4 5 6 7 8 9 10 11
gaussdb=# CREATE TABLE count_t1(a int, b int); gaussdb=# INSERT INTO count_t1 VALUES (NULL,1),(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT COUNT(*) FROM count_t1; count ------- 5 (1 row) gaussdb=# DROP TABLE count_t1;
- array_agg(expression)
返回类型:参数类型的数组
支持对XML类型数据操作。
示例:
1 2 3 4 5 6 7 8 9 10 11
gaussdb=# CREATE TABLE array_agg_t1(a int, b int); gaussdb=# INSERT INTO array_agg_t1 VALUES (NULL,1),(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT ARRAY_AGG(a) FROM array_agg_t1; array_agg ---------------- {NULL,1,2,3,4} (1 row) gaussdb=# DROP TABLE array_agg_t1;
- string_agg(expression, delimiter)
返回类型:和参数数据类型相同。
支持对显示转换成字符类型后的XML类型数据操作。
示例:
1 2 3 4 5 6 7 8 9 10 11
gaussdb=# CREATE TABLE string_agg_t1(a int, b int); gaussdb=# INSERT INTO string_agg_t1 VALUES (NULL,1),(1,2),(2,3),(3,4),(4,5); gaussdb=# SELECT STRING_AGG(a,';') FROM string_agg_t1; string_agg ------------ 1;2;3;4 (1 row) gaussdb=# DROP TABLE string_agg_t1;
- listagg(expression [, delimiter]) WITHIN GROUP(ORDER BY order-list)
描述:将聚集列数据按WITHIN GROUP指定的排序方式排列,并用delimiter指定的分隔符拼接成一个字符串。
- expression:必选。指定聚集列名或基于列的有效表达式,不支持DISTINCT关键字和VARIADIC参数。
- delimiter:可选。指定分隔符,可以是字符串常数或基于分组列的确定性表达式,缺省时表示分隔符为空。
- order-list:必选。指定分组内的排序方式。
返回类型:text
说明:
listagg是兼容Oracle 11g2的列转行聚集函数,可以指定OVER子句用作窗口函数。为了避免与函数本身WITHIN GROUP子句的ORDER BY造成二义性,listagg用作窗口函数时,OVER子句不支持ORDER BY的窗口排序或窗口框架。
示例:
聚集列是文本字符集类型。
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gaussdb=# CREATE TABLE listagg_t1(a int, b text); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,'a1'),(1,'b2'),(1,'c3'),(2,'d4'),(2,'e5'),(3,'f6'); gaussdb=# SELECT a,LISTAGG(b,';') WITHIN GROUP(ORDER BY b) FROM listagg_t1 group by a; a | listagg ---+--------- 1 | b2;c3 2 | d4;e5 3 | f6 | a1 (4 rows) gaussdb=# DROP TABLE listagg_t1;
聚集列是整型。
1 2 3 4 5 6 7 8 9 10 11 12 13 14
gaussdb=# CREATE TABLE listagg_t1(a int, b int); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,1),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT a,LISTAGG(b,';') WITHIN GROUP(ORDER BY b) FROM listagg_t1 group by a; a | listagg ---+--------- 1 | 2;3 2 | 4;5 3 | 6 | 1 (4 rows) gaussdb=# DROP TABLE listagg_t1;
聚集列是浮点类型。
1 2 3 4 5 6 7 8 9 10 11 12 13 14
gaussdb=# CREATE TABLE listagg_t1(a int, b float); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,1.111),(1,2.222),(1,3.333),(2,4.444),(2,5.555),(3,6.666); gaussdb=# SELECT a,LISTAGG(b,';') WITHIN GROUP(ORDER BY b) FROM listagg_t1 group by a; a | listagg ---+------------------- 1 | 2.222000;3.333000 2 | 4.444000;5.555000 3 | 6.666000 | 1.111000 (4 rows) gaussdb=# DROP TABLE listagg_t1;
聚集列是时间类型。
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gaussdb=# CREATE TABLE listagg_t1(a int, b timestamp); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,'2000-01-01'),(1,'2000-02-02'),(1,'2000-03-03'),(2,'2000-04-04'),(2,'2000-05-05'),(3,'2000-06-06'); gaussdb=# SELECT a,LISTAGG(b,';') WITHIN GROUP(ORDER BY b) FROM listagg_t1 group by a; a | listagg ---+----------------------------------------- 1 | 2000-02-02 00:00:00;2000-03-03 00:00:00 2 | 2000-04-04 00:00:00;2000-05-05 00:00:00 3 | 2000-06-06 00:00:00 | 2000-01-01 00:00:00 (4 rows) gaussdb=# DROP TABLE listagg_t1;
聚集列是时间间隔类型。
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gaussdb=# CREATE TABLE listagg_t1(a int, b interval); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,'1 days'),(1,'2 days'),(1,'3 days'),(2,'4 days'),(2,'5 days'),(3,'6 days'); gaussdb=# SELECT a,LISTAGG(b,';') WITHIN GROUP(ORDER BY b) FROM listagg_t1 group by a; a | listagg ---+--------------- 1 | 2 days;3 days 2 | 4 days;5 days 3 | 6 days | 1 day (4 rows) gaussdb=# DROP TABLE listagg_t1;
分隔符缺省时,默认为空。
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gaussdb=# CREATE TABLE listagg_t1(a int, b interval); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,'1 days'),(1,'2 days'),(1,'3 days'),(2,'4 days'),(2,'5 days'),(3,'6 days'); gaussdb=# SELECT a,LISTAGG(b) WITHIN GROUP(ORDER BY b) FROM listagg_t1 group by a; a | listagg ---+-------------- 1 | 2 days3 days 2 | 4 days5 days 3 | 6 days | 1 day (4 rows) gaussdb=# DROP TABLE listagg_t1;
listagg作为窗口函数时,OVER子句不支持ORDER BY的窗口排序,listagg列为对应分组的有序聚集。
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gaussdb=# CREATE TABLE listagg_t1(a int, b interval); gaussdb=# INSERT INTO listagg_t1 VALUES (NULL,'1 days'),(1,'2 days'),(1,'3 days'),(2,'4 days'),(2,'5 days'),(3,'6 days'); gaussdb=# SELECT a,LISTAGG(b) WITHIN GROUP(ORDER BY b) OVER(PARTITION BY a) FROM listagg_t1; a | listagg ---+-------------- 1 | 2 days3 days 1 | 2 days3 days 2 | 4 days5 days 2 | 4 days5 days 3 | 6 days | 1 day (6 rows) gaussdb=# DROP TABLE listagg_t1;
- wm_concat(expression)
返回类型:和参数数据类型相同。
说明:
wm_concat是ORA兼容性需求,目前ORA最新版本已经取消此函数,在ORA中目前使用listagg函数对功能进行替代。目前此函数功能可使用listagg函数或string_agg进行替代,使用具体方法见上述两函数描述。
- covar_pop(Y, X)
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE covar_pop_t1(a int, b int); gaussdb=# INSERT INTO covar_pop_t1 VALUES (NULL,11),(11,21),(11,31),(21,41),(21,51),(31,61); gaussdb=# SELECT COVAR_POP(a,b) FROM covar_pop_t1; covar_pop ----------- 100 (1 row) gaussdb=# DROP TABLE covar_pop_t1;
- covar_samp(Y, X)
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE covar_samp_t1(a int, b int); gaussdb=# INSERT INTO covar_samp_t1 VALUES (NULL,11),(11,21),(11,31),(21,41),(21,51),(31,61); gaussdb=# SELECT COVAR_SAMP(a,b) FROM covar_samp_t1; covar_samp ------------ 125 (1 row) gaussdb=# DROP TABLE covar_samp_t1;
- stddev_pop(expression)
返回类型:对于浮点类型的输入返回double precision,其他输入返回numeric。
示例:
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gaussdb=# CREATE TABLE stddev_pop_t1(a int, b int); gaussdb=# INSERT INTO stddev_pop_t1 VALUES (NULL,11),(11,21),(11,31),(21,41),(21,51),(31,61); gaussdb=# SELECT STDDEV_POP(a) FROM stddev_pop_t1; stddev_pop -------------------- 7.4833147735478828 (1 row) gaussdb=# DROP TABLE stddev_pop_t1;
- stddev_samp(expression)
返回类型:对于浮点类型的输入返回double precision,其他输入返回numeric。
示例:
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gaussdb=# CREATE TABLE stddev_samp_t1(a int, b int); gaussdb=# INSERT INTO stddev_samp_t1 VALUES (NULL,11),(11,21),(11,31),(21,41),(21,51),(31,61); gaussdb=# SELECT STDDEV_SAMP(a) FROM stddev_samp_t1; stddev_samp -------------------- 8.3666002653407555 (1 row) gaussdb=# DROP TABLE stddev_samp_t1;
- var_pop(expression)
返回类型:对于浮点类型的输入返回double precision类型,其他输入返回numeric类型。
示例:
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gaussdb=# CREATE TABLE var_pop_t1(a int, b int); gaussdb=# INSERT INTO var_pop_t1 VALUES (NULL,11),(11,21),(11,31),(21,41),(21,51),(31,61); gaussdb=# SELECT VAR_POP(a) FROM var_pop_t1; var_pop --------------------- 56.0000000000000000 (1 row) gaussdb=# DROP TABLE var_pop_t1;
- var_samp(expression)
返回类型:对于浮点类型的输入返回double precision类型,其他输入返回numeric类型。
示例:
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gaussdb=# CREATE TABLE var_samp_t1(a int, b int); gaussdb=# INSERT INTO var_samp_t1 VALUES (NULL,11),(11,21),(11,31),(21,41),(21,51),(31,61); gaussdb=# SELECT VAR_SAMP(a) FROM var_samp_t1; var_samp --------------------- 70.0000000000000000 (1 row) gaussdb=# DROP TABLE var_samp_t1;
- bit_and(expression)
描述:所有非NULL输入值的按位与(AND),如果全部输入值皆为NULL,那么结果也为NULL 。
返回类型:和参数数据类型相同。
示例:
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gaussdb=# CREATE TABLE bit_and_t1(a int, b int); gaussdb=# INSERT INTO bit_and_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT BIT_AND(a) FROM bit_and_t1; bit_and --------- 0 (1 row) gaussdb=# DROP TABLE bit_and_t1;
- bit_or(expression)
描述:所有非NULL输入值的按位或(OR),如果全部输入值皆为NULL,那么结果也为NULL。
返回类型:和参数数据类型相同
示例:
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gaussdb=# CREATE TABLE bit_or_t1(a int, b int); gaussdb=# INSERT INTO bit_or_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT BIT_OR(a) FROM bit_or_t1; bit_or -------- 3 (1 row) gaussdb=# DROP TABLE bit_or_t1;
- bool_and(expression)
返回类型:bool
示例:
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gaussdb=# SELECT bool_and(100 <2500); bool_and ---------- t (1 row)
- bool_or(expression)
返回类型:bool
示例:
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gaussdb=# SELECT bool_or(100 <2500); bool_or ---------- t (1 row)
- corr(Y, X)
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE corr_t1(a int, b int); gaussdb=# INSERT INTO corr_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT CORR(a,b) FROM corr_t1; corr ------------------ .944911182523068 (1 row) gaussdb=# DROP TABLE corr_t1;
- every(expression)
返回类型:bool
示例:
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gaussdb=# SELECT every(100 <2500); every ------- t (1 row)
- rank(expression)
描述:根据expression对不同组内的元组进行跳跃排序。
返回类型:BIGINT
示例:
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gaussdb=# CREATE TABLE rank_t1(a int, b int); gaussdb=# INSERT INTO rank_t1 VALUES(NULL,1),(1, 2),(1, 3),(2, 4),(2, 5),(3,6); gaussdb=# SELECT a,b,RANK() OVER(PARTITION BY a ORDER BY b) FROM rank_t1; a | b | rank ---+---+------ 1 | 2 | 1 1 | 3 | 2 2 | 4 | 1 2 | 5 | 2 3 | 6 | 1 | 1 | 1 (6 rows) gaussdb=# DROP TABLE rank_t1;
- regr_avgx(Y, X)
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_t1(a int, b int); gaussdb=# INSERT INTO regr_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_AVGX(a,b) FROM regr_t1; regr_avgx ----------- 4 (1 row) gaussdb=# DROP TABLE regr_t1;
- regr_avgy(Y, X)
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_avgy_t1(a int, b int); gaussdb=# INSERT INTO regr_avgy_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_AVGY(a,b) FROM regr_avgy_t1; regr_avgy ----------- 1.8 (1 row) gaussdb=# DROP TABLE regr_avgy_t1;
- regr_count(Y, X)
返回类型:bigint
示例:
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gaussdb=# CREATE TABLE regr_count_t1(a int, b int); gaussdb=# INSERT INTO regr_count_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_COUNT(a,b) FROM regr_count_t1; regr_count ------------ 5 (1 row) gaussdb=# DROP TABLE regr_count_t1;
- regr_intercept(Y, X)
描述:根据所有输入的点(X, Y)按照最小二乘法拟合成一个线性方程,然后返回该直线的Y轴截距。
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_intercept_t1(a int, b int); gaussdb=# INSERT INTO regr_intercept_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_INTERCEPT(b,a) FROM regr_intercept_t1; regr_intercept ------------------ .785714285714286 (1 row) gaussdb=# DROP TABLE regr_intercept_t1;
- regr_r2(Y, X)
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_r2_t1(a int, b int); gaussdb=# INSERT INTO regr_r2_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_R2(b,a) FROM regr_r2_t1; regr_r2 ------------------ .892857142857143 (1 row) gaussdb=# DROP TABLE regr_r2_t1;
- regr_slope(Y, X)
描述:根据所有输入的点(X, Y)按照最小二乘法拟合成一个线性方程, 然后返回该直线的斜率。
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_slope_t1(a int, b int); gaussdb=# INSERT INTO regr_slope_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_SLOPE(b,a) FROM regr_slope_t1; regr_slope ------------------ 1.78571428571429 (1 row) gaussdb=# DROP TABLE regr_slope_t1;
- regr_sxx(Y, X)
描述:sum(X^2) - sum(X)^2/N (自变量的“平方和”)。
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_sxx_t1(a int, b int); gaussdb=# INSERT INTO regr_sxx_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_SXX(b,a) FROM regr_sxx_t1; regr_sxx ---------- 2.8 (1 row) gaussdb=# DROP TABLE regr_sxx_t1;
- regr_sxy(Y, X)
描述:sum(X*Y) - sum(X) * sum(Y)/N (自变量和因变量的“乘方积”)。
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_sxy_t1(a int, b int); gaussdb=# INSERT INTO regr_sxy_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_SXY(b,a) FROM regr_sxy_t1; regr_sxy ---------- 5 (1 row) gaussdb=# DROP TABLE regr_sxy_t1;
- regr_syy(Y, X)
描述:sum(Y^2) - sum(Y)^2/N(因变量的"平方和")。
返回类型:double precision
示例:
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gaussdb=# CREATE TABLE regr_syy_t1(a int, b int); gaussdb=# INSERT INTO regr_syy_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT REGR_SYY(b,a) FROM regr_syy_t1; regr_syy ---------- 10 (1 row) gaussdb=# DROP TABLE regr_syy_t1;
- stddev(expression)
返回类型:对于浮点类型的输入返回double precision,其他输入返回numeric。
示例:
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gaussdb=# CREATE TABLE stddev_t1(a int, b int); gaussdb=# INSERT INTO stddev_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT STDDEV(a) FROM stddev_t1; stddev ----------------------- .83666002653407554798 (1 row) gaussdb=# DROP TABLE stddev_t1;
- variance(expexpression,ression)
返回类型:对于浮点类型的输入返回double precision类型,其他输入返回numeric类型。
示例:
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gaussdb=# CREATE TABLE variance_t1(a int, b int); gaussdb=# INSERT INTO variance_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT VARIANCE(a) FROM variance_t1; variance ----------------------- .70000000000000000000 (1 row) gaussdb=# DROP TABLE variance_t1;
- spread
参数:real
返回值类型:real
- pivot_func(anyelement)
描述:返回某列中唯一不为NULL的值,如果有超过两个非NULL值则报错。其中value为输入参数,可以为任意类型。
返回类型:与输入参数类型相同。
说明:
该聚合函数主要作为pivot语法内部使用。
gaussdb=# CREATE TABLE pivot_func_t1(a int, b int); gaussdb=# INSERT INTO pivot_func_t1 VALUES (NULL,11),(1,2); gaussdb=# SELECT PIVOT_FUNC(a) FROM pivot_func_t1; pivot_func ------------ 1 (1 row) gaussdb=# DROP TABLE pivot_func_t1;
- checksum(expression)
描述:返回所有输入值的CHECKSUM值。使用该函数可以用来验证GaussDB数据库(不支持GaussDB之外的其他数据库)的备份恢复或者数据迁移操作前后表中的数据是否相同。在备份恢复或者数据迁移操作前后都需要用户通过手工执行SQL命令的方式获取执行结果,通过对比获取的执行结果判断操作前后表中的数据是否相同。
说明:
- 对于大表,CHECKSUM函数可能会需要很长时间。
- 如果某两表的CHECKSUM值不同,则表明两表的内容是不同的。由于CHECKSUM函数中使用散列函数不能保证无冲突,因此两个不同内容的表可能会得到相同的CHECKSUM值,存在这种情况的可能性较小。对于列进行的CHECKSUM也存在相同的情况。
- 对于时间类型timestamp, timestamptz和smalldatetime,计算CHECKSUM值时请确保时区设置一致。
- 若计算某列的CHECKSUM值,且该列类型可以默认转为TEXT类型,则expression为列名。
- 若计算某列的CHECKSUM值,且该列类型不能默认转为TEXT类型,则expression为列名::TEXT。
- 若计算所有列的CHECKSUM值,则expression为表名::TEXT。
可以默认转换为TEXT类型的类型包括:char, name, int8, int2, int1, int4, raw, pg_node_tree, float4, float8, bpchar, varchar, nvarchar2, date, timestamp, timestamptz, numeric, smalldatetime,其他类型需要强制转换为TEXT,例如XML类型。
返回类型:numeric。
示例:
表中可以默认转为TEXT类型的某列的CHECKSUM值。
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gaussdb=# CREATE TABLE checksum_t1(a int, b int); gaussdb=# INSERT INTO checksum_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT CHECKSUM(a) FROM checksum_t1; checksum ------------- 18126842830 (1 row) gaussdb=# DROP TABLE checksum_t1;
表中不能默认转为TEXT类型的某列的CHECKSUM值。注意此时CHECKSUM参数是列名::TEXT。
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gaussdb=# CREATE TABLE checksum_t1(a int, b int); gaussdb=# INSERT INTO checksum_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT CHECKSUM(a::TEXT) FROM checksum_t1; checksum ------------- 18126842830 (1 row) gaussdb=# DROP TABLE checksum_t1;
表中所有列的CHECKSUM值。注意此时CHECKSUM参数是表名::TEXT,且表名前不加Schema。
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gaussdb=# CREATE TABLE checksum_t1(a int, b int); gaussdb=# INSERT INTO checksum_t1 VALUES (NULL,11),(1,2),(1,3),(2,4),(2,5),(3,6); gaussdb=# SELECT CHECKSUM(checksum_t1::TEXT) FROM checksum_t1; checksum ------------- 11160522226 (1 row) gaussdb=# DROP TABLE checksum_t1;