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Schemas

Updated on 2024-05-07 GMT+08:00

The following table describes the schemas supported in GaussDB.

NOTE:

Do not create service data of users in a schema that provides functional APIs, including but not limited to tables and functions (such as dbe_* and pkg_*).

Table 1 Schemas supported in GaussDB

Schema

Description

dbe_perf

In the DBE_PERF schema, views are used to diagnose performance issues and are also the data source of WDR snapshots. After a database is installed, only the initial user and monitoring administrator have permission to view views and functions in this schema by default.

snapshot

Manages data related to WDR snapshots. By default, the initial user or monitoring administrator can access the data.

sqladvsior

Recommends distribution keys. For details, see Distribution Key Recommendation Functions.

sys

Provides the system information view APIs.

pg_catalog

Maintains system catalog information, including system catalogs and all built-in data types, functions, and operators.

pg_toast

Stores large objects (for internal use).

public

Public schema, which is used to store public objects. If search_path is not specified and a schema with the same name exists, new tables (and other objects) are created in the schema by default. If no schema with the same name exists, new tables (and other objects) are automatically placed in this public schema.

dbe_raw

Advanced function package dbe_raw, which is used to convert raw data, obtain substrings, and calculate the length.

dbe_session

Advanced function package dbe_session, which is used to set the value of a specified attribute and support user query and verification.

dbe_lob

Advanced function package dbe_lob, which is used to read, write, and copy large files (CLOB/BLOB).

dbe_match

Advanced function package dbe_match, which is used to compare character string similarity.

dbe_task

Advanced function package dbe_task, which is used to schedule job tasks, including submitting tasks, canceling tasks, synchronizing task status, and updating task information, so that the database can periodically execute specific tasks.

dbe_sql

Advanced function package dbe_sql, which is used to execute dynamic SQL statements and construct query and other commands during application running.

dbe_file

Advanced function package dbe_file, which is used to read, copy, write, delete, and rename external database files.

dbe_output

Advanced function package dbe_output, which is used to print output information.

dbe_random

Advanced function package dbe_random, which is used to generate random seeds and random numbers.

dbe_application_info

Advanced function package dbe_application_info, which is used for recording client information.

dbe_utility

Advanced function package dbe_utility, which is used to call the debugging tool in a stored procedure, for example, to print error stacks.

dbe_scheduler

Advanced function package dbe_scheduler, which is used to create scheduled jobs and enable the database to periodically execute specified tasks through programs and schedules. You can also perform external database tasks by authorizing and providing certificates.

information_schema

Stores information about objects defined in the current database.

dbe_sql_util

SQL O&M function, including the O&M API of SQL patches.

Table 2 Schemas disabled in GaussDB

Schema

Description

dbe_pldebugger

This view is used to debug PL/SQL functions and stored procedures. Currently, this view is not supported. An error message "unsupported" is displayed when the API is called in this view.

db4ai

Manages data of different versions in AI training.

dbe_pldeveloper

Compiles and debugs user stored procedures.

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