System Operation

GaussDB(DWS) runs SQL statements to perform different system operations, such as setting variables, displaying the execution plan, and collecting garbage data.

Setting Variables

For details about how to set various parameters for a session or transaction, see SET.

Displaying the Execution Plan

For details about how to display the execution plan that GaussDB(DWS) makes for SQL statements, see EXPLAIN.

Specifying a Checkpoint in Transaction Logs

By default, WALs periodically specify checkpoints in a transaction log. CHECKPOINT forces an immediate checkpoint when the related command is issued, without waiting for a regular checkpoint scheduled by the system. For details, see CHECKPOINT.

Collecting Unnecessary Data

For details about how to collect garbage data and analyze a database as required, For details, see VACUUM.

Collecting statistics

For details about how to collect statistics on tables in databases, For details, see ANALYZE | ANALYSE.

Setting the Constraint Check Mode for the Current Transaction

For details about how to set the constraint check mode for the current transaction, For details, see SET CONSTRAINTS.

Previous topic: Limitations

Next topic: Transaction Management

Feedback

Was this page helpful?

Helpful Not helpful

Provide feedback

Thank you very much for your feedback. We will continue working to improve the documentation.

The system is busy. Please try again later.

Which of the following issues have you encountered?

Content is inconsistent with the product UI

Unclear descriptions

Lack of examples or code

Incorrect steps

Can't find what I need

Lack of best practices

Feedback (optional)

0/500

Select at least one type of issue, and enter your comments or suggestions.

Enter a maximum of 500 characters.

Submit Cancel