Red Hat Database: SQL Guide and Reference
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CHECKPOINT

Name

CHECKPOINT -- Forces a transaction log checkpoint

Synopsis

CHECKPOINT

Description

Write-Ahead Logging (WAL) puts a checkpoint in the transaction log every so often. The CHECKPOINT command forces an immediate checkpoint when the command is issued, without waiting for a scheduled checkpoint.

A checkpoint is a point in the transaction log sequence at which all data files have been updated to reflect the information in the log. All data files will be flushed to disk.

Only superusers may call CHECKPOINT. The command is not intended for use during normal operation.

Notes

To adjust the automatic checkpoint interval, see the run-time configuration options CHECKPOINT_SEGMENTS and CHECKPOINT_TIMEOUT.

Refer to the Red Hat Database Administrator and User's Guide for more information on WAL and checkpoints.

Usage

To issue a checkpoint 
CHECKPOINT;

Compatibility

There is no CHECKPOINT statement in SQL92.

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