2001-01-24 CHECKPOINT SQL - Language Statements CHECKPOINT Force transaction log checkpoint CHECKPOINT Write-Ahead Logging (WAL) puts a checkpoint in the transaction log every 300 seconds by default. (This may be changed by the run-time configuration option CHECKPOINT_TIMEOUT.) The CHECKPOINT command forces a checkpoint at the point at which the command is issued. The next automatic checkpoint will still happen after the original cycle expires. 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. Refer to the PostgreSQL Administrator's Guide for more information about the WAL system. PostgreSQL Administrator's Guide The CHECKPOINT command is a PostgreSQL language extension.