redhat man page for checkpoint

CHECKPOINT(7)							   SQL Commands 						     CHECKPOINT(7)

NAME
       CHECKPOINT - force a transaction log checkpoint

SYNOPSIS
       CHECKPOINT

DESCRIPTION
       Write-Ahead  Logging  (WAL)  puts a checkpoint in the transaction log every so often. (To adjust the automatic checkpoint interval, see the
       run-time configuration options CHECKPOINT_SEGMENTS and CHECKPOINT_TIMEOUT.)  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. Refer to the PostgreSQL Administrator's Guide for more information about the WAL system.

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

SEE ALSO
       PostgreSQL Administrator's Guide

COMPATIBILITY
       The CHECKPOINT command is a PostgreSQL language extension.

SQL - Language Statements					    2002-11-22							     CHECKPOINT(7)