CHECKPOINT — force a transaction log checkpoint
CHECKPOINT
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 Chapter 27, Reliability and the Write-Ahead Log for more information about the WAL system.
Only superusers may call CHECKPOINT
. The command is
not intended for use during normal operation.