'\" t
.\"     Title: CHECKPOINT
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
.\"      Date: 2016
.\"    Manual: PostgreSQL 9.5.2 Documentation
.\"    Source: PostgreSQL 9.5.2
.\"  Language: English
.\"
.TH "CHECKPOINT" "5sql" "2016" "PostgreSQL 9.5.2" "PostgreSQL 9.5.2 Documentation"
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.SH "NAME"
CHECKPOINT \- force a transaction log checkpoint
.SH "SYNOPSIS"
.sp
.nf
CHECKPOINT
.fi
.SH "DESCRIPTION"
.PP
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
Section 29.4, \(lqWAL Configuration\(rq, in the documentation
for more details about what happens during a checkpoint\&.
.PP
The
\fBCHECKPOINT\fR
command forces an immediate checkpoint when the command is issued, without waiting for a regular checkpoint scheduled by the system (controlled by the settings in
Section 18.5.2, \(lqCheckpoints\(rq, in the documentation)\&.
\fBCHECKPOINT\fR
is not intended for use during normal operation\&.
.PP
If executed during recovery, the
\fBCHECKPOINT\fR
command will force a restartpoint (see
Section 29.4, \(lqWAL Configuration\(rq, in the documentation) rather than writing a new checkpoint\&.
.PP
Only superusers can call
\fBCHECKPOINT\fR\&.
.SH "COMPATIBILITY"
.PP
The
\fBCHECKPOINT\fR
command is a
PostgreSQL
language extension\&.