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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>CHECKPOINT</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="sql-call.html" title="CALL" /><link rel="next" href="sql-close.html" title="CLOSE" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">CHECKPOINT</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-call.html" title="CALL">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-close.html" title="CLOSE">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-CHECKPOINT"><div class="titlepage"></div><a id="id-1.9.3.49.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">CHECKPOINT</span></h2><p>CHECKPOINT — force a write-ahead log checkpoint</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
CHECKPOINT
</pre></div><div class="refsect1" id="id-1.9.3.49.5"><h2>Description</h2><p>
A checkpoint is a point in the write-ahead 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
<a class="xref" href="wal-configuration.html" title="29.4. WAL Configuration">Section 29.4</a> for more details about what happens
during a checkpoint.
</p><p>
The <code class="command">CHECKPOINT</code> 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
<a class="xref" href="runtime-config-wal.html#RUNTIME-CONFIG-WAL-CHECKPOINTS" title="19.5.2. Checkpoints">Section 19.5.2</a>).
<code class="command">CHECKPOINT</code> is not intended for use during normal
operation.
</p><p>
If executed during recovery, the <code class="command">CHECKPOINT</code> command
will force a restartpoint (see <a class="xref" href="wal-configuration.html" title="29.4. WAL Configuration">Section 29.4</a>)
rather than writing a new checkpoint.
</p><p>
Only superusers can call <code class="command">CHECKPOINT</code>.
</p></div><div class="refsect1" id="id-1.9.3.49.6"><h2>Compatibility</h2><p>
The <code class="command">CHECKPOINT</code> command is a
<span class="productname">PostgreSQL</span> language extension.
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