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Add FLUSH_UNLOGGED option to CHECKPOINT command.

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This option, which is disabled by default, can be used to request
the checkpoint also flush dirty buffers of unlogged relations.  As
with the MODE option, the server may consolidate the options for
concurrently requested checkpoints.  For example, if one session
uses (FLUSH_UNLOGGED FALSE) and another uses (FLUSH_UNLOGGED TRUE),
the server may perform one checkpoint with FLUSH_UNLOGGED enabled.

Author: Christoph Berg <myon@debian.org>
Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
Discussion: https://postgr.es/m/aDnaKTEf-0dLiEfz%40msg.df7cb.de
This commit is contained in:
Nathan Bossart
2025-07-11 11:51:25 -05:00
parent 2f698d7f4b
commit 8d33fbacba
5 changed files with 35 additions and 5 deletions
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26
doc/src/sgml/ref/checkpoint.sgml
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@ -25,6 +25,7 @@ CHECKPOINT [ ( option [, ...] ) ]
<phrase>where <replaceable class="parameter">option</replaceable> can be one of:</phrase>
FLUSH_UNLOGGED [ <replaceable class="parameter">boolean</replaceable> ]
MODE { FAST | SPREAD }
</synopsis>
</refsynopsisdiv>
@ -76,6 +77,17 @@ CHECKPOINT [ ( option [, ...] ) ]
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>FLUSH_UNLOGGED</literal></term>
<listitem>
<para>
Normally, <command>CHECKPOINT</command> does not flush dirty buffers of
unlogged relations. This option, which is disabled by default, enables
flushing unlogged relations to disk.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>MODE</literal></term>
<listitem>
@ -93,6 +105,20 @@ CHECKPOINT [ ( option [, ...] ) ]
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">boolean</replaceable></term>
<listitem>
<para>
Specifies whether the selected option should be turned on or off.
You can write <literal>TRUE</literal>, <literal>ON</literal>, or
<literal>1</literal> to enable the option, and <literal>FALSE</literal>,
<literal>OFF</literal>, or <literal>0</literal> to disable it. The
<replaceable class="parameter">boolean</replaceable> value can also
be omitted, in which case <literal>TRUE</literal> is assumed.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>