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docs: Note the recovery_min_apply_delay bloats pg_wal. 

Those WAL files that we're waiting to apply have to be stored
somewhere.

Thom Brown

Discussion: http://postgr.es/m/CAA-aLv4SkJRK6GGcd0Axt8kt6_eWMEbtG7f8NJpFh+rNshtdNA@mail.gmail.com
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Robert Haas 2022-04-08 11:02:59 -04:00
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doc/src/sgml/config.sgml
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@ -4872,6 +4872,12 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
state, until the standby is promoted or triggered. After that the standby
will end recovery without further waiting.
</para>
<para>
WAL records must be kept on the standby until they are ready to be
applied. Therefore, longer delays will result in a greater accumulation
of WAL files, increasing disk space requirements for the standby's
<filename>pg_wal</filename> directory.
</para>
<para>
This parameter is intended for use with streaming replication deployments;
however, if the parameter is specified it will be honored in all cases