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doc: Add details about object "wal" in pg_stat_io

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This commit adds a short description of what kind of activity is tracked
in pg_stat_io for the object "wal", with a link pointing to the section
"WAL configuration" that has a lot of details on the matter.

This should perhaps have been added in a051e71e28a1, but things are what
they are.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/Z7RkQ0EfYaqqjgz/@ip-10-97-1-34.eu-west-3.compute.internal
This commit is contained in:
Michael Paquier 2025-02-20 14:16:23 +09:00
parent 2f70871c2b
commit 4538bd3f1d
1 changed files with 10 additions and 0 deletions
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doc/src/sgml/monitoring.sgml
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@ -2930,6 +2930,16 @@ description | Waiting for a newly initialized WAL file to reach durable storage
writer</literal>.
</para>
<para>
For the <varname>object</varname> <literal>wal</literal>,
<varname>fsyncs</varname> and <varname>fsync_time</varname> track the
fsync activity of WAL files done in <function>issue_xlog_fsync</function>.
<varname>writes</varname> and <varname>write_time</varname>
track the write activity of WAL files done in
<function>XLogWrite</function>.
See <xref linkend="wal-configuration"/> for more information.
</para>
<para>
<structname>pg_stat_io</structname> can be used to inform database tuning.
For example: