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doc: warn pg_stat_reset() can cause vacuum/analyze problems 

The fix is to run ANALYZE.

Discussion: https://postgr.es/m/YzRr+ys98UzVQJvK@momjian.us,
   https://postgr.es/m/flat/CAKJS1f8DTbCHf9gedU0He6ARsd58E6qOhEHM1caomqj_r9MOiQ%40mail.gmail.com,
   https://postgr.es/m/CAKJS1f80o98hcfSk8j%3DfdN09S7Sjz%2BvuzhEwbyQqvHJb_sZw0g%40mail.gmail.com

Backpatch-through: 10
This commit is contained in:
Bruce Momjian 2022-10-17 15:07:03 -04:00
parent b21615d1e9
commit bed9bb929e
1 changed files with 11 additions and 0 deletions
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doc/src/sgml/monitoring.sgml
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@ -4728,6 +4728,17 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
</tgroup>
</table>
<warning>
<para>
Using <function>pg_stat_reset()</function> also resets counters that
autovacuum uses to determine when to trigger a vacuum or an analyze.
Resetting these counters can cause autovacuum to not perform necessary
work, which can cause problems such as table bloat or out-dated
table statistics. A database-wide <command>ANALYZE</command> is
recommended after the statistics have been reset.
</para>
</warning>
<para>
<function>pg_stat_get_activity</function>, the underlying function of
the <structname>pg_stat_activity</structname> view, returns a set of records