From: Bruce Momjian <bruce@momjian.us>
Date: Mon, 17 Oct 2022 19:07:02 +0000 (-0400)
Subject: doc:  warn pg_stat_reset() can cause vacuum/analyze problems
X-Git-Tag: REL_11_18~16
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5f9372028bd8e6b4f71425c1a64ec2cf528533b8;p=thirdparty%2Fpostgresql.git

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
---

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 9ba8eeea46b..87e2a91da51 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -3190,6 +3190,17 @@ 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