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| author | Bruce Momjian <bruce@momjian.us> | 2022-10-17 15:07:03 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2022-10-17 15:07:03 -0400 |
| commit | bed9bb929e026b91a0c45cbf7e4ee1a8bfaaa70b (patch) | |
| tree | ed3a2a54aa7e9440d74bf0931ba6957097880907 | |
| parent | b21615d1e9b04d8098ec04abc32d308659085a45 (diff) | |
| download | postgresql-bed9bb929e026b91a0c45cbf7e4ee1a8bfaaa70b.tar.gz | |
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
| -rw-r--r-- | doc/src/sgml/monitoring.sgml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml index 93a84fe28b..cb912f60f7 100644 --- a/doc/src/sgml/monitoring.sgml +++ b/doc/src/sgml/monitoring.sgml @@ -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 |