From 26928441cbb4995fa1474c861d26d3318c8923f3 Mon Sep 17 00:00:00 2001
From: Michael Paquier
Date: Sat, 25 Sep 2021 15:12:07 +0900
Subject: doc: Improve description of index vacuuming with GUCs

Index vacuums may happen multiple times depending on the number of dead
tuples stored, as of maintenance_work_mem for a manual VACUUM.  For
autovacuum, this is controlled by autovacuum_work_mem instead, if set.
The documentation mentioned the former, but not the latter in the
context of autovacuum.

Reported-by: Nikolai Berkoff
Author: Laurenz Albe, Euler Taveira
Discussion: https://postgr.es/m/161545365522.10134.12195402324485546870@wrigleys.postgresql.org
Backpatch-through: 9.6
---
 doc/src/sgml/monitoring.sgml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 32932475340..16c927fcef3 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -3512,8 +3512,9 @@ SELECT pg_stat_get_backend_pid(s.backendid) AS pid,
        <command>VACUUM</command> is currently vacuuming the indexes.  If a table has
        any indexes, this will happen at least once per vacuum, after the heap
        has been completely scanned.  It may happen multiple times per vacuum
-       if <xref linkend="guc-maintenance-work-mem"/> is insufficient to
-       store the number of dead tuples found.
+       if <xref linkend="guc-maintenance-work-mem"/> (or, in the case of autovacuum,
+       <xref linkend="guc-autovacuum-work-mem"/> if set) is insufficient to store
+       the number of dead tuples found.
      </entry>
     </row>
     <row>
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