doc: Improve description of index vacuuming with GUCs

Michael Paquier <michael@paquier.xyz>

Commit: 56dcf00b04b87bd616dfe230323c758eb9c40722
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-09-25T06:12:15Z
Releases: 9.6.24
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

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doc/src/sgml/monitoring.sgml modified +3 −2

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