Aggressive vacuum frequency on a table

From: Simon Elbaz <elbazsimon9(at)gmail(dot)com>
To: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Aggressive vacuum frequency on a table
Date: 2023-02-16 09:58:56
Message-ID: CAPOUM=dDvfS02Ds-St+Arjm-ObJ2YhW6OS7yRZ++XKWGESJnSw@mail.gmail.com
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Hi list,

The PostgreSQL documentation says in
https://www.postgresql.org/docs/15/routine-vacuuming.html#VACUUM-FOR-STATISTICS
:

*The maximum time that a table can go unvacuumed is two billion
transactions minus the vacuum_freeze_min_age value at the time of the last
aggressive vacuum.*

*...*

*This implies that if a table is not otherwise vacuumed, autovacuum will be
invoked on it approximately once every autovacuum_freeze_max_age minus
vacuum_freeze_min_age transactions.*

From what I have understood, a table is eligible for aggressive vacuum when
it reaches vacuum_freeze_table_age.

Then each table row becomes eligible when it reaches vacuum_freeze_min_age.

The autovacuum frequency would be then *autovacuum_freeze_max_age minus
vacuum_freeze_table_age transactions* (and not *autovacuum_freeze_max_age
minus vacuum_freeze_min_age transactions).*

Thanks for any answer
Regards
Simon

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