From: | Muhammad Ikram <mmikram(at)gmail(dot)com> |
---|---|
To: | "Shenavai, Manuel" <manuel(dot)shenavai(at)sap(dot)com> |
Cc: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: autovacuum_vacuum_cost_delay |
Date: | 2024-07-09 13:42:11 |
Message-ID: | CAGeimVqLkSO-PQREPwCgfASz5ENXb9dzLcXNfypEx4J-SPO-DA@mail.gmail.com |
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Lists: | pgsql-general |
Hi Shenvail,
Based on what I could understand,
Lower value will cause more frequent run of Autovacuum. Will have
less delay between processing data chunks but will put more load on the I/O
system. Autovacuum tasks will complete faster. Cleanup of dead tuples and
blots will be quicker thus increasing performance in the cases where tables
are heavily updated/deleted.
Higher values will result in longer delays between processing data chunks
thus slowing down the completion of autovacuum tasks. Autovacuum will have
less I/O load for its tasks. Database performance will be degraded if
operations are more update/delete intensive. Dead tuples and bloat will
take longer to be cleaned up.
It can be beneficial for performance of other database operations,
especially if your system is I/O-bound. Can also be helpful when system
resources are less
Regards,
Muhammad Ikram
Bitnine Global.
On Tue, Jul 9, 2024 at 4:38 PM Shenavai, Manuel <manuel(dot)shenavai(at)sap(dot)com>
wrote:
> Hi everyone,
>
>
>
> We are doing some tests with different autovacuum settings.
>
>
>
> Looking at autovacuum_vacuum_cost_delay:
>
>
> https://www.postgresql.org/docs/current/runtime-config-autovacuum.html#GUC-AUTOVACUUM-VACUUM-COST-DELAY
>
>
>
> Can someone help to understand what a high or low value of this setting
> really means? Would it be OK to set this to 0? If not, why not?
>
>
>
> Thanks in advance &
> Best regards,
>
> Manuel
>
--
Muhammad Ikram
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