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From: Ron Johnson <[email protected]>
To: pgsql-general <[email protected]>
Subject: Re: Configure autovacuum
Date: Fri, 14 Jun 2024 05:17:36 -0400
Message-ID: <CANzqJaDcDunMABGpD9jF+F2-Ce_qch7Z0_KwJjarZ-_1Jo4pkQ@mail.gmail.com> (raw)
In-Reply-To: <AM9PR02MB7410C756DC2DFADC7B4E2DD6E8C22@AM9PR02MB7410.eurprd02.prod.outlook.com>
References: <AM9PR02MB7410C756DC2DFADC7B4E2DD6E8C22@AM9PR02MB7410.eurprd02.prod.outlook.com>

On Fri, Jun 14, 2024 at 2:20 AM Shenavai, Manuel <[email protected]>
wrote:

> Hi everyone,
>
>
>
> I would like to configure the autovacuum in a way that it runs very
> frequently (i.e. after each update-statement). I tried the following
> settings on my table:
>
> alter table mytable set (autovacuum_vacuum_scale_factor  = 0.0);
>
> alter table mytable set (autovacuum_vacuum_cost_delay  = 0.0);
>
> alter table mytable set (autovacuum_vacuum_cost_limit  = 10000);
>
> alter table mytable set (autovacuum_vacuum_threshold  = 1);
>
>
>
> I do a lot of updates on a single tuple and I would expect that the
> autovacuum would start basically after each update (due to
> autovacuum_vacuum_threshold=1). But the autovacuum is not running.
>

HOT is probably what you're looking for:
https://www.postgresql.org/docs/14/storage-hot.html

Presuming that the field you're updating is not indexed, and the table can
be exclusively locked for as long as it takes to rewrite it: give the table
"more space to work" in each page:
ALTER TABLE foo SET (fillfactor = 30);
VACUUM FULL foo;

Then you don't need to VACUUM soooo frequently.

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