Re: Autovacuum------Doubts

From: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
To: jaya kumar <kumardba27(at)gmail(dot)com>
Cc: pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: Re: Autovacuum------Doubts
Date: 2024-04-08 16:21:32
Message-ID: CAMkU=1w9Zgxc6ZSPS1MN7W=psx7fpH-QYt=0c9gPYar3AK2gGA@mail.gmail.com
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On Mon, Apr 8, 2024 at 5:27 AM jaya kumar <kumardba27(at)gmail(dot)com> wrote:

>
> Hi Team,
>
> The below updated parameter value has been set currently in
> postgresql.conf file.
>
> autovacuum_analyze_threshold and autovacuum_vacuum_threshold both
> parameter values set from 50 to 20.
>
> Created one table with 100 records. First, we deleted 21 records. after an
> autovacuum does not happen automatically. After again I deleted another 20.
> Out of 100 we delectated 40 records then the autovacuum happened
> automatically. As per the configuration Autocacuum will automatically
> delete 21 records in the table but my case does not happen.
>

If you want vacuuming by autovacuum to be driven entirely by
autovacuum_vacuum_threshold, then you should set
autovacuum_vacuum_scale_factor to zero.

Cheers,

Jeff

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