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help / color / mirror / Atom feedFrom: Dimitrios Apostolou <[email protected]>
To: Ron Johnson <[email protected]>
Cc: [email protected]
Subject: Re: Why isn't my table auto-analyzed/vacuumed?
Date: Fri, 31 Oct 2025 21:03:39 +0100 (CET)
Message-ID: <[email protected]> (raw)
In-Reply-To: <CANzqJaDHcDE5j4bo+D7bH7A_GqtimbThRs5h+fnT+m829ZSsPQ@mail.gmail.com>
References: <[email protected]>
<CANzqJaDHcDE5j4bo+D7bH7A_GqtimbThRs5h+fnT+m829ZSsPQ@mail.gmail.com>
On Thursday 2025-10-30 18:00, Ron Johnson wrote:
>
> > SELECT reltuples FROM pg_class WHERE relname =
> 'test_runs_summarized_per_function' \gx
> -[ RECORD 1 ]-----------
> reltuples | 6.061923e+09
>
> > SELECT name,setting FROM pg_settings WHERE name ILIKE '%factor%' ;
> name | setting
> ---------------------------------------+---------
> autovacuum_analyze_scale_factor | 0.1
>
>
>0.1 means 10%.
>
> autovacuum_vacuum_insert_scale_factor | 0.2
> autovacuum_vacuum_scale_factor | 0.2
> recursive_worktable_factor | 10
>
>
>n_mod_since_analyze=423101205
>n_live_tup=6484485348
>
>n_mod_since_analyze/n_live_tup = 6.5%
>
> How can I get more info from postgres on the autovacuum logic?
>
>
>I would:
>1) manually VACUUM ANALYZE the table,
>2) drop the three autovacuum_*_scale_factor values down to 0.03 (i.e. 3%),
Reporting back, after reducing the values, the table has been picked up
for both autovacuum and analyze. Thank you for the immediate feedback!
Since I had spent some time looking into these values and was "certain"
that they were % while they are apparently *not*, I'm wondering if
max_val=100 is there because of historical reasons, and if it would make
sense to change it to 1.
Dimitris
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