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From: Peter Geoghegan <[email protected]>
To: Pavel Luzanov <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Cc: Melanie Plageman <[email protected]>
Cc: Heikki Linnakangas <[email protected]>
Subject: Re: PG17 optimizations to vacuum
Date: Sun, 1 Sep 2024 18:00:25 -0400
Message-ID: <CAH2-Wz=pCtsB3v42RB5dLnzEn3tQLUJ8fJMn+si-9A8s6v=B1A@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Sun, Sep 1, 2024 at 5:44 PM Pavel Luzanov <[email protected]> wrote:
> I see a perfectly working TID-store optimization.
> With reduced maintenance_work_mem it used only one 'vacuuming indexes'
> phase instead of 21 in v16.
> But I also expected to see a reduction in the number of WAL records
> and the total size of the WAL. Instead, WAL numbers have significantly
> degraded.
>
> What am I doing wrong?

That does seem weird.

CC'ing the authors of the relevant VACUUM enhancements.

-- 
Peter Geoghegan

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