Re: MultiXactMemberFreezeThreshold can make autovacuum *less* aggressive

From: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: MultiXactMemberFreezeThreshold can make autovacuum *less* aggressive
Date: 2024-06-13 16:04:19
Message-ID: fdcc3def-c1cb-466f-88d3-d368c6e8be71@iki.fi
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On 13/06/2024 17:40, Robert Haas wrote:
> On Thu, Jun 13, 2024 at 8:29 AM Heikki Linnakangas <hlinnaka(at)iki(dot)fi> wrote:
>> However, the value that the function calculates can sometimes be
>> *greater* than autovacuum_multixact_freeze_max_age.
>
> That was definitely not what I intended and is definitely bad.
>
>> In any case, I think the function
>> should clamp the result to autovacuum_multixact_freeze_max_age, per
>> attached.
>
> LGTM.

Committed and backpatched to all supported versions. Thanks!

--
Heikki Linnakangas
Neon (https://neon.tech)

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