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help / color / mirror / Atom feedFrom: sud <[email protected]>
To: Muhammad Salahuddin Manzoor <[email protected]>
Cc: pgsql-general <[email protected]>
Subject: Re: Long running query causing XID limit breach
Date: Thu, 23 May 2024 10:18:39 +0530
Message-ID: <CAD=mzVXm2wQD707KrwsQUH=8xE3Zknr8hWuTV_qz2XcTzFzYXg@mail.gmail.com> (raw)
In-Reply-To: <CAKD7CDk=mB3Z2m9hLK=bX1=KThUwOE+yudmOEaBb6Grqg8HXaQ@mail.gmail.com>
References: <CAD=mzVXR3GjM0vcthMBwEdbOKqSKcv8oojSS9coczWRi9BRYTA@mail.gmail.com>
<CAKD7CDk=mB3Z2m9hLK=bX1=KThUwOE+yudmOEaBb6Grqg8HXaQ@mail.gmail.com>
On Thu, May 23, 2024 at 9:00 AM Muhammad Salahuddin Manzoor <
[email protected]> wrote:
> Greetings,
>
> In high-transaction environments like yours, it may be necessary to
> supplement this with manual vacuuming.
>
> Few Recommendations
>
> Monitor Long-Running Queries try to optimize.
> Optimize Autovacuum.
> Partitioning.
> Adopt Vacuum Strategy after peak hours.
>
> We have these big tables already partitioned. So does "vacuum table_name"
will endup scanning whole table or just the latest/live partition which is
getting loaded currently? and do you mean to say running command "vacuum
table_name;" frequently on selective tables that are experiencing heavy DML
? Hope this won't lock the table anyway because the data will be
written/read from these tables 24/7.
When you say, "optimize autovacuum" does it mean to set a higher value
of "autovacuum_max_workers"
and "autovacuum_freeze_max_age"?
Considering we have ~4 billion rows inserted daily into the table and there
is limit of ~2billion to the "Maximumusedtxnids", what threshold should we
set for the alerting and to have enough time at hand to fix this issue?
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Subject: Re: Long running query causing XID limit breach
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