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From: Antonin Houska <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: Mihail Nikalayeu <[email protected]>
Cc: Srinath Reddy Sadipiralla <[email protected]>
Cc: Matthias van de Meent <[email protected]>
Cc: Pg Hackers <[email protected]>
Cc: Robert Treat <[email protected]>
Subject: Re: Adding REPACK [concurrently]
Date: Wed, 01 Apr 2026 15:20:44 +0200
Message-ID: <198173.1775049644@localhost> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Alvaro Herrera <[email protected]> wrote:

> So, if we're unable to get this particular patch in, we would have to
> have a big fat warning in the docs, telling people to be careful about
> other load if they choose to run concurrent repack -- it could have
> serious consequences.  But on the other hand, it's better to *have* the
> tool, even if it has problems, than not have it.  Keep in mind that
> pg_repack and pg_squeeze also have all these problems/limitations (and
> others), and still people use them.

1. To be precise, pg_squeeze has this limitation. pg_repack does not use
logical replication.

2. I expect the limitation of PG core to be relaxed in versions > 19, as long
as we integrate the MVCC safety feature. REPACK will then run w/o XID most of
the time (XID will only be needed for catalog changes), so other decoding
backends won't need to wait for its completion.

-- 
Antonin Houska
Web: https://www.cybertec-postgresql.com

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