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help / color / mirror / Atom feedFrom: Antonin Houska <[email protected]>
To: Alvaro Herrera <[email protected]>
Cc: Michael Banck <[email protected]>
Cc: Junwang Zhao <[email protected]>
Cc: Kirill Reshke <[email protected]>
Cc: Pavel Stehule <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: why there is not VACUUM FULL CONCURRENTLY?
Date: Fri, 31 Jan 2025 11:15:24 +0100
Message-ID: <24725.1738318524@antos> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
Alvaro Herrera <[email protected]> wrote:
> On 2025-Jan-31, Antonin Houska wrote:
>
> Something that Robert Haas just mentioned to me is handling of row
> locks: if concurrent transactions are keeping rows in the original table
> locked (especially SELECT FOR KEY SHARE, since that's not considered by
> logical decoding at present and it would be possible to break foreign
> keys if we just do nothing), them we need these to be "transferred" to
> the new table somehow.
The current implementation acquires AccessExclusiveLock on the table
(supposedly for very short time) so it can swap the table and index
files. Once we have that lock, I think the transactions holding the row locks
should no longer be running. Or can the row lock "survive" the table lock
somehow?
--
Antonin Houska
Web: https://www.cybertec-postgresql.com
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Subject: Re: why there is not VACUUM FULL CONCURRENTLY?
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