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help / color / mirror / Atom feedFrom: Antonin Houska <[email protected]>
To: Matthias van de Meent <[email protected]>
Cc: Mihail Nikalayeu <[email protected]>
Cc: Sergey Sargsyan <[email protected]>
Cc: [email protected]
Cc: Andres Freund <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: Andrey Borodin <[email protected]>
Cc: Melanie Plageman <[email protected]>
Subject: Re: Revisiting {CREATE INDEX, REINDEX} CONCURRENTLY improvements
Date: Mon, 01 Dec 2025 10:09:29 +0100
Message-ID: <5784.1764580169@localhost> (raw)
In-Reply-To: <CAEze2WiiR2PeXg_vaURjjiiwvjQ=Um8wxWi1BcVS0BGyxiD2gQ@mail.gmail.com>
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Matthias van de Meent <[email protected]> wrote:
> I'm a bit worried, though, that LR may lose updates due to commit
> order differences between WAL and PGPROC. I don't know how that's
> handled in logical decoding, and can't find much literature about it
> in the repo either.
Can you please give me an example of this problem? I understand that two
transactions do this
T1: RecordTransactionCommit()
T2: RecordTransactionCommit()
T2: ProcArrayEndTransaction()
T1: ProcArrayEndTransaction()
but I'm failing to imagine this if both transactions are trying to update the
same row. For example, if T1 is updating a row that T2 wants to update as
well, then T2 has to wait for T1's call of ProcArrayEndTransaction() before it
can perform its update, and therefore it (T2) cannot start its commit sequence
before T1 has completed it:
T1: RecordTransactionCommit()
T1: ProcArrayEndTransaction()
T2: RecordTransactionCommit()
T2: ProcArrayEndTransaction()
--
Antonin Houska
Web: https://www.cybertec-postgresql.com
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To: [email protected]
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Subject: Re: Revisiting {CREATE INDEX, REINDEX} CONCURRENTLY improvements
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