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help / color / mirror / Atom feedFrom: PetSerAl <[email protected]>
To: [email protected]
Subject: pg_dump and not MVCC-safe commands
Date: Sun, 19 May 2024 05:24:28 +0300
Message-ID: <CAKygsHQHhd4rzYcNCd8OJMH46saT1E+9+5MT2CgOCGgf_yaQAw@mail.gmail.com> (raw)
How pg_dump interact with not MVCC-safe commands?
As I understand, pg_dump first take snapshot and then lock all tables
it intended to dump. What happens if not MVCC-safe command committed
after snapshot but before lock? From comment to pg_dump.c I understand
that it may fail with 'cache lookup failed' error. But, can it happen,
that pg_dump not fail, but instead capture inconsistent dump? For
example TRUNCATE committed after snapshot and pg_dump will see result
of TRUNCATE but not result of other commands in TRUNCATE transaction?
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Subject: Re: pg_dump and not MVCC-safe commands
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