Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold <

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От Kevin Grittner
Тема Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold <
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Msg-id CACjxUsNfxxZG2ZsxBbcVqX+3j=KXE11n2p_tm5OaQ0q_KO1z4w@mail.gmail.com
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Ответ на Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold <  (Andres Freund <andres@anarazel.de>)
Ответы Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold <  (Alvaro Herrera <alvherre@2ndquadrant.com>)
Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold <  (Tom Lane <tgl@sss.pgh.pa.us>)
Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold <  (Andres Freund <andres@anarazel.de>)
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On Tue, May 24, 2016 at 12:00 PM, Andres Freund <andres@anarazel.de> wrote:

> Analyze IIRC acquires a new snapshot when getting sample rows,

I could not find anything like that, and a case-insensitive search
of analyze.c finds no occurrences of "snap".  Can you remember
where you think you saw something that would cause the ANALYZE
command in my test to use a snapshot other than the one from the
REPEATABLE READ transaction in which it was run?

--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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