Horton

Re: WIP patch for parallel pg_dump

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
Cc: "Greg Smith" <greg@2ndquadrant.com>, "Andrew Dunstan" <andrew@dunslane.net>, "Heikki Linnakangas" <heikki.linnakangas@enterprisedb.com>, "Robert Haas" <robertmhaas@gmail.com>, "Joachim Wieland" <joe@mcknight.de>, "pgsql-hackers" <pgsql-hackers@postgresql.org>
Date: 2010-12-06T18:49:28Z
Lists: pgsql-hackers 
"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> No.  See subtransactions.
 
> Subtransactions are included in snapshots?

Sure, see GetSnapshotData().  You could avoid it by setting
suboverflowed, but that comes at a nontrivial performance cost.

			regards, tom lane