Re: WIP patch for parallel pg_dump

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: "Greg Smith" <greg(at)2ndquadrant(dot)com>, "Andrew Dunstan" <andrew(at)dunslane(dot)net>, "Heikki Linnakangas" <heikki(dot)linnakangas(at)enterprisedb(dot)com>, "Robert Haas" <robertmhaas(at)gmail(dot)com>, "Joachim Wieland" <joe(at)mcknight(dot)de>, "pgsql-hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP patch for parallel pg_dump
Date: 2010-12-06 18:49:28
Message-ID: 29609.1291661368@sss.pgh.pa.us
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"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)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

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