Re: Idea for getting rid of VACUUM FREEZE on cold pages

From: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: Jan Wieck <JanWieck(at)Yahoo(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, postgres hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Idea for getting rid of VACUUM FREEZE on cold pages
Date: 2010-05-26 05:04:16
Message-ID: 4BFCABD0.3030905@enterprisedb.com
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On 25/05/10 23:56, Josh Berkus wrote:
> Do we get a bit in the visibility map for a page which has aborted
> transaction rows on it?

If there's a tuple with an aborted xmin on a page, the bit in the
visibility map is not set. A tuple with aborted xmax doesn't matter.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com

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