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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@2ndquadrant.com>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: PostgreSQL Bugs <pgsql-bugs@postgresql.org>
Subject: Re: pg_upgrade < 9.3 -> >=9.3 misses a step around multixacts
Date: Mon, 21 Jul 2014 13:17:25 -0400
Message-ID: <6720.1405963045@sss.pgh.pa.us> (raw)
In-Reply-To: <20140721170953.GP5974@alap3.anarazel.de>
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Andres Freund <andres@2ndquadrant.com> writes:
> On 2014-07-21 13:03:21 -0400, Tom Lane wrote:
>> I don't see any point in being picky about it.  What we want is to reject
>> values that are conclusively bogus; things that are just close to bogus
>> are not so interesting.

> It'd just have been about optimizing away repeated calls to ReadNew*...

Oh.  I think the existing code is probably efficient enough about that.
vac_update_datfrozenxid() only does it once anyway, and the calls in
vac_update_relstats() are arranged so that we don't expect them to be hit
at all in normal cases.

			regards, tom lane


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