Re: An idle thought

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jeff Davis <pgsql(at)j-davis(dot)com>
Cc: Gokulakannan Somasundaram <gokul007(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: An idle thought
Date: 2010-03-18 23:00:43
Message-ID: 19240.1268953243@sss.pgh.pa.us
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Jeff Davis <pgsql(at)j-davis(dot)com> writes:
> I tested in gdb, and it calls HeapTupleSatisfiesMVCC, until I VACUUM a
> few times, and then it doesn't call it any more. So, apparently the seq
> scan optimization _is_ there. And that means it is correctness-critical.

The page header bit is critical. Not the VM.

regards, tom lane

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