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Re: planner/optimizer question

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Manfred Koizar <mkoi-pg(at)aon(dot)at>
Cc: Jochem van Dieten <jochemd(at)oli(dot)tudelft(dot)nl>,pgsql-performance(at)postgresql(dot)org
Subject: Re: planner/optimizer question
Date: 2004-05-01 01:19:39
Message-ID: 8881.1083374379@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-performance
Manfred Koizar <mkoi-pg(at)aon(dot)at> writes:
> Yes, the visible-to-all flag would be set as a by-product of an index
> scan, if the heap tuple is found to be visible to all active
> transactions.  This update is non-critical

Oh really?  I think you need to think harder about the transition
conditions.

Dead-to-all is reasonably safe to treat as a hint bit because *it does
not ever need to be undone*.  Visible-to-all does not have that
property.

			regards, tom lane

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