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Re: crash-safe visibility map, take three

From: Jim Nasby <jim(at)nasby(dot)net>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Jeff Davis <pgsql(at)j-davis(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: crash-safe visibility map, take three
Date: 2010-12-01 23:41:33
Message-ID: CCE55EDE-8354-4E2B-A815-E5A29018D33F@nasby.net (view raw or flat)
Thread:
Lists: pgsql-hackers
On Dec 1, 2010, at 2:59 PM, Robert Haas wrote:
> 2. Hint bits are necessary because an old XID can't be viewed as
> guaranteed committed.

Hmm... I thought hint bits were necessary because it's too expensive to query CLOG for every tuple. If my understanding is correct then if we fix the CLOG performance issue we don't need hint bits anymore.
--
Jim C. Nasby, Database Architect                   jim(at)nasby(dot)net
512.569.9461 (cell)                         http://jim.nasby.net



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