Re: How much do the hint bits help?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Merlin Moncure <mmoncure(at)gmail(dot)com>
Cc: Aidan Van Dyk <aidan(at)highrise(dot)ca>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: How much do the hint bits help?
Date: 2010-12-22 16:06:15
Message-ID: 6073.1293033975@sss.pgh.pa.us
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Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
> well, simon's point that hint bits complicate checksum may nor may not
> be the case, but no hint bits = less i/o = less checksumming (unless
> you checksum around the hint bits).

I think you're optimistically assuming the extra clog accesses don't
cost any I/O.

regards, tom lane

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