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From: Jim C. Nasby <jnasby@pervasive.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Markus Schaber <schabi@logix-tt.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: merge>hash>loop
Date: Tue, 18 Apr 2006 18:15:52 -0500
Message-ID: <20060418231552.GN49405@pervasive.com> (raw)
In-Reply-To: <19388.1145398946@sss.pgh.pa.us>
References: <1145029009.3422.31.camel@spectre.intellivid.com>
	<10000.1145031205@sss.pgh.pa.us>
	<1145033149.3422.41.camel@spectre.intellivid.com>
	<11035.1145033929@sss.pgh.pa.us>
	<4444C4CF.2000106@logix-tt.com>
	<20060418215238.GK49405@pervasive.com>
	<19388.1145398946@sss.pgh.pa.us>

On Tue, Apr 18, 2006 at 06:22:26PM -0400, Tom Lane wrote:
> "Jim C. Nasby" <jnasby@pervasive.com> writes:
> > Actually, if you run with stats_block_level turned on you have a
> > first-order approximation of what is and isn't cached.
> 
> Only if those stats decayed (pretty fast) with time; which they don't.

Good point. :/ I'm guessing there's no easy way to see how many blocks
for a given relation are in shared memory, either...
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461



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