Re: relation cache statistics (was: -HEAD planner issue wrt hash_joins on dbt3 ?)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Jim C(dot) Nasby" <jimn(at)enterprisedb(dot)com>
Cc: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: relation cache statistics (was: -HEAD planner issue wrt hash_joins on dbt3 ?)
Date: 2006-09-18 04:20:10
Message-ID: 15285.1158553210@sss.pgh.pa.us
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"Jim C. Nasby" <jimn(at)enterprisedb(dot)com> writes:
> I think it'd be better to attack this problem from the "other side";
> namely looking at what's actually cached.

You can kiss goodbye to plan stability if you go that route... and
in any case I doubt the assumption that what's in shared buffers is
representative of what's in kernel cache.

regards, tom lane

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