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

From Tom Lane
Subject Re: relation cache statistics (was: -HEAD planner issue wrt hash_joins on dbt3 ?)
Date
Msg-id 15285.1158553210@sss.pgh.pa.us
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In response to relation cache statistics (was: -HEAD planner issue wrt hash_joins on dbt3 ?)  ("Jim C. Nasby" <jimn@enterprisedb.com>)
Responses Re: relation cache statistics (was: -HEAD planner issue wrt hash_joins on dbt3 ?)  ("Jim C. Nasby" <jimn@enterprisedb.com>)
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"Jim C. Nasby" <jimn@enterprisedb.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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