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Re: Pgstat.tmp file activity

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Dan Austin" <DAustin(at)au(dot)westfield(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Pgstat.tmp file activity
Date: 2005-12-23 06:00:39
Message-ID: 16595.1135317639@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-admin
"Dan Austin" <DAustin(at)au(dot)westfield(dot)com> writes:
> One of Sun's kernel engineers has come up with a solution that seems to
> have fixed the problem. Instead of increasing work_mem (which we still
> might do) we've mounted a swapfs partition over the pg temp directory:
>   # mount | grep pgsql_tmp
>   /export/data/pgsql/data/base/64920741/pgsql_tmp on swap [...]
> This has actually reduced the disk activity considerably. So far, the
> blocking problem seems to have gone.

OK, so the stats collector is off the hook: it's not writing anything
in that directory.  I'd say you have a pretty conventional
query-optimization problem here after all --- you want to cut the
traffic into those temp files.  You ought to be looking at EXPLAIN
ANALYZE info for your common queries.

			regards, tom lane

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