From: Tom Lane <tgl@sss.pgh.pa.us>
To: Robert Creager <Robert_Creager@StorageTek.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS issue?
Date: Tue, 19 Jul 2005 12:54:22 -0400
Message-ID: <7322.1121792062@sss.pgh.pa.us> (raw)
In-Reply-To: <20050719105014.00007635@C118181.stortek.com>
References: <20050718114952.00004ac5@C118181.stortek.com>
<15472.1121709173@sss.pgh.pa.us>
<20050719105014.00007635@C118181.stortek.com>
Robert Creager <Robert_Creager@StorageTek.com> writes:
> Alright. Restarted the 803 database. Cron based vacuum analyze is
> running every 5 minutes. vacuum_cost_delay is 0. The problem showed
> up after about 1/2 hour of running. I've got vacuum jobs stacked from
> the last 35 minutes, with 2 vacuums running at the same time. CS is
> around 73k.
Hmm, I hadn't thought about the possible impact of multiple concurrent
vacuums. Is the problem caused by that, or has performance already gone
into the tank by the time the cron-driven vacuums are taking long enough
to overlap?
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, Robert_Creager@StorageTek.com
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS issue?
In-Reply-To: <7322.1121792062@sss.pgh.pa.us>
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