From: Robert Creager <Robert_Creager@LogicalChaos.org>
To: Matthew T. O'Connor <matthew@zeut.net>
Cc: PGPerformance <pgsql-performance@postgresql.org>
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS
Date: Sun, 17 Jul 2005 22:10:50 -0600
Message-ID: <20050717221050.7c4ac241@thunder.logicalchaos.org> (raw)
In-Reply-To: <42DB2684.9020706@zeut.net>
References: <20050717213416.59dcb52e@thunder.logicalchaos.org>
<42DB2684.9020706@zeut.net>
I am, and it is. It's ANALYZING and VACUUM'ing tables every interval (5 minutes
- 8.0.3). Right now, for that last 4 hours, I'm not VACUUMing the 7.4.1
database and it's still clicking along at < .2 second queries. Last year
(7.4.1), I noticed that it took about a week of heavy activity (for this DB)
before I'd really need a vacuum. That's when I put in the 5 min cron.
When I first switched over to 8.0.3, I was still running the cron vacuum. I got
into big trouble when I had vacuum's backed up for 6 hours. That's when I
started noticing the query problem, and the CS numbers being high. 7.4.1
vacuums every 5 minutes always take < 30 seconds (when I'm watching).
Cheers,
Rob
When grilled further on (Sun, 17 Jul 2005 23:48:20 -0400),
"Matthew T. O'Connor" <matthew@zeut.net> confessed:
> Robert Creager wrote:
>
> >For 8.03, pg_autovacuum is running. On 7.4.1, I set up a cron job to vacuum
> >analyze every 5 minutes.
> >
> >
>
> Are you sure that pg_autovacuum is doing it's job? Meaning are you sure
> it's vacuuming as often as needed? Try to run it with -d2 or so and
> make sure that it is actually doing the vacuuming needed.
--
22:04:10 up 4 days, 1:39, 8 users, load average: 0.15, 0.15, 0.12
Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004
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To: pgsql-performance@postgresql.org
Cc: Robert_Creager@LogicalChaos.org, matthew@zeut.net
Subject: Re: Huge performance problem between 7.4.1 and 8.0.3 - CS
In-Reply-To: <20050717221050.7c4ac241@thunder.logicalchaos.org>
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