From: | Robert Creager <Robert_Creager(at)LogicalChaos(dot)org> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | PGPerformance <pgsql-performance(at)postgresql(dot)org>, Andy Hewitt <Andy_Hewitt(at)StorageTek(dot)com> |
Subject: | Re: Huge performance problem between 7.4.1 and 8.0.3 - CS |
Date: | 2005-07-18 05:09:12 |
Message-ID: | 20050717230912.12d51ec9@thunder.logicalchaos.org |
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Lists: | pgsql-performance |
When grilled further on (Mon, 18 Jul 2005 00:10:53 -0400),
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> confessed:
> Have you tried reverting
> to the cron-based vacuuming method you used in 7.4?
>
I just stopped autovacuum, ran a manual vacuum analyze on 803 (2064 pages
needed, 8000000 FSM setting) and re-started the run (with cron vac enabled).
The query problem has not showed up yet (1/2 hour). A vacuum on 741 showed 3434
pages needed, 200000 FSM setting.
I'll let it run the night and see if it shows up after a couple of hours. It
has run clean for 1 hour prior. If this runs 'till morning, I'll re-enable the
autovacuum, disable the cron and see if it reproduces itself (the slowdown).
Cheers,
Rob
--
22:18:40 up 4 days, 1:53, 8 users, load average: 0.10, 0.20, 0.14
Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004
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