From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Jean-David Beyer <jeandavid8@verizon.net>
Cc: pgsql performance <pgsql-performance@postgresql.org>
Subject: Re: Curious about dead rows.
Date: Wed, 14 Nov 2007 09:58:08 -0300
Message-ID: <20071114125808.GO19014@alvh.no-ip.org> (raw)
In-Reply-To: <473AE63D.7090305@verizon.net>
References: <4735DBDB.5050208@verizon.net>
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<4735FA9F.1080805@verizon.net>
<b42b73150711131628q1469df3el6f557e10de07a05@mail.gmail.com>
<473A5CC0.3060003@verizon.net>
<b42b73150711131936l65b97b9ya7953383673b2710@mail.gmail.com>
<473AE63D.7090305@verizon.net>
Jean-David Beyer wrote:
> How do I reset the counters in pg_stat_database and pg_stat_all_tables?
> I tried just restarting postgres, but it seems to be saved in the database,
> not just in the RAM of the server.
There is a function called pg_stat_reset() or some such.
> I suppose that blks_read and blks_hit are zero because there are 8 GBytes
> RAM on this machine and I give 2GBytes to shared_buffers = 253000 so that
> all sits in RAM.
Perhaps you have stats_block_level set to off?
> I know there have been rollbacks but I do a REINDEX, CLUSTER, and VACUUM
> ANALYZE before starting the inserts in question.
You do all three on the same tables? That seems pretty pointless. A
sole CLUSTER has the same effect.
> Do I need to do a VACUUM FULL ANALYZE instead?
No.
--
Alvaro Herrera Valdivia, Chile ICBM: S 39º 49' 18.1", W 73º 13' 56.4"
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To: pgsql-performance@postgresql.org
Cc: alvherre@alvh.no-ip.org, jeandavid8@verizon.net
Subject: Re: Curious about dead rows.
In-Reply-To: <20071114125808.GO19014@alvh.no-ip.org>
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