From: Dennis Bjorklund <db@zigo.dhs.org>
To: Carlos Moreno <moreno_pg@mochima.com>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Upgraded to 8.2.3 --- still having performance issues
Date: Sat, 03 Mar 2007 07:41:51 +0100
Message-ID: <45E918AF.7040309@zigo.dhs.org> (raw)
In-Reply-To: <45E5B7D2.5020306@mochima.com>
References: <45E5B7D2.5020306@mochima.com>
Carlos Moreno skrev:
> The system does very frequent insertions and updates --- the longest
> table has, perhaps, some 20 million rows, and it's indexed (the primary
> key is the combination of two integer fields). This longest table only
> has inserts (and much less frequent selects), at a peak rate of maybe
> one or a few insertions per second.
One or a few inserts per second doesn't sound like that much. I would
have expected it to work. If you can you might want to group several
inserts into a single transaction.
A standard hint is also to move the WAL onto its own disk. Or get a disk
controller with battery backed up ram.
But it's hard to say from your description what the bottleneck is and
thus hard to give any advice.
> Any help/tips/guidance in troubleshooting this issue? It will be
> much appreciated!
You could try to find specific queries that are slow. Pg can for example
log queries for you that run for longer than X seconds.
/Dennis
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To: pgsql-performance@postgresql.org
Cc: db@zigo.dhs.org, moreno_pg@mochima.com
Subject: Re: Upgraded to 8.2.3 --- still having performance issues
In-Reply-To: <45E918AF.7040309@zigo.dhs.org>
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