From: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: Steve Eckmann <eckmann@computer.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: improving write performance for logging application
Date: Wed, 4 Jan 2006 01:06:03 +0100
Message-ID: <20060104000603.GA29469@uio.no> (raw)
In-Reply-To: <43BB0C5C.8020207@computer.org>
References: <43BB0C5C.8020207@computer.org>
On Tue, Jan 03, 2006 at 04:44:28PM -0700, Steve Eckmann wrote:
> Are there general guidelines for tuning the PostgreSQL server for this kind
> of application? The suggestions I've found include disabling fsync (done),
Are you sure you really want this? The results could be catastrophic in case
of a crash.
> On the client side I've found only two suggestions: disable autocommit and
> use COPY instead of INSERT. I think I've effectively disabled autocommit by
> batching up to several hundred INSERT commands in each PQexec() call, and
> it isn’t clear that COPY is worth the effort in our application.
I'm a bit confused here: How can you batch multiple INSERTs into large
statements for MySQL, but not batch multiple INSERTs into COPY statements for
PostgreSQL?
Anyhow, putting it all inside one transaction (or a few) is likely to help
quite a lot, but of course less when you have fsync=false. Bunding multiple
statements in each PQexec() call won't really give you that; you'll have to
tell the database so explicitly.
/* Steinar */
--
Homepage: http://www.sesse.net/
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To: pgsql-performance@postgresql.org
Cc: sgunderson@bigfoot.com, eckmann@computer.org
Subject: Re: improving write performance for logging application
In-Reply-To: <20060104000603.GA29469@uio.no>
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