From: "Ian Westmacott" <ianw@intellivid.com>
To: "Daniel J. Luke" <dluke@geeklair.net>
Cc: <pgsql-performance@postgresql.org>
Subject: Re: Getting even more insert performance (250m+rows/day)
Date: Wed, 24 May 2006 23:20:24 -0400
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We were able to achieve 2B (small) rows per day sustained with
very little latency.  It is beefy hardware, but things that did
help include WAL on its own I/O channel, XFS, binary copy,
and tuning bgwriter and checkpoint settings for the application
and hardware.  Things that didn't help much were shared_buffers
and wal_buffers.  But our application is single-writer, and a
small number of readers.

Although there is tons of great advice in this and other forums,
I think you just have to do a lot of experimentation with careful
measurement to find what's right for your application/environment.
i.e., YMMV.

-----Original Message-----
From: pgsql-performance-owner@postgresql.org
[mailto:pgsql-performance-owner@postgresql.org]On Behalf Of Steinar H.
Gunderson
Sent: Wednesday, May 24, 2006 4:04 PM
To: Daniel J. Luke
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Getting even more insert performance
(250m+rows/day)


On Wed, May 24, 2006 at 03:45:17PM -0400, Daniel J. Luke wrote:
> Things I've already done that have made a big difference:
> - modified postgresql.conf shared_buffers value
> - converted to COPY from individual insert statements
> - changed BLCKSZ to 32768

Have you tried fiddling with the checkpointing settings? Check your logs --
if you get a warning about checkpoints being too close together, that should
give you quite some boost.

Apart from that, you should have quite a bit to go on -- somebody on this
list reported 2 billion rows/day earlier, but it might have been on beefier
hardware, of course. :-)

/* Steinar */
--
Homepage: http://www.sesse.net/

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