Thanks, after playing around a little I found that placing the indices on a different drive gave a real performance increase in my scenario. Johann -----Original Message----- From: Tom Lane [mailto:tgl@xxxxxxxxxxxxx] Sent: Monday, October 10, 2005 4:35 PM To: Weber, Johann (ISS Kassel) Cc: pgsql-admin@xxxxxxxxxxxxxx Subject: Re: Data and logs on different physical drives - advantage? "Weber, Johann (ISS Kassel)" <jweber@xxxxxxx> writes: > Is this true for PostgreSQL (V 8.0 on ReadHat)? My tests do not show > any speed gained when placing pg_clog and pg_xlog on a different drive. The conventional wisdom is that it's a win to have pg_xlog on a drive by itself. The above is not that. pg_clog is more in the nature of data, and in any case you lose the advantage as soon as the drive handling pg_xlog has to move the head away from the current xlog file. Whether any particular test case would show an advantage is another question of course. In a heavy-write scenario I would think you could probably measure a win. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to majordomo@xxxxxxxxxxxxxx so that your message can get through to the mailing list cleanly
