On Wed, Aug 09, 2006 at 03:46:38PM +0200, Martijn van Oosterhout wrote: > On Wed, Aug 09, 2006 at 09:19:31AM -0400, Tom Laudeman wrote: > > Is there a tuning parameter I can change to increase speed of selects? > > Clearly, there's already some buffering going on since selecting an > > indexed ~50,000 records takes 17 seconds on the first try, and only 0.5 > > seconds on the second try (from pgsql). > > Your OS is probably buffering, 1GB of RAM holds a lot of data. You can > try increasing the shared_buffers parameter, but if the delay is > getting data from the disk, that won't really help you. If most of your queries use the same index then clustering on that index might speed up initial (i.e., not-cached) queries by reducing the number of disk pages that need to be read. See the documentation for more information. http://www.postgresql.org/docs/8.1/interactive/sql-cluster.html -- Michael Fuhr
