On Tue, 2007-11-06 at 09:29 -0500, Bill Moran wrote: > In response to SHARMILA JOTHIRAJAH <sharmi_jo@xxxxxxxxx>: > > > Hi > > We are in the process of testing for migration of our database from Oracle to Postgresql. > > I hava a simple query > > > > Select count(*) from foo > > This is asked a lot. The quick answer is that PostgreSQL method of MVCC > makes it impossible to make this query fast. Perhaps, someday, some > brilliant developer will come up with an optimization, but that hasn't > happened yet. What release level is being tested? It may already have happened. 8.3 is substantially faster at seq scans, so the tests should be re-run on 8.3 beta. Also, re-run the Postgres test. It should be faster the second time, even if the database server is restarted between tests. -- Simon Riggs 2ndQuadrant http://www.2ndQuadrant.com ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
