Please cc the list so others can reply as well... On Thu, Jan 25, 2007 at 08:45:50AM +0100, Tomas Vondra wrote: > > On Wed, Jan 24, 2007 at 02:37:44PM +0900, Galy Lee wrote: > >> 1. How do we know if autovacuum is enough for my application, or should > >> I setup a vacuum manually from cron for my application? > > > > Generally I trust autovac unless there's some tables where it's critical > > that they be vacuumed frequently, such as a queue table or a web session > > table. > > You can tune thresholds and scale factors for that particular table > using pg_autovacuum. If you lower them appropriately, the vacuum will be > fired more often for that table - but don't lower them too much, just go > step by step until you reach values that are fine for you. That doesn't work well if autovac gets tied up vacuuming a very large table. Granted, when that happens there are considerations about the long-running vacuum transaction (prior to 8.2), but in many systems you'll still get some use out of other vacuums. -- Jim C. Nasby, Database Architect jim@xxxxxxxxx 512.569.9461 (cell) http://jim.nasby.net
