On Dec 20, 2007 12:50 AM, ivan.hou <ivan.hou@xxxxxxxxxxxxx> wrote: > > i try to compare two methods of garbage-collect.(Postgresql Ver:8.1.3) > > 1. enable autovacuum without using vacuumdb -f mydb in crontab. > 2. using crontab to vacuumdb in every 10 min (autovacuum disable) > > the method 2 got more free space than method 1. > > the disk size of database still increased in method 1. > so, what's the advantage of autovacuum? That really depends. Did the db size increase at first under method 1, then reach a steady state, or did it just keep bloating. It might well be that vacuuming every 10 minutes cost you more in terms of performance than would using autovacuum, and the trade off was slightly more disk space used. Or it could be the db was bloating. If the db was bloating, as Alvaro mentioned, you likely don't have aggressive enough settings for autovacuum. Also, update your pg install to the latest 8.1.x version, 8.1.3 has quite a few nasty bugs in it. ---------------------------(end of broadcast)--------------------------- TIP 5: don't forget to increase your free space map settings
