Re: [PERFORM] More Vacuum questions...

2007-09-11 Thread Decibel!
On Tue, Sep 11, 2007 at 10:24:58AM -0600, Kevin Kempter wrote: > I let the cron vacuum run for 14 days. in that 14 days the time it takes to > vacuum the table grew from 1.2hours directly after the rebuild to > 8hours > last nite. Sounds to me like daily isn't enough, and that your FSM is too sm

Re: [PERFORM] More Vacuum questions...

2007-09-11 Thread Heikki Linnakangas
Kevin Kempter wrote: > It's difficult to try and vacuum this table during the day as it seems to > begin blocking all the other queries against the database after some time. Vacuum can generate so much I/O that it overwhelms all other transactions, but it shouldn't block other queries otherwise

[PERFORM] More Vacuum questions...

2007-09-11 Thread Kevin Kempter
Hi List; I've recently started cleaning up some postgres db's which previous to my recent arrival had no DBA to care for them. I quickly figured out that there were several tables which were grossly full of dead space. One table in particular had 75G worth of dead pages (or the equivelant in o