On Sat, May 1, 2010 at 12:13 PM, Scott Marlowe <scott.marlowe@xxxxxxxxx> wrote: > On Fri, Apr 30, 2010 at 4:50 PM, Josh Berkus <josh@xxxxxxxxxxxx> wrote: >> Which is the opposite of my experience; currently we have several >> clients who have issues which required more-frequent analyzes on >> specific tables. Before 8.4, vacuuming more frequently, especially on >> large tables, was very costly; vacuum takes a lot of I/O and CPU. Even >> with 8.4 it's not something you want to increase without thinking about >> the tradeoff > > Actually I would think that statement would be be that before 8.3 > vacuum was much more expensive. The changes to vacuum for 8.4 mostly > had to do with moving FSM to disk, making seldom vacuumed tables > easier to keep track of, and making autovac work better in the > presence of long running transactions. The ability to tune IO load > etc was basically unchanged in 8.4. What about http://www.postgresql.org/docs/8.4/static/storage-vm.html ? ...Robert -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
