On Sat, May 1, 2010 at 12:13 PM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
> On Fri, Apr 30, 2010 at 4:50 PM, Josh Berkus <josh@agliodbs.com> 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