On Wed, Apr 13, 2011 at 4:32 PM, Kevin Grittner
<Kevin.Grittner@wicourts.gov> wrote:
> If you model the costing to reflect the reality on your server, good
> plans will be chosen.
Wouldn't it be "better" to derive those costs from actual performance
data measured at runtime?
Say, pg could measure random/seq page cost, *per tablespace* even.
Has that been tried?