Ühel kenal päeval, E, 2006-08-14 kell 18:21, kirjutas Peter Eisentraut: > Perez wrote: > > I thought, from watching the list for a while, that the planner > > statistics needed were known but that how to gather the statistics > > was not? > > I think over the course of the discussion we have figured out that we > would like to have cross-column correlation statistics. The precise > mathematical incarnation hasn't been determined yet, as far as I can > see. Collecting the statistics thereafter isn't that hard, but there > needs to be a way to not collect an exponential volume of statistics on > all column combinations.
I understood that the proposal was to collect only the stats where needed (determined by user/dba) and use some rule-of-thumb values if no collected stats were available. -- ---------------- Hannu Krosing Database Architect Skype Technologies OÜ Akadeemia tee 21 F, Tallinn, 12618, Estonia Skype me: callto:hkrosing Get Skype for free: http://www.skype.com ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
