On Thu, 1 Jul 2004, Mike Rylander wrote: > On Thursday 01 July 2004 06:43 pm, Gavin Sherry wrote: > > Hi Mike, > > > > In this release, unfortunately not. > > That't too bad, but it's not that urgent I suppose. > > > > > I had some idea early on of putting rand_page_cost in pg_tablespace and > > having the planner have access to it for costing. I didn't actually get > > around to it but. :-( > > Well, I haven't looked at the PG source before, but if you have some specific > design ideas I would be glad to help out. I'm just not sure where (or when, > with the official release coming (sort of) soon) to start, but with some > pointers I'll do what I can!
Well, it wont be in 7.5. Feel free to start looking at how random_page_cost in cost_index(). It might be worthwhile introducing a per tablespace performance factor so that we could could say that the cost of fetching an index tuple from tablespace A is half that of fetching an index tuple from tablespace B. That idea might not actually turn out to be a very good one once I look at it closely though. Gavin ---------------------------(end of broadcast)--------------------------- TIP 7: don't forget to increase your free space map settings
