On Tue, Mar 28, 2006 at 10:18:25AM -0600, Dave Dutcher wrote: >> "parameters_idx" btree (run, opset_num, step_num, opset, > opset_ver, >> step, step_ver, name, split, wafers) >> "parameters_opset_idx" btree (opset, step, name) >> "parameters_step_idx" btree (step, name) > Have you tried creating some different indexes on parameters? I don't > know if it should matter or not, but I would try some indexes like: > > (run, opset_num) //Without all the other columns > (opset_num, run) //Backwards > (opset_num) An index on (A,B,C) can be used for a query on (A,B) or (A), so it doesn't really matter. It isn't usable for a query on (B), (C) or (B,C), though. (The index rows will get bigger, of course, so you'll need more I/O if you want to scan large parts of it, but I guess that's beside the point.) /* Steinar */ -- Homepage: http://www.sesse.net/
