On Tue, Mar 28, 2006 at 11:20:19AM -0600, Dave Dutcher wrote: > I guess what I am really curious about is why was the OP getting an > expensive sort when the planner tried a merge join?
A merge join requires sorted inputs. > Most of the time was spent sorting the parameters parameters table by > opset_num even though opset_num is indexed. Isn't Postgres able to walk the > index instead of sorting? The time of an index scan vs. a sequential scan + sort depends on several factors, so it's not just a matter of walking the index whenever there is one. /* Steinar */ -- Homepage: http://www.sesse.net/ ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org
