Paul Tillotson <[EMAIL PROTECTED]> writes: > Does postgres actually do multiple concurrent sorts within a single > backend?
Certainly. Consider for example a merge join with each input being sorted by an explicit sort step. DISTINCT, ORDER BY, UNION, and related operators require their own sort steps in the current implementation. It's not difficult to invent queries that require arbitrarily large numbers of sort steps. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])