Thanks Tom! You're a life-saver. On Fri, 2004-01-23 at 17:08, Tom Lane wrote: > Orion Henry <[EMAIL PROTECTED]> writes: > > The queries usually are in the form of, where "user_id = something and > > event_time between something and something". > > > Half of my queries index off of the user_id and half index off the > > event_time. I was thinking this would be a perfect opportunity to use a > > dual index of (user_id,event_time) but I'm confused as to weather this > > will help > > Probably. Put the user_id as the first column of the index --- if you > think about the sort ordering of a multicolumn index, you will see why. > With user_id first, a constraint as above describes a contiguous > subrange of the index; with event_time first it does not. > > regards, tom lane -- Orion Henry <[EMAIL PROTECTED]>
signature.asc
Description: This is a digitally signed message part
