Steve <cheetah@xxxxxxxxxx> writes: > Either way, it runs perfectly fast. So it looks like the indexes are > confusing this query like you suspected. Any advise? Wow --- sometimes grasping at straws pays off. I was testing here with just a subset of the indexes to save build time, but I bet that one of the "irrelevant" ones is affecting this somehow. Time to re-test. If you have some time to kill, it might be interesting to vary that begin/rollback test script to leave one or two other indexes in place, and see if you can identify exactly which other index(es) get it confused. I'm about to go out to dinner with the wife, but will have a closer look when I get back, or tomorrow morning. We'll figure this out. regards, tom lane