Kelly Burkhart <kelly@tradebotsystems.com> writes:
> Ha! So I'm creating an index 98% full of nulls! Looks like this is
> easily fixed with partial indexes.
Still, though, it's not immediately clear why you'd be seeing a severe
dropoff in insert performance after 50M rows. Even though there are
lots of nulls, I don't see why they'd behave any worse for insert speed
than real data. One would like to think that the insert speed would
follow a nice O(log N) rule.
Are you doing the inserts all in one transaction, or several? If
several, could you get a gprof profile of inserting the same number of
rows (say a million or so) both before and after the unexpected dropoff
occurs?
regards, tom lane
