Kevin Brown <blargity@gmail.com> writes:
> I'm running 8.1 installed from source on a Debian Sarge server. I have a
> simple query that I believe I've placed the indexes correctly for, and I
> still end up with a seq scan. It makes sense, kinda, but it should be able
> to use the index to gather the right values.
I continue to marvel at how many people think that if it's not using an
index it must ipso facto be a bad plan ...
That plan looks perfectly fine to me. You could try forcing some other
choices by fooling with the planner enable switches (eg set
enable_seqscan = off) but I doubt you'll find much improvement. There
are too many rows being pulled from ordered_products to make an index
nestloop a good idea.
regards, tom lane