Re: Simple Join

On Wednesday 14 December 2005 16:47, you wrote:
> 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.

That's fine, so being a postgres novice, as I stated in my original post, what
would be the best way to improve performance?  Redundant column that's
updated via a trigger?  I'm asking this list because I'd like to do it right,
as opposed to get it done.

>    regards, tom lane