Re: ORDER BY time consuming

On Sun, Aug 21, 2005 at 12:04:01PM +0200, Ben-Nes Yonatan wrote:
> Hi All,
>
> I got a table with about 4.5 millions rows in it which is connected to
> another table with about 60 millions rows which are used as keywords for
> searching.
>
> I succeded to create fast queries on the first table that finds a row at
> the first table which is connected to up to 4 diffrent keywords at the
> second table and LIMIT the result to 12 (I want to allow the surfers of
> the site to press back and next to see more products so ill make it with
> OFFSET).
>
> I want to be able to order my result by a specific column but when I
> insert ORDER BY into the query (and any other query that I tried) it
> becomes extremly slow, what can I do to solve this problem?

Your question is too generic to answer specifically, but I suspect that
if you use your un-ordered query as a subquery in the FROM clause and
then order that it will work well. IE:

SELECT *
FROM (SELECT ...) a
ORDER BY f1, f2, f3
--
Jim C. Nasby, Sr. Engineering Consultant jnasby(at)pervasive(dot)com
Pervasive Software http://pervasive.com 512-569-9461