Re: Optimization of query finding related products for a certain product
From: Ron Reidy <ron_at_indra.com>
Date: Sat, 08 Sep 2001 12:58:40 -0600
Message-ID: <3B9A6A60.431ABD31_at_indra.com>
Date: Sat, 08 Sep 2001 12:58:40 -0600
Message-ID: <3B9A6A60.431ABD31_at_indra.com>
Jacob Nordgren wrote:
>
> Hi everybody,
>
> This query finds the related products for a certain product based on
> user visits.
>
> Today this query takes 3 seconds. Is it possible to make it faster
> with the same result?
>
> SELECT PRODUCT_ID FROM VISIT WHERE
> USER_ID IN (SELECT DISTINCT USER_ID FROM VISIT WHERE PRODUCT_ID =
> 1883577330)
> AND PRODUCT_ID <> 1883577330 GROUP BY PRODUCT_ID ORDER BY
> COUNT(DISTINCT USER_ID) DESC
>
> This is the table:
>
> VISIT
> -----
> USER_ID INT *
> PRODUCT_ID INT *
> VISITDATE DATE *
>
> Thank you for your help!
>
> / Jacob
So, have you run EXPLAIN PLAN? Gotten a trace and run it through
tkpro? Using the CBO and have valid, current stats?
-- Ron Reidy Oracle DBA Reidy Consulting, L.L.C.Received on Sat Sep 08 2001 - 20:58:40 CEST