Question

I want to execute the following query and put it on a gridview in my asp.net app

select *
from INDICATORS, places, places_sales
where places_sales.id = places.id
and 
INDICATORS.line  in (select line from lines)

the lines table has like a 28000 records and INDICATORS like 18000

This query is executed in oracle sql developer in 6 seconds, but in my asp.net application (with oracle dataacess as connector) takes like 20 minutes

Is there a way to optimize my query?

Answer 1

There are a couple of things you can do to speed it up.

Firstly, is there a join between places or places_sales to INDICATORS?

If there is, you shoul add it, you’re probably getting a cartesian.

Now, for the optimization piece, try the following:

SELECT *
  FROM indicators, places, places_sales
 WHERE places_sales.id = places.id
       AND EXISTS
               (SELECT ''
                  FROM lines l
                 WHERE l.line = indicators.line)