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Message Posted: Thu, 13 Mar 2008 @ 12:53:40 GMT

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Subj:   Retreive the records with minimal spool space
From:   vedamurthy.gy


I need to retrieve only top 1000 (sales) records from a view. The total size of the view is 1.3 TB. When I tried this, it took more than 2 hour. But earlier the same query was taking only 10 minutes.

My query was

     1. sel top 1000 * from employee


     2. sel * from employee
        qualify rank() over (order by employee_number) =1000;

Please let me know,why its taking so much of time and is there any alternative way to write a query to improve the performance.



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