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Message Posted: Mon, 04 Nov 2002 @ 16:14:20 GMT


     
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Subj:   Re: Secondary Indexes on an Active Data Warehouse
 
From:   David Wellman

Matthew,

Check your index columns to see how non-unique they are. The more non-unique they are the worse the data loading run-times will be. In addition, if the index is too non-unique then it is unlikely that the index will be used much by the optimiser anyway -- which begs the question do you actually need the indexes?

Also don't forget that to really use the indexes once you've dropped/created them or done a bulk-load into the table you will typically need to re-collect statistics on them.


Cheers,

Dave

Ward Analytics Ltd: Information in motion (www.ward-analytics.com)



     
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