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Message Posted: Fri, 09 Mar 2012 @ 13:38:03 GMT


     
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Subj:   Re: Partitioning on different column to PI
 
From:   Frydryszak, Marek

  If the customer number is truly unique and used for access and we want to use partitioning on a date / timestamp column, then the best solution would be to combine both columns in the primary index and partition on the date column - is this correct?"  


NO !

If customer number is used for access, after adding date to PI all 1-amp queries will be all-amp and you will face dramatic performance degradation.

On the other hand changing UPI to non-unique PI will not be noticeable from performance point of view. The only disadvantage is loss of the unique constraint.



     
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