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Message Posted: Mon, 28 Mar 2016 @ 09:53:41 GMT


     
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Subj:   PK used as USI and not UPI
 
From:   Anomy Anom

<-- Anonymously Posted: Monday, March 28, 2016 04:44 -->

Hi All,

What is/are the reason(s) why a PK will be implemented as USI instead of UPI? This question was formulated based on the following statement:

"Primary keys are implemented as unique secondary indexes for non-temporal tables..."

Reference: "Database Design" (Release 14.0); page 296

I think that PK as UPI is better since it will uniformly distribute the rows across all AMPs since PK is always unique by definition.

So why use USI for a PK?

Thank you in advance for any responses.



     
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