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Message Posted: Mon, 10 Apr 2006 @ 10:49:25 GMT

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If you select your identity column as UPI too, you will have a great even distribution, if is NUPI the distribution could be skewed if a very skew column is selected ( but is not you case if you select the identity column with NO CYCLE).

For performance, if you access to the data by REFERRER_ID either UPI or NUPI you will do a One-amp operation... Very performant in both cases... The difference will be the number of rows returned..

Andrea Cappelli
NCR Italia
Teradata Professional Services
Teradata Certified Implementation Specialist V2R5

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