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Message Posted: Tue, 09 Jul 2002 @ 15:47:16 GMT


     
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Subj:   Re: Uniform Distributions from RANDOM number function
 
From:   Maxwell, Donald

This may be off-topic (or it may be a dumb idea from the uneducated Peanut Gallery), but doesn't Teradata already generate a unique surrogate called ROWID that accomplishes exactly what you want? (unique identification of a row)

To guarantee uniqueness across all batch load cycles, you could prepend either MAX(ROWID) from PROD or a unique ROWID per batch cycle (a simple BatchID table with integers 1 to 1,000,000 or whatever )

I guess what I'm suggesting is Fastload to a table unique on your multi-part natural key and let Teradata generate ROWID. Then, INSERT- SELECT to your production target using BatchROWID || ROWID as your Unique Primary Index.

I'm prepared to be roasted for this idea, so fire away!

Donald



     
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