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Message Posted: Tue, 04 Jan 2011 @ 09:14:08 GMT


     
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Subj:   Teradata architecture questions?
 
From:   desai kaushik

1.) primary index access rows using only row hash.

if two different primary index values come out of a hashing algorithm with the same row hash value like

     data values    1254    7769   <- data values
                             |          |
                            \/         \/
                          hash algorithm
                            |           |
                           \/          \/
                         22936     22936

how teradata handles this conditions?

i know there is concept of adding a uniqueness value, but can any one explain how it is been used for accessing rows even though we have not specified uniqueness value in our query.



     
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