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Message Posted: Tue, 28 Jun 2005 @ 17:04:36 GMT

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Subj:   Re: Teradata row distribution and hashing
From:   sanjaya.nagabhushan

  Is there any technique which can help the data architect determine the hash value range if an attribute were added an existing index ?  

1) There is no guarantee that hash value of consecutive values would be consecutive so I don't think we can get a range.

2) You can use the teradata function HASHROW (column list) to get the row hash value of column(s) or constants.

You can consider using a Hash Index or a Single Table Join Index on the child table to ensure AMP local join.



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