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Message Posted: Tue, 11 Jun 2002 @ 20:40:33 GMT


     
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Subj:   Re: Full-Table Scans and Secondary Indexes
 
From:   Michael Larkins

Hi Clay:

Teradata will only use an index during the process of reading rows. It only uses an index for a join when it is a nested join. All other joins normally involve one or more SPOOL files and primarily uses a merge join.

So, as far as the actual join processing goes from SPOOL, Teradata never uses an index.

Mike



     
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