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Message Posted: Thu, 17 Mar 2005 @ 10:53:16 GMT

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Subj:   Re: Constraints and indexes
From:   David Wellman


1. Primary Index controls the distribution of data across the AMPs. Even data distribution is very important in temrs of performance in a Teradata environment. The more unique the primary index data values, the more even will be the distribution.

A Secondary Index (SI) is an alternate access path to the data. Using an SI to access the data avoids a full table scan.

The Database Design manual contains lots of details about indexes.

2. The relevant index will be created automatically.



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