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Message Posted: Mon, 26 Feb 2001 @ 22:15:42 GMT


     
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Subj:   Re: Why not use star schema
 
From:   Claybourne Barrineau

Jeff,

It is my understanding that Teradata considers Star Schemas appropriate (a necessary evil) if a 3rd normal form database design cannot meet the response time requirements of the user.

In our case, we build Teradata Star Schema Datamarts (as part of a ROLAP application solution) weekly from a 3rd normal form Teradata warehouse. I recommend this approach only if you are certain that a 3rd normal form solution isn't fast enough for the user, and you have plently of disk space. Also, if you decide you do need to build a Star Schema, consider building a Multi-table Join Index to pre-resolve your fact and dimension table joins. Our protoype of this design is running very smoothly.


Hope this helps,

Clay



     
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