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Teradata Physical Database Design by Tom Coffing, Leah Nolander

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Chapter 7 - Denormalization

“Insanity: doing the same thing over and over again and expecting different results.”

-Albert Einstein

Denormalization

A Teradata data warehouse is designed to utilize a Third Normal Form model, but there are thousands of users and often thousands of databases and tables. For performance reasons, after the model is complete and access and tendencies are understood, denormalizing can be a benefit.

Here are the fundamental denormalization techniques:

  • Derived Data
  • Repeating Groups
  • Pre-Joins
  • Summary and/or Temporary Tables
  • Partitioning (Horizontal or Vertical)

Make these choices AFTER completing the Logical Model.

  • Keep the Logical Model pure and untainted.
  • Keep the documentation of the physical model current.

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