Relational Data Modeling - Data Model

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The difference between model (ER, Dimensional, Vault) has everything to do with terminology and method.

There are two basic types of physical models :

E-R models are designed to minimize data storage redundancy and optimize data updates.

Dimensional models are designed to enhance understandability and to optimize query performance.

  • Data Vault

The Data Vault consists of three primary entity types:

  • Hubs,
  • Links,
  • and Satellites.

The Hubs are core business keys, the Links form all relationships, and the Satellites provide all descriptive information.

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You can represent any object in a database using just four tables.


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