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Dimensional Models

By On June 14, 2011 · Leave a Comment · In Data Warehousing

Building off Dimensional Modeling 101 here are some examples and more detail around specific dimensional models

Three basic types of dimensional models

  • Star model
  • Snowflake model
  • Multi-star model

NewImage

Star model

Star schemas have one fact table and several dimension tables. The dimension tables are not denormalized.

StarSchema

Snowflake model

Further normalization and expansion of the dimension tables in a star schema result in the implementation of a snowflake design. A dimension is said to be snowflaked when the low-cardinality columns in the dimension have been removed to separate normalized tables that then link back into the original dimension table.

SnowFlake

Multi-star model

A multi-star model is a dimensional model that consists of multiple fact tables, joined together through dimensions. The image below depicts this, showing the two fact tables that were joined, which are EDW_Sales_Fact and EDW_Inventory_Fact.

MultiStar

 
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About The Author

Joshua Burkhow

Joshua is working to become a Data Scientist with focus on Analytics, Big Data, Machine Learning, and Statistics. His passion for Data and Information are second to none. He is a certified IBM Cognos Expert with more than 10 years experience in Business Intelligence & Data Warehousing, Analtyics, IT Management, Software Engineering and Supply Chain Performance Management with Fortune 500 companies. He has specializations in Analytics, Mobile Reporting, Performance Management, and Business Analysis.

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