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What is a Star Schema and why is it considered a best practice in Power BI?

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A Star Schema is a data modeling approach where a central Fact table is connected to multiple Dimension tables.

Structure:

  • Fact Table → Contains measurable business data.
  • Dimension Tables → Store descriptive attributes.

Example:

  • FactSales
  • DimCustomer
  • DimProduct
  • DimDate
  • DimRegion

Benefits:

  • Better query performance.
  • Easier DAX calculations.
  • Simplified relationships.
  • Improved scalability.

Star Schema is the preferred design pattern for enterprise Power BI solutions.