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Data Warehouse—Time Variant

  • The time horizon for the data warehouse is significantly longer than that of operational systems
    • Operational database: current value data
    • Data warehouse data: provide information from a historical perspective (e.g., past 5-10 years)
  • Every key structure in the data warehouse
    • Contains an element of time, explicitly or implicitly
    • But the key of operational data may or may not contain “time element”

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