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Approaches-Data warehouse fundamentals-part 2


There are two ways of approaches to Data Warehouse.
  • Top Down approach or Inmon Approach
  • Bottom Down approach or Drill Up Approach Or kimball approach
INMON APPROACH (TOP DOWN APPROACH OR DRILL DOWN APPROACH)
  • First build data warehouse and then load data marts

  • Faster approach
  • Bill Inmon definition on data warehouse is – “It is a subject oriented, nonvolatile, integrated, time variant collection of data in support of management's decisions”.
  • Data mart are dependent on DWH























RALPH KINBALL APPROACH (BOTTOM UP APPROACH OR DRILL UP APPROACH)

  • Ralph Kimball definition on data warehouse is – “Data warehouse is the conglomerate (Composed of heterogeneous materials or elements) of all data marts within the enterprise. Information is always stored in the dimensional model”.
  • First build Data Mart and then build data warehouse.
  • Data marts are independent.
  • Slow Approach



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