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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