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...Introduction data warehousing a is technique for collecting and managing from varied sources to provide meaningful business insights it blend of technologies components which allows the strategic use electronic storage large amount information by designed query analysis instead transaction processing process transforming into making available users in timely manner make difference modeling warehouse includes top down requirements driven approach fact tables dimension multidimensional model star schema support roll up drill pivot time phased temporal operational logical physical models normalization denormalization granularity level detail olap online analytical an answer multi dimensional queries swiftly computing part broader category intelligence also encompasses relational databases report writing mining advantages platform all types planning budgeting reporting calculations are consistent cube this crucial benefit disadvantages requires organizing these schemas complicated implemen...