The evolution of the concept of the practice
known today as Data Warehousing dates back to late 1980s, [10] invent the term “Business Data
warehousing”. The concept was borne out of the
need for easy access to consolidated and quality
assured organizational data that can be used for
management strategic decisions [8].
According to Inmon DW can be described as a
subject oriented, integrated, time-variant and nonvolatile
collection of data in support of
management’s decision-making [9]. Inmon is
considered as a father of data warehousing. Further,
in 1990,s Inmon lays the theoretical underpinning
of the data warehousing concept. Also, he develops
the DW architecture called Corporate Information
Factory. This architecture has the enterprise wide]
view of company’s data and follows top-down
approach of DW design. (That is, the DW is
designed as a centralized repository for the whole
enterprise. Therefore, dimensional data marts
containing data needed for specific departments are
derived from the enterprise DW only after the DW
has been completely developed). To date Inmon
remain one of the major players in data
warehousing [10].