A data warehouse is a database that holds business information from many sources in the enterprise, covering all aspects of the company's processes, products and customers.
Data warehouse is a collection of data designed to support management decision making and contains a wide variety of data that present a picture of business condition at a single point in time. Development of a data warehouse includes development of system to extract data from business database plus installation of a warehouse includes development of system to extract data from business database plus installation of a warehouse database system that provides managers flexibible access to the data. The term data warehousing generally refers to the combination of different data such as competitors data, historical data etc. Used by big organization.
For example, is Sears, their data warehouse currently is a 70TB system with 250 billion pages of stored text.
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