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Definition
Data warehouses are computer based information systems that are home for "secondhand" data that originated from either another application or from an external system or source. Warehouses optimize database query and reporting tools because of their ability to analyze data, often from disparate databases and in interesting ways. They are a way for managers and decision makers to extract information quickly and easily in order to answer questions about their business. In other words, data warehouses are read-only, integrated databases designed to answer comparative and "what if" questions. Unlike operational databases that are set up to handle transactions and that are kept up to date as of the last transaction, data warehouses are analytical, subject-oriented and are structured to aggregate transactions as a snapshot in time.
Overview: ir.iit.edu/~ophir/cs761/DataWarehouseOverview.pdf
More Resources: www.mnhs.org/preserve/records/dwres.html
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