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The process of aggregating business data into business intelligence
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Data Warehouse is subject oriented, integrated,
non-volatile and time variant collection of data
in support of management's decision
This is where you can use your data for business intelligence. Tools like Oracle Hyperion, SAP Netweaver, Cogue, Jasper Soft, Microstrategy, Business objects.
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Data warehousing is the process of constructing and using a data warehouse. A data warehouse is constructed by integrating data from multiple heterogeneous sources that support analytical reporting, structured and/or ad hoc queries, and decision making.