Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Data virtualization is the abstraction of data contained within a variety of databases so that they may be accessed without regard to their physical storage or heterogeneous structure. Data virtualization is a method of data integration and is often referred to as data federation, enterprise information integration (EII) or data services. This concept is commonly used within grid computing, cloud computing and business intelligence systems.

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