Book Review: Data Virtualization for Business Intelligence Systems
An ugly reality of Business Intelligence development is the immense effort that is required to build and maintain the data warehouses that lie behind such an endeavor, particularly when data is coming in from multiple sources. In a typical situation, this task requires the use of ETL software to load data into the data warehouse, while transforming it to the desired structure. There is an inherent inflexibility in the procedure, since any change in design requires altering the ETL and reloading data.
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