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Microsoft® SQL Server 2012 Unleashed by Alex T. Silverstein, Chris Gallelli, Paul T. Bertucci, Ray Rankins

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Limitations of a Relational Database

Even using a tool such as SSAS, you face limitations when dealing with a normalized database. Using a view can often solve (or mask) these issues. In some cases, however, more complicated facts and dimensions might require denormalized tables or a dimensional database in the storage component of the data warehouse to bring information together. Data cleansing and transformation are also major considerations before you attempt to present decision makers with data from OLTP systems.

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