We've built a 350GB data warehouse to house personnel records. We are currently having performance trouble. I believe it to be because the data warehouse was designed in a relational schema instead of dimensional schema (i.e. Star). What magnitude of performance improvement could we expect to see if we were to redesign the data warehouse using a dimensional schema model such as a star schema?


Douglas Hackney's Answer: Impossible to accurately estimate without actually running a test with your data on your server on your RDBMS. If your existing model is normalized you could easily see an order of magnitude or more reduction in response time. In a standard scenario, normalized models are the worst possible world for ad hoc query utilization, both for the users and for performance.

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