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It ensures that the ETL process functions well with other upstream and downstream processes. A Data warehouse implementation is a collection of many components, and hence integration testing is a must. Typically, system testing only includes testing within the ETL application.

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I found this to be a useful, though high level article about data validation. It's more about how to approach the testing than specific tests, but it does contain some specific tests and has a lot …
answered Sep 28 '11 by Sam Woods