Take a look at your data warehouse environment sometime and stop to consider an interesting fact: If you are like most people who have data warehouses, you don't have a "test" data warehouse. Where are all of those procedures you used to put new programs and databases through before putting them into production? Where is the "test" environment that every self- respecting production/transaction/operational environment has?

In the classical online transaction processing (OLTP) environment there was/is the practice of putting everything that was newly developed through the "test" environment. Once the new OLTP code was tested, it was put into production. However, as the world has evolved into the decision support system (DSS) data warehouse environment, the "test" environment seems to have dropped by the wayside.

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