DTA can leverage test servers to tune production servers; DTA transparently offloads tuning load from the production server on to the test server while ensuring that the quality of the results remains the same, had the entire tuning been performed on the production server. This is very attractive in production environments where test servers are extensively available (DBAs try out important changes to their database systems such as patch applications, physical database design changes, and application deployments on test servers before making them available on the production servers.) and one is extremely careful about the load of production servers.