Testing infrastructure changes
Real Application Testing (RAT) is an Oracle Database Enterprise Edition option that allows you to test out the effects of major or minor infrastructure changes on your database.
This may include any changes at the database layer or below, such as database upgrades from 9.2, 10.1, or 10.2 to 11g, moving from a single-instance database to a RAC database, migrating to a different OS, using a different storage subsystem, moving to Exadata, and so on. It may also include database patches, initialization parameter changes, optimizer setting changes, and so on.
RAT includes Database Replay as well as SQL Performance Analyzer (SPA). Both of these components of RAT can be fully executed via Enterprise Manager Cloud Control ...