Oracle: Real Application Testing with Oracle Database 11g

Real world testing of OS, server, or software changes is something that all DBAs wish they could do, and now they can. The database replay feature in Oracle Database 11g lets administrators do the kind of real-world testing that is essential to application performance. Working with Oracle Active Data Guard, the replay feature lets you freeze a snapshot of the standby database for replay later on, only with any changes administrators want to test. When the testing is done, the standby database resumes its backup duties, never interrupting the production system for testing.

More information in: http://www.databasetestingcenter.com/Pages/Rat.aspx