RMAN cloning and standbys—physical, snapshot, or logical
In 11g, all databases are now identified uniquely by DBIDs. In earlier versions, every database copy made by a method other than the duplicate command had the same DBID. In previous versions of Oracle, you would use the NID utility to change the DBID and ORACLE_SID for certain cloning procedures to a test database. You couldn't do this for standby databases because changing the DBID or ORACLE_SID would invalidate the configuration and the Data Guard process would not work. This is no longer needed—RMAN can now duplicate a production database for any reason. There is just a small difference in the commands run for the different types.
It is very easy to create a copy of a production instance ...
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