Performing an offline backup through the agent puts the database in a quiescent state before the backup process begins. The reason for this is that RMAN must be able to connect to the database; therefore, the database processes must be running and accepting connection. Performing a true offline backup does not allow this connection to occur. The only way to allow RMAN to connect to the database and not have it online is to use the quiescent state, which prevents all user transactions from occurring.
Note: To perform a true offline backup, use the agent to back up your database after manually shutting it down. To restore your database, use the agent again, and then manually start up your database.
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