This parameter is only relevant for Standby Database and Split Mirror Backup.
The connect string to the primary database instance is defined with this parameter so that BRBACKUP can log onto the primary database.
Syntax: primary_db = <conn_name>
Default value: None
<conn_name>: Connection name from TNSNAMES.ORA for the connect from the standby host to the primary (that is, production) database.
primary_db = C11_PRIM