Follow these steps to configure RMAN backups in Data Guard environment. When you want to managed the archivelog deletion policy from one centralpoint.
CONFIGURE ARCHIVELOG DELETION POLICY
Possible options :
APPLIED ON STANDBY - enables flash recovery area to delete archivelogs that are applied on mandatory standby.
NONE - enables flash recovery area to delete archivelogs that are backed up to tertiary device and that are obsolete based on the configured backup retention policy. This is the default configuration.
CLEAR - clears the deletion policy and returns the specified configuration to default value. The default value is NONE.