Oracle® Data Guard Concepts and Administration 11g Release 1 (11.1)
The OCM objective is:
Configure archivelog deletion policy for the dataguard configuration
This procedure deletes archived REDO log files on the primary once they have been applied to all the standby databases, and deletes them on the standby databases once they have been backed up at least once.
Primary Database
Under RMAN on the primary database,
CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;
Standby Database
Under RMAN on the standby where the backups are done,
CONFIGURE ARCHIVELOG DELETION POLICY TO BACKED UP 1 TIMES TO DEVICE TYPE DISK;