DB: Rman setup with DG

Common rman backup settings to be used

On the primary

CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY BACKED UP 1 TIMES TO DISK;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '+RECO';
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '+RECO';
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+RECO/snapcf_<db>.cf';

On all secondary

CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON ALL STANDBY;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '+RECO';
CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '+RECO';
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '+RECO/snapcf_<db>.cf';