Change default backup device type

By default the RMAN backup device type is DISK.

Change the default device type for the RMAN automatic channel allocation:
RMAN> CONFIGURE DEFAULT BACKUP DEVICE TYPE STB;

Change the default device type for the RMAN manual channel allocation:
RMAN> RUN {
2> ALLOCATE CHANNEL c1 DEVICE TYPE DISK;
3> BACKUP ... ;
4> }

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NOTES:
SBT - System Backup Tape
CTWR - Change Tracking Writer
RVWR - Recover Log Writer
RMAN - Recovery Manager
ASM - Automatic Storage Management
ADDM - Automatic Database Diagnostic Management
MML - Memony Monitoring Light process
MON - Memony Managaibility Monitoring process
MML- Media Management Layer