Oracle RMAN – How to Clear All Configurations

Some things which might help:

Don't backup into a single file.

allocate CHANNEL d1 DEVICE TYPE disk maxpiecesize 32768M format some_backup_path

Use as many channels as you can stand.

allocate CHANNEL d2 DEVICE TYPE disk maxpiecesize 32768M format some_backup_path

allocate CHANNEL d3 DEVICE TYPE disk maxpiecesize 32768M format some_backup_path

allocate CHANNEL d4 DEVICE TYPE disk maxpiecesize 32768M format some_backup_path

RMAN parallelizes based on the number of channels you allocate; each channel takes part of the work to do.

Have faster disks - both on the system being backed up AND on the system to which backups are being written. Are you backing up the database over the network? If so, you're limited by the transmission speed of the network and competing network traffic - probably database-related activity.

The db_recovery_file_dest includes a variety of files, including online AND archived redo log files; take a look at the Oracle Backup and Recovery User's Guide chapter 5 to find out the best solution; disabling db_recovery_file_dest is not a good idea. You can try

RMAN> report obsolete;

RMAN command to see what can be deleted. Then do a delete obsolete to delete them. Do you have any guaranteed restore points defined?

RMAN> list restore point all;

If you see any results with type GUARANTEED, if they are no longer needed, remove them:

SQL> DROP RESTORE POINT before_app_upgrade;

Is flashback database enabled?