This BRBACKUP command option executes the backup in parallel.
Input syntax: -e|-execute <number of copy processes>
Default value: 0
This parameter defines the maximum number of parallel copy processes. If the default value is set to 0, the number of parallel copy processes corresponds to the number of backup devices available (tape devices/disks). If the option -k only is used to determine the compression rates, the number of parallel copy processes corresponds to the number of disks (or logical volumes) on which the database files reside. The same is valid for –w only_dbv and –d rman_prep.
You can also define a different number n of copy processes. This will cause the following to happen:
· Backup to tape
The value n should be less than or equal to the number of backup devices. If you define a value n less than the number of tape devices, this means that you can only use n of the available tape devices in parallel. Should a tape change to one of the tape devices used in parallel be necessary, there is an automatic change to the next free backup device and the backup continues there.
· Backup to disk
The number of parallel copy processes can be greater than the number of disks defined in backup_root_dir|stage_root_dir (but not greater than 255). In this case, one or more disks will be written simultaneously by several processes. If you choose the number of copy processes n to be less than the number of disks, this means that you can only use n of the available disks in parallel. If one of the disks used in parallel is full, there is an automatic change to the next disk which is not yet used and the backup continues there.
Parameters in init<DBSID>.sap: exec_parallel.