Show TOC

Syntax documentation-e|-execute Locate this document in the navigation structure

This BRBACKUP command option executes the backup in parallel.

Syntax Syntax

  1. -e|-execute <number of copy processes>
End of the code.

Default value: 0

Possible value:

<number of copy processes>: defines the maximum number of parallel copy processes. When set to the default value of 0, the number of parallel copy processes corresponds to the number of backup devices available (tape devices or 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|only_rmv and -d rman_prep.

You can also define a different number n of copy processes. This causes 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 is 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 unused disk and the backup continues there.

See also:

Parameters in init<DBSID>.sap: exec_parallel.