When an external backup tool is used to back up or unload data, each backup or data stream is given an external backup ID. When a backup has been created to a group of parallel backup media, each part of this backup is given its own external backup ID.
The database system writes the external backup ID to the log file dbm.ebf; it is also displayed in the backup history.
The Loader writes the external backup ID to the log file of the Loader and to the Loader-related system tables. The external backup ID is required when loading and restoring data, to request the required backup or data stream.
See also:
Concepts of the Database System