The following two methods enable you to recover a database from a journal file:
Forward Recovery (roll forward)
Backward Recovery (roll back)
All journal files permit Forward Recovery. Only journal files created with MUPIP SET -JOURNAL=BEFORE_IMAGES support Backward Recovery.
Activate database recovery from a journal file using the MUPIP JOURNAL -RECOVER command; with the -FORWARD qualifier for forward recovery, or with the -BACKWARD qualifier for backward recovery. If something, such as head-disk interference destroys a portion of the database file, -FORWARD recovery must be used because JOURNAL -RECOVER -BACKWARD will have no valid starting point.