You can recover history file if it is damaged or DB2 cannot access it. DB2 history file stores all information about backup, restore, and changes in the database.
By default, the DB2 database will be in Offline mode. However, you need to set the database in online mode to restore the history files. You cannot restore history files which contain database records regarding recovery and administration events along with the log files. you must disable the restoring of log files and reapplying the logs (roll-forward) on restored database.