The HiRDB administrator must check that there is a spare file. If there is no spare file, a reserved file must be placed in spare status. If an error occurs in the current status file while there is no spare file, either the status file is placed in the single-operation mode or the unit terminates abnormally.

If a space shortage occurs in the current status file, HiRDB selects a spare file whose size is greater than the current file and swaps the files. If there is no spare file that is larger than the current file, the unit terminates abnormally. When the largest file is being used as the current file, its record utilization factor should be checked.