| 摘要 |
PURPOSE:To acquire spare data for the recovery of a fault by the minimum number of recording media and to perform management for the generating of data by outputting backup only when the data is updated. CONSTITUTION:An update flag to show that the data is generated newly or is updated is provided. And only the data on which the flag an attached is outputted to a retention file 8 after updating, and all data names are outputted to a data name managing list at the time of outputting to the retention file 8, and at the time of recovering a data base, only the data whose data name is registered in the data name managing list 9 is recovered. In such a way, it is possible to acquire the spare data for the recovery of the fault by the minimum capacity of recording media, and to perform the management for the data extending over plural generations. |
