| 摘要 |
PROBLEM TO BE SOLVED: To shorten backup processing time and recovery processing time and to improve the data storage efficiency of a portable storage medium, etc., by reducing a data size at the time when a database is backed up on the portable storage medium, etc. SOLUTION: Data of a record part 152 and data definition information 153 except an index part 151 are transferred to the portable storage medium 200 to be backed up when a database 150 on a main storage device 100, etc., is backed up to the portable storage device 200. In the case of recovering the database from the storage medium 200 to the main storage device 100, etc., a record part 252 and the data definition information 253 without an index part are transferred to the main storage device 100, etc., and the index part 151 is regenerated from the record part and the data definition information on the main storage medium 100, etc., to recover the database 150. |
