| 摘要 |
PROBLEM TO BE SOLVED: To improve the system performance by reducing communication quantity when multiplexing a master file and a duplicate file. SOLUTION: The master file read in from a master area M is cashed in a cashe area b1. A changed data part (a painted-out part) b2 of the cashe area is transferred to a corresponding part of the master area (b3). Thus, the changed data part is multiplexed by the cashe area and the master area, and an unchanged data part is multiplexed by the master area and a duplicate area. The unchanged data part is finally transferred to the cashe area, and duplicate data are integrated into the cashe area as the duplicated area (b4). When making the duplicate file b3, data are preferably transferred only to the master area, so that the communication quantity can be reduced at multiplexing time. COPYRIGHT: (C)2004,JPO
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