| 摘要 |
PROBLEM TO BE SOLVED: To provide a distributed synchronous information system capable of efficiently synchronizing data stored by respective apparatuses without requiring a lot of storage area. SOLUTION: A relational database 102 stores an updater updating a line and an event number for deciding whether it is before or after the update in each the updater correspondingly to data of each the line. An update information transmission requirement means 106 of a machine A 100 retrieves a maximum event number in each the updater in reference to the relational database 102, and transmits update information transmission requirement including it to a machine B 110. An update information transmission means 107 of the machine B 110 extracts the update on and after the maximum event number in each the updater included in the update information transmission requirement from the relational database 102, transmits it to the machine A 100, and makes the relational database 102 of the machine A be updated. COPYRIGHT: (C)2007,JPO&INPIT
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