| 摘要 |
PROBLEM TO BE SOLVED: To provide a distributed database system that guarantees the content of a database even in the case of a system requiring control periods to be guaranteed. SOLUTION: In a matching method whereby a database is updated periodically, the side which makes updates distributes the database periodically to another database server regardless of whether or not there has been an update. The database server which receives the database monitors the term of validity of the received database so as not to use any database that has expired. COPYRIGHT: (C)2007,JPO&INPIT
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