| 摘要 |
PROBLEM TO BE SOLVED: To provide a multiplex database system, capable of performing synchronization of a database server with minimized synchronization data and optionally separating or incorporating a database server without making the whole system foiled. SOLUTION: In response to a synchronization request (incorporation request) of a new server 100, the intermediation device 200 acquires a snapshot from a server 100 in normal operation to restore a database 101 of the new server 100. The intermediation device 200 accumulates a query from a client after forming the snapshot as differential information, and transfers the differential information after restoration of the database from the snapshot in the new server 100. COPYRIGHT: (C)2007,JPO&INPIT
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