| 摘要 |
PROBLEM TO BE SOLVED: To attain parallel operation of database managers. SOLUTION: The database duplication device 12 for issuing the same query text to a plurality of database managers 16-1 to 16-n and maintaining the same execution orders of the query text in the plurality of database managers 16-1 to 16-n, thereby maintaining same database contents managed by the plurality of database managers 16-1 to 16-n comprises an order assignment device 13 receiving a query text issued from any one of clients 11-1 to 11-n, assigning an execution order to the query text, and duplicating the query text with the execution order; and order control devices 15-1 to 15-n issuing, based on the execution order assigned to the query text, the duplicated query text to the corresponding database managers 16-1 to 16-n, the devices being set for each database manager 16-1 to 16-n. COPYRIGHT: (C)2007,JPO&INPIT
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