| 摘要 |
PROBLEM TO BE SOLVED: To maintain consistency between a master table in a basic server and a replica table in a division server without increasing a communication load. SOLUTION: The basic server 100, when updating a record on a master table in the server, sends a lock request for a corresponding record on a replica table to an update lock management apparatus 300, and then stands by for the notification of a successful lock. The division server 200-1, when updating a record on the replica table in the server, sends a lock request for a corresponding record on the master table to the update lock management apparatus 300, and then stands by for the notification of a successful lock. If the lock-requested record has been locked, the update lock management apparatus 300 holds the lock request therein and, when the record is unlocked, notifies a successful lock to the requester of the lock request. COPYRIGHT: (C)2006,JPO&NCIPI
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