| 摘要 |
PROBLEM TO BE SOLVED: To reduce load concentration on a master DB in the synchronous processing of DBs.SOLUTION: In the synchronization of DBs between a synchronous processing providing device and a plurality of data processors via a network, when the data in the DB of a certain data processor are changed, control data for identifying data to be synchronized as the changed data are generated, and the control data are transmitted to the synchronous processing providing device. The synchronous processing providing device receives the control data, and transmits the control data to the other data processors. The other data processors accept the use of data, and when the data are associated with the control data indicating that the data are the data to be synchronized, request synchronous processing for synchronizing the data to be synchronized to the synchronous processing providing device. The synchronous processing providing device requests the transmission of the data to be synchronized to the data processor holding the data to be synchronized, and when the data to be synchronized are transmitted from the data processor, transmits the data to be synchronized to the other data processors. |
