| 摘要 |
PROBLEM TO BE SOLVED: To execute useful propagation by always performing access to latest data. SOLUTION: This database system for operating by matching data related to the contents of databases A and B is provided with a data matching means for executing the matching processing, and each station is provided with a changing means for changing the data related with the contents of the database of its own station, an identification information controlling means for setting identification information indicating whether any change is executed by the other station which is set in the database of the other station when the data are changed by the changing means, and a data returning means for detecting whether any change is executed by the other station on the basis of the identification information in response to a request for reference to the database of its own station, referring to the database, and returning the referred result to the origin of the reference request by waiting for the matching of the data by the data matching means when any change is operated by the other station.
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