| 摘要 |
PROBLEM TO BE SOLVED: To suppress inter-data mismatching in a plurality of data dispersedly arranged in a distributed database system.SOLUTION: A distributed database system including a plurality of database devices includes: a lock manager 10 for receiving a lock acquisition request from each of a plurality of database devices 20, and for requesting the lock of the master record of data included in the lock acquisition request, and for returning a response to the lock acquisition request to the database device 20 which has made the lock acquisition request; a record lock propriety determination part 22 for receiving the response, and for, before updating a plurality of data, confirming whether or not the master data are locked; and a record update part 24 for, only when the master data are locked by the own database device 20, updating a part or the whole of the plurality of data. |
