| 摘要 |
PROBLEM TO BE SOLVED: To provide so called full-scale "parallel DB editing" in which a computer permanently holds a replicated DB, although conventionally it is common that a database is set in a server and a plurality of computers access it. SOLUTION: The replicated DBs of respective computers synchronize with each other by mutually exchanging edit information of the replicated DB between computers. All related PCs take out editing records on local editing in each PC in uniquely specified order (the order of arrival to the server), and update a local original copy DB. The local original copy DB is updated by processing the edit information of the same contents in the same order and by the same logic, so that the local original copy DBs of each PC obtained as a result are synchronized. This is not synchronization in real time, but the synchronization taking the order of editing records as the time axis. Consequently mixed operation is possible, wherein "mostly online operation" which frequently takes in and updates editing records and "mostly offline operation" of long update cycle are mixed. COPYRIGHT: (C)2011,JPO&INPIT
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