| This paper provides a discussion on the theory of distributed database, and then puts forward a synchronous update system model to solve the problems encountered while Lushun Insurance Company was realizing the data share among different kind of databases located in different area. This model can realize data sharing and data consistency among heterogeneous databases by QDBC and TCP/IP technology, and now has been partly implemented.Besides, This paper also discusses the implementation mechanism of distributed directory and simultaneous control of transactions. |
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