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Along with traditional database technology becomes increasingly sophisticated, computer network technology and the rapid development of the expansion of the scope of application, Database applications have generally built on top of the computer network. Then centralized database system showed its deficiency : data according to the actual needs of the distribution network storage, adopt centralized processing, it is bound to cause great communication overhead; Application procedures concentrated in a single computer run, Once the computer failure, the whole system be affected, reliability is not high; centralized processing system caused the size and configuration are not flexible enough, the system's expandability worse. In this situation, centralized DB "Centralized" to the concept of "distributed computing" concept development. Distributed Computing mainly reflected in the client / server model and distributed database architecture aspects. The papers will be widespread introduction of these two technologies

Becoming riper with traditional database technology, development and expansion of range of application at full speed of computer network technology, the database is employed and already generally set up in the computer network. The centralized type database system demonstrates its deficiency at this moment: The data have already distributes and stores in the network according to the need of reali