Abstract:

In order to overcome the botùeneck node in the distributed database system in client/ server mode and to reduce the network transfer load for keeping the data consistency between nodes , a local relation model (LRM) of database based on P2P system is proposed , and the theoretic semantics and architecture of LRM are presented. Moreover, an instance is presented to analyze the data transfer according to domain relation and the way to the realization of coordination formulas between P2P nodes. It is finally concluded that the proposed LRM helps to reduce the data communication between nodes , improve the system reliability and provide flexible sharing on data and service.

Key words: database, P2P system, local relation model, relation space, domain relation, coordination formula