Distributed Database System Based On Active Network

With the rapid developing on Internet and related technologies, Distributed Database System(DDBS), compared with share-based DBS, will become the dominated application in future's network environment. However, differences in network structure, protocol and bandwidth have become a several issue that DDES should overcome when data flows pass through the network nodes. The concept on Active Network (DARPA,1994), which rises a popular discussion now, provides a new approach on dealing with the bottleneck on DDES design as well as a environment on network, running system by inserting customized program. Thus, introducing the advance in Active Network and discussing how to improve the performance of DDBS with AN technologies become the key point of this paper.In the first part we present the background and mechanism of DDBS and Active Network. In the second part we discuss the issues on DDBS in current networking environment. In the third part we describe how to apply the idea of AN to improve the flexibility and the reliability in Internet applications. The fourth part introduces a Node OS and Executive Environment scheme we design to implement a AN-based DDBS model in practice. In the last part , we give some suggestions for the DDBS design, considering the extension of network and implementation of a large-scale active reliable multicast protocol in future's network.All problems mentioned above were derived from practical project. For industry and research use, the conclusion and suggestion in the paper will benefit working engineers in the distributed database system design and network application areas.