Primary copy method and its modifications for database replicationin distributed mobile computing environment

摘要

Rapidly expanding cellular communication technology, wireless LANsand satellite services have made it possible for mobile users to accessinformation anywhere and at any time. In a mobile computing environmentreplication might be considered as an essential technique providingreliability, throughput increase and data availability. This paperaddresses the replica control protocols with an emphasis on workstationmobility issues. The modifications that have to be made to the primarycopy method for replicated database management strategies in order toaddress the effect of mobility on the existing replica control protocolsare analysed and proposed. A variation of the primary copy algorithm,called virtual primary copy method is proposed and it is shown that thismethod is well suited for the distributed mobile computing environment.The performance of virtual primary copy method comparative totraditional primary copy method using computer simulation is analysed