Mobile Agent-based Query Optimization Techniques

Mobile database is a research and implementation hotspot in the fields of database and mobile computing. With the development of integrated circuit and mobile communication technologies, mobile database products will have great growth in user demands.Relative research is mainly focus on replication caching, location management, query optimizing, data broadcast, security, mobile transaction and human-machine interface technologies. Among these topics, research of query optimizing is one of the key technologies.In this thesis we first introduced the development of mobile computing model and adaptation techniques in recent years, and the application of mobile agent. Then we discussed the status of mobile query in detail. After analyzing some existing technique, we present our new mobile query model based on mobile agent. The main contribution of this thesis includes:1. We proposed a new distributed query transaction model based on mobile computing, that is Zone-based Query Transaction Model ,in which distributed query and mobile query unite and are managed together.2. We designed a query optimizing algorithm- A Mobile Query Optimization Algorithm based on Containment and Merging, which can reduce query workload.3. We depicted a query optimizing transaction model based on mobile agent and mentioned its process in details.4. We showed two different methods of dealing with query results contributed to reinforcing the flexibility and adaptation.