The extreme element algorithm and its application in the global query optimization;

In the distributed environment,the cost function space shape of global query includes many partial minimum status,so need to do partial optimization for some times in oder to find the global minimum status.

On the basis of analysis of multidatabase data model principle,this paper discusses queryprocessing problems in MDBS:query decomposition,query transformation and query optimization,and gives a global query decomposition algorithm and a global query optimization approach.

A probabilistic approach for movement trend query processing;

Research of data query processing algorithm for wireless sensor networks;

Design and implementation of query processing system of native XML database:XSQS;

Query Process and Optimization for Active Real-time Embedded Database;

It can reduce the response time of query process.

The distributed data query is the core of the distributed database managing system,but the optimized query algorithm is the key technology in query processing.

This paper firstly analyzes the scheduling of post-query processing in heterogeneous data integration and introduces the global query graph for post-query processing.