Design of User Authentication System for Public Security Population Information Remote Query System;

NET Remoting technology can be applied to development of remote query functional modules in hotel management system,and successfully realized a modern city hotel management system for fri.

The design and realization of sensor networks remote query system based on B/S mode are described.

Study on join query processing schemes in a mobile computing environment;

Correct use of outer join query technology can not only reduce the data flow on the network,but also improve the efficiency of system.

So the key of query optimization is optimization of multi-join query.

Technology of Spatial Query and Optimization Based on Oracle Spatial;

Study on Spatial Query and Spatial Analysis Model in GIS Based on OODB Technology;

Nowadays with the maturation of ComGIS technology and the standardization of spatial query language,more and more GIS systems are no longer settling for the existing spatial query and analysis capability.

Parallel multi-join query optimization algorithm based on PC clusters;

Distribution of processors in parallel multi-join query based on PC clusters

Aiming at the issues of complicated multi-join query in the distributed architecture of disaster data management system,this thesis systemically introduces the principles and characteristics of particle swarm optimization(PSO) algorithm,and analyzes the effectiveness of applying PSO to solve the multi-join query optimization problem.