服务器冗余技术在解决传统分布式环境的可用性和性能瓶颈问题的同时给系统的管理带来了新的挑战。介绍了一种分布式数据库服务器的构成原理及工作模型，重点讨论了它的冗余关系、基于移动代理的负载平衡模型及其性能分析等。

The technology of redundant services has improved the system availability, but also poses new challenges to the distributed system configuration management. This paper introduces the model of structure and work for a distributed database server system, and discussions are focused on its redundancy relations, model of load balancing based on mobile agent and performance analysis.