鉴于信息的重要性，为信息安全提供保障的容灾系统发展迅速，多种容灾方案相继被提出。典型的容灾系统由SAN和集群技术组建，适用于大型系统。Oracle分布式数据库有着良好的数据冗余机制和数据复制机制，能够保证全局数据的安全性和一致性。集合了两者优点的基于分布式数据库的容灾系统还能够适应各种规模的应用系统，并具有管理方便，部署简单的特点。

For the growing importance of information，the disaster recovery system which can protect the security of information has a rapid development．A variety of solutions have been proposed in recent years．A typical disaster recovery system which consists of SAN (Storage Area Network) technology and clustering technology always applies to large-scale systems．Oracle distributed database provides good mechanism for data redundancy and data replication to ensure the global data security and consistency．This paper combines these advantages, researches on the disaster recovery system based on distributed database which can adapt to systems with different scales．It also can be easily managed and simply deployed．