| 1. | In addition , distributed database system contains more complex contents than centralized database system . this essay aims to research on the principle , design and realization technology of oracle distributed database system 另外,在查询处理、事务管理、数据的完整性与安全性等方面,分布式数据库系统比集中式数据库系统具有更复杂、更丰富的内容。 |