数据库的安全是数据库系统的生命。作为大量信息的存储系统，数据库系统担负着存储和管理这些信息的任务。系统中的数据为众多的用户所共享，数据的泄漏或毁坏将会给社会财富、个人财富带来巨大损失。因此，如何保证数据库系统的安全性，成为迫切需要解决的重要课题。

    本文首先回顾了数据库安全研究的历史、现状，在此基础上对其发展提出了一些看法。随后介绍了数据库安全设计目标、系统管理、安全模型等相关的基本理论，以及Oracle是怎样保护系统安全的。在第四章，研究的是推理通道这一当前数据库安全研究的热点，深入讨论了检测和消除推理通道的技术。

 

 

关键词：数据库安全；Oracle；推理通道；

 

 

 

 

 

 

 

 

 

 

 

 

Database security is considered as the life of the database system. The database system saved a large number of information, bears responsibility for deposit and management of these information.If datas which are shared by mass users are leaked out or ruined， it will bring terrible losing for social and personal wealth. Therefore， how to ensure the database system security becomes important problem which should be solved urgently.

At first,after reviewing history and status quo of researching database security， we put forward many problems of foreground.Then we introduce some primary theories about database security which includes design object，system manage and security model,and show that how Oracle guards its database.In the forth section，inference channel，the focus of database security，is discussed highly in detection and removal.

 

 

Keywords: database security; Oracle;inference channel；