随着计算机技术及互联网技术的快速发展，人们逐渐进入现代化信息时代。利用各种现代化信息手段，人们 的工作及生活都变得更加便利。但同时，也有不法分子利用网络的便利性不断进行网络安全攻击，使网络数据库安全受到威 胁，信息的传输及处理受到影响，为此就需制定一套完善的网络数据库安全机制以保证网络数据库的安全性。文章简单概述 了网络数据库安全机制的基本概念、网络数据库的模式及其安全机制模型，分析了网络数据库各层的安全机制，并讨论了利用 DBMS 安全机制来防范网络攻击问题，旨在为提高网络数据库的安全性提供若干建议。

With the rapid development of computer technology and Internet technology, people gradually enter the modern era of information. Using a variety of modern means of information, people’s work and life become more convenient. But at the same time, there are criminals making the network security attacks. The security of network database is threatened, and the transmission and processing of information are affected, therefore a set of perfect security mechanism of network database needs to be developed to ensure the network database security. This article briefly introduces the basic concepts of network database security mechanism, network database model and its security mechanism model, analyzes the network database security mechanisms in each layer, and discusses on the use of DBMS security mechanism to prevent network attacks, so as to improve the network database safety and provide some suggestions.