求翻译：针对数据库系统中安全机制设置的问题，以一个典型企业数据库系统为例，详细介绍了基于SQL Server2005数据库系统安全机制设置中登录身份模式选择、应用程序验证、创建SQL Server组、设置数据库访问、设置与分配用户权限以及其它安全机制的设置方法。提出了在设置数据库安全机制时，应首先创建全局组，通过SQL Server Users组获得服务器访问，通过具体数据库组获得数据库访问权限，然后根据用户访问需求创建数据库角色并对角色分配权限，最后全局组通过加入角色获得权限的设置方法。本方法已被证明是可行和有效的。是什么意思？

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