讨论对于不同类型的工作负载和需求，应该把数据、查询数据库和身份验证源驻留在什么地方。
We'll talk about where your data, query database, and authentication source should reside for various types of workloads and requirements.
对于登陆数据库系统的使用者，采用不同的用户身份登陆以赋予其不同的权限。
For the users who login database system, different limits of authority are given by different user identities.
该方案对于不同权限级别的用户，采用分级的身份鉴别技术，充分保证了账户的移动性和访问的安全性。
This scheme use different authentication mechanism to authenticate users of different level to ensure the mobility and security of user account.
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