换而言之，在离线备份期间，不允许用户访问数据库。
In other words, users are not allowed to access the database during an offline backup.
如果不允许用户访问包含组件的数据库，那么可以允许他访问含有该组件的页面，但同时又不能访问数据库。
If a user is not permitted to access a database that contains a component, allowing the user to access a page with that component does not give him or her access to that database.
豁免权使用户可以访问其安全标签不允许其访问的受保护数据。
An exemption allows a user to access protected data that their security labels might otherwise prevent them from accessing.
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