If only the identity of the middle tier service is propagated to the downstream service, the downstream service does not have proper control over audit and authorization of access to the service.

如果只有中间层服务的标识传播到下游服务，则下游服务不能对服务访问审核和授权进行正确的控制。

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Using trusted contexts provides greater control while using restricted, sensitive privileges, and allows middle-tier servers or applications to assert the identity of the user to the database server.

通过使用可信上下文，可以在使用受限制的、敏感的特权时提供更强的控制，并且使中间层服务器或应用程序可以向数据库服务器确定用户的身份。

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Job Scheduler tier, which is part of the Compute Grid component, accepts new job submissions, dispatches the jobs to the end points, and provides operational control over the jobs.

作业调度器层是计算网格组件的组成部分，可以接受新的作业提交、为端点分派作业、并提供对作业的操作控制。

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Lower Tier and the associated command and control.

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