RAR压缩包含呼叫数据记录的语音广播。
通过对呼叫数据进行加密、消息认证和数字签名，防止内部攻击，实现安全细粒度控制。
By the way of encryption, message authentication, and digital signature, the Call System can defense the interior attacks and achieves fine-grained security.
现在假设数据库足够聪明，可以感知到大量排序溢出到磁盘上，这时可以呼叫数据库管理员，把问题告诉他们。
Now imagine if the database were smart enough to sense that a large percentage of sorts were spilling to disk and paged the DBA to inform them of the problem.
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