数据库也会为服务器进程分配私有的内存空间，这块空间叫做PGA(程序全局区)，那里存放着私有的进程和会话信息。

It will also allocate a private memory area called PGA, where it stores what is private to the process and to the session.

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一旦通信会话开始时，打印机将获得足够的信息最有效地分配缓冲区的大小和数量。

Once a communications session has begun, the printer will obtain sufficient information to most effectively allocate the size and number of buffers.

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