共享内存提供了最快的进程间通信方法，因为它以内存传输的速度来处理读写消息。
Shared memory provides the fastest method of interprocess communication, because it processes read and write messages at the speed of memory transfers.
在这两者之中，实例都是指后台进程与共享内存的组合。
In both cases an instance is a combination of background processes and Shared memory.
实例实例进程和共享内存；在DB 2中，它还包含一个永久目录结构。
Instance Instance Processes and Shared memory; in DB2, it also includes a permanent directory structure.
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