这通常取决于您后台的构架方式。

This typically depends on how your back-end is architected.

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d：让knockd作为后台守护进程运行，这是标准运行方式。

D: Makes knockd run as a background daemon, which is the standard way to run it.

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接下来，我们来看看内存架构、后台进程和线程，比较一下在Oracle和DB 2中使用它们的方式。

Next we'll look at the memory architecture, background processes and threads, and will compare and contrast the way they are used in Oracle and DB2.

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