除了放入数据之外，机器内存还可以用于操作系统、中间件和应用程序逻辑等。

A machine's memory is used for the operating system, and middleware and application logic, among other things, in addition to the data you put in it.

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使用其他机器的内存进行扩展非常合适。

Using memory on other machines can be great for scaling.

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一定要保证规定的JVM最大堆长度小于机器的物理内存。

Be sure that the JVM maximum heap size specified is less than the total physical memory of the machine.

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