这个选项根据主机名或 IP 地址限制对 TCP 服务的访问。
When used, this option restricts the access to TCP services based on the host name or IP address.
然而，如果两个或更多进程要使用共享内存进行通信，那么它们需要有相同的地址空间，从而限制了它们所能使用的地址。
However, if two or more processes want to communicate using Shared memory, they need to have the same address space, thus limiting the addresses they can utilize.
答案是：因为地址空间受到限制，地址空间可能容不下一个更大的缓冲池！
The answer is: Because the address space is limited, a large buffer pool may not fit into the address space!
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