max - size元素定义允许的最大并发连接数。
The max-size element defines the maximum number of concurrent connections that are allowed.
如果一个服务器能够预先估计可能会产生的最大并发连接数，服务器可以投递一个使用零缓冲区的receive在每一个连接上。
If a server anticipates handling a very high number of concurrent clients, the server can post a single zero byte receive on each connection.
它指定了可以连接到数据库的并发应用程序(本地和远程)的最大数量。
It specifies the maximum number of concurrent applications (both local and remote) that can be connected to a database.
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