The X-axis is time, the left Y-axis is response time in seconds, and the right Y-axis is the number of user connections.
x轴是时间，左边的y轴是响应时间，单位为秒，右边的y轴是用户连接的数量。
If you exceed the maximum number of user connections, you receive an error message and are not able to connect until another connection becomes available.
如果超过了用户连接的最大允许值，将收到一条错误消息，而且直到出现一个可用连接之后才能建立连接。
When the connection concentrator is enabled, max_connections limits the number of user connections, and max_coordagents limits the number of agents serving transactions.
当连接集中器是启用的时，max_connections 限制用户连接的数量，max_coordagents 限制服务于事务的代理的数量。
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