官方解释：
interactive_timeout
The number of seconds the server waits for activity on an interactive connection before closing it.
等待一个交互进程变成活动状态的最长时间
wait_timeout
The number of seconds the server waits for activity on a noninteractive connection before closing it. This timeout applies only
to TCP/IP and Unix socket file connections, not to connections made using named pipes, or shared memory.
等待一个未交互进程变成活动状态的最长时间
首先理解交互进程，它指的是这个进程正在等待该进程的提交、撤销操作；未交互进程指的是该进程的一个操作已经完成，正在sleep，等待下个操作进行。
实际操作看看这两个参数的效果：
SET GLOBAL interactive_timeout=20;
SET GLOBAL wait_timeout=50;
| s1 | s2 |
| start transaction | |
| update t set c1 = 1; | |
| 等待20s不提交 | |
| 发现直接被断开 | |
| update t set c1 = 1 | |
| 等待50s | |
| 被直接断开 | |
PS： wait_timeout 设置为大于数据池执行心跳探雷的时间