参考：https://blog.csdn.net/ivory_town1/article/details/77702357
1.修改参数配置文件
vi /etc/my.cnf
[mysqld]
wait_timeout = 28800
interactive_timeout = 28800
#增加以上两列即可，因为官方文档要求修改此参数必须同时修改interactive_timeout
2.重启数据库
Service mysql restart
3.查看数据库参数是否修改成功
Show variables like ‘wait_timeout’;
https://blog.51cto.com/u_16175434/6742580
mysql5.7大量sleep进程常规处理方式及配置示例 https://www.jb51.net/database/295665m0c.htm
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