MYSQL 线程池

https://www.jianshu.com/p/88e606eca2a5

https://www.percona.com/doc/percona-server/LATEST/performance/threadpool.html

https://www.percona.com/blog/2013/03/16/simcity-outages-traffic-control-and-thread-pool-for-mysql/

http://www.cnblogs.com/cchust/p/4510039.html

http://blog.jobbole.com/109695/

http://blog.csdn.net/u012662731/article/details/54375137