use XXX;
show processlist
28个线程连满了导致登录不上了
https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=baidu&wd=mysql%E8%BF%9E%E6%8E%A5%E4%B8%8A%E9%99%90&oq=%25E7%2589%25B9%25E6%259C%2597%25E6%2599%25AE%25E6%258B%2592%25E6%2589%258B%25E6%259C%25BA%25E5%25AE%2589%25E6%25A3%2580&rsv_pq=a5433d22000345d9&rsv_t=58c4BUP4ipFjD2r7Bv0tr0qoUOs5eYz9iN1u7EckRG%2FxrRk9aK0LCIBoQfk&rqlang=cn&rsv_enter=1&rsv_sug3=15&rsv_sug1=13&rsv_sug7=100&rsv_sug2=0&inputT=4196&rsv_sug4=4197