阿里云RDS CPU100%排查

1、列出所有非sleep进程，发现执行时间较长的进程，定位哪个应用导致的

SELECT * FROM information_schema.PROCESSLIST WHERE command != 'Sleep' ORDER BY time DESC

2、杀死time时间比较高的线程语句，暂时恢复

select concat('kill ', id, ';') from information_schema.processlist 
where command != 'Sleep'
and time > 100
order by time desc

3、恢复正常后，排查慢SQL

4、也有可能需要升级升级内核小版本