MySQL 性能跟踪方法

https://www.cnblogs.com/zhoujinyi/p/5236705.html

https://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html

https://dev.mysql.com/doc/refman/5.7/en/dba-dtrace-mysqld-ref.html

https://dev.mysql.com/doc/refman/5.5/en/performance-schema-timing.html

https://github.com/iovisor/bcc/blob/master/tools/dbslower_example.txt