http://tech.noredink.com/post/133347435578/optimizing-mysql-for-high-concurrency-on-amazon
Looking for concurrency bottlenecks
performance schema
List the total maximum wait by event inside of InnoDB
SELECT EVENT_NAME, SUM_TIMER_WAIT/1000000000 WAIT_MS, COUNT_STAR FROM performance_schema.events_waits_summary_global_by_event_name ORDER BY SUM_TIMER_WAIT DESC, COUNT_STAR DESC LIMIT 30;
List current and last wait events on InnoDB. -- “what the current, or last completed, wait for each session was, and for exactly how long they waited” SELECT NAME, IF(PPS.
https://medium.com/devoops-and-universe/database-performance-aws-vs-bare-metal-452f64481b07
