Optimizer tracing used by others!
In a previous post, I had explained how to use MySQL's optimizer tracing , a new feature which appeared in MySQL 5.6.3. As a developer, it feels really good to see others adopt my work and make something useful out of it! My colleague Dimitri Kravtchuk, who is one of our top Benchmarking experts, has written a blog post where he shows how the optimizer tracing has helped him to figure out why, under load, once in a while and randomly, a query performed badly. His investigation technique may be reusable by other people, so I encourage you to read more about it, here .