In this blog post, my colleague Jørgen Løland
described a new feature of MySQL 5.6: Optimizer Tracing. I
recommend reading his article, as it presents this new feature in
a simple, easy-to-read manner.
The Optimizer Tracing feature can help understanding what the Optimizer is doing; it is available since milestone 5.6.3, announced October 3rd at Oracle Open World (here is the changelog). It's good to see it mature now; I …