MySQL Developer, meet "Quan" (aka the MySQL Query Analyzer)
May 18, 2009[From MySQL AB and Sun Microsystems, Inc.]
During my years as an application developer I was most in my element when working on projects that involved building applications from the ground up. Somehow taking user and customer pain points and requirements and turning them into a working solution was much more satisfying than upgrading an existing application, fixing bugs, or tracking down and tuning a slowdown, especially when these tasks involved code I had not created. Along the line, I developed and supported applications that ran on SQL Server, Oracle, DB2 (z390!) and MySQL, each of which posed some interesting twists when it comes to proactively tuning code as it is being developed and tested.
The article continues at http://dev.mysql.com/tech-resources/articles/quan_for_developers.html