A look at Falcon Diagnostic Tables
April 7, 2008[From MySQL AB]
Performance tuning is one of the top disciplines (if not THE top discipline) that database professionals want to excel at. Being able to take a system that's running sluggish and turn it into one that's running as fast as a scalded dog is a talent that's part art and part science, but whatever the combination necessary to make it happen, there will always be strong demand for folks who are good at it.
The article continues at http://dev.mysql.com/tech-resources/articles/falcon-diagnostic-tables.html