Finally after more then six months of rescheduling my exam appointments I had the time to do some proper preparation and took the test.
Getting your MySQL developer certificate means that you have to go through two tests. Each of them has 70 multiple choice questions. Both tests will take up to a maximum of 90 minutes.

At Ibuildings we use MySQL a lot. Being a PHP developer you're not always focused on advanced MySQL features. Especially with MySQL 5.0 you can benefit from using those advanced features. Often a developer prefers not to rely on database specific code and tries to resolve this in the application logic. Implementing MySQL's advanced features can benefit you and your users.