It did not show any error message or the database can not be used, when i upgrade Wordpress before, but when i would like to change the content of my.cnf to optimize the mysql, it seems that has become very difficult. Why do I have to say so? That is because i can access and enable mysql after I changed my.cnf file...
This is a tutorial on how to check your server requirements to make sure you can upgrade to wordpress 3.2, and a review of the new features, and new default 2011 theme that will be released with this new WP udpate.