what about running a script to search /var directory for big size files, I will schedule it to run daily, to search any database that's more than 2M size and delete the database itself.
the problem is, this doesn't looked like the right way to "drop" a database, so will it affect the integrity of the mysql server?
PS. I like your blog, I actually started to read it since few month ago, the information in there is very very helpful to me on some occasions.