WHAT RDBMS ( SQL SERVER/ ORACLE ) close to manage MYSQL(DBA)
You can refer MySQL certification exam program and read MySQL documentation to know better about MySQL.

MySQL is much easy to setup and learn than SQL server and Oracle. 

http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=458&amp;get_params=p_track_id:MDBA