Oracle has an history of sabotaging opensource projects, it does not work well with their business model.
- 2010, OpenSolaris
- 2010, Java / Android
- 2010, The Document Foundation feared for OpenOffice and forked it as LibreOffice. Oracle finally donated the project after seeing its market share sink rapidly.
- 2012, MySQL is starting to lose its independence.
VirtualBox is still alive, but for how much time ?
MySQL is not the only RDMS, but it is the most popular free one. MariaDB claims to be an enhanced, drop-in replacement for MySQL but if was to switch, I would strongly consider PostgreSQL. It is robust, highly scalable, mature, and feature-rich.
PHP frameworks and CMS with support for PostgreSQL
- Wordpress, as a plugin, might be unstable
- Doctrine which makes Symfony compatible
And probably much more.
Have a look at this very detailed comparison between MySQL and PostgreSQL.