Red Hat, Debian, Fedora, OpenSuse, Slackware, and even Wikipedia are moving (or moving) to MariaDB. This means that it is stable. Additionally, MariaDB (and Percona Server) seems to fix security issues much faster than Oracle.
Since MariaDB is compatible with MySQL, all APIs are compatible, including the Ruby on Rails API. (Well, MariaDB 10.0 is not fully compatible with MySQL 5.6, but incompatibility is not at the API level!)
Federico razzoli
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