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That MariaDB is a robust and long term alternative to MySQL can be seen, for example, in that it is now used for the Wikipedia sites instead of MySQL.
See the MariaDB developer's licence FAQ for more information about the licensing issues around the use of MariaDB.
We have not tested JobScheduler with MariaDB server (August 2013) but have tested it with the MariaDB JDBC connector (version 1.1.3 and newer) and as of JobScheduler version 1.5.x are including the connector in the JobScheduler installation file.
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