OpKey uses MySQL database on back-end. A central Database is installed on Server machine and all Opkey Authoring/Admin/Agent utilities are connected to that database. So, OpKey requires a database either on same machine or on server machine.
OpKey supports various databases for organizing data in a particular way. The MySQL database along with OpKey provides high performance, high reliability and is easy to use interface to its users. One of the important features of this database is that it can work on various platforms, as required with OpKey. If the database setup is not available, then the user can download it from this link: http://dev.mysql.com/downloads
For detailed information on creating OpKey database, please refer : https://opkey.crestechglobal.com/user-guide/pages.php?subid=67&accordid=2