Hi Thorsten,
Yes, mapp Database has been tested in combination with both MariaDB (tested with version 10.0.34) and MySQL (tested with version 8.0). If you have doubts with the procedure you can follow the getting started in the online help:
And also you can find more information in the Community:
MpDatabase Startup Guide - Share Info & Ideas - B&R Community (br-automation.com)
Best regards,
Eva