Posted by The OTN forums, which should be a plethora of knowledge and learning, were always hampered by the hideous interface.
But, changes are coming. It will be interesting to see what transpires
https://wikis.oracle.com/display/Forums/OTN+Forums+Migration+and+Upgrade
Learning is not a spectator sport 
MariaDB ? 😀
Let’s see if the June 10 attempt is successful…