Note: You are currently viewing documentation for Moodle 3.6. Up-to-date documentation for the latest stable version of Moodle is likely available here: Oracle.
Out of curiosity, what doesn't work on Oracle? We've been using Moodle on Oracle since 1.9 (database enrolments and everything,) and haven't had very many problems at all. The few we've had, we've found fixes and workarounds for, and have submitted them as Tracker issues along the way.