Installing and testing.
I installed Oracle a few times and played with it. I didn't put a proper shutdown method in the shutdown scripts and there was also a mishap while testing the UPS. Both times I was unable to recover the Oracle database and had to reinstall. I had never had that much trouble with mysql. I installed it for someone else that had an Oracle expert and they where able to recover when we had a similar mishap there but all the googling in the world is nearly useless without a properly trained Oracle administrator. I'd suggest sticking with a database where the documentation is fully available and many many more people that can help you. There are easy free forums for mysql, maraiadb and postgresql.