Except for the inefficient way Oracle handles dates, Oracle is almost as good as DB2. With both of them, the problems are not with the database. The problems are with people who have no clue how to design a relational database. Need I mention Accenture, which subs all the important work in a chain of subs of subs that results in the actual work being done by extremely low paid, low skilled workers.
Modern Oracle is now a mainframe with proprietary everything (as plugins but you only get the benefit of any Oracle product if you buy all the other Oracle products also.) But, of course, Oracle wants to pretend that it is not a mainframe and is somehow different because they say so.
Air Forced dumped its product after 5 years of trying, DOE is next to toss it.... lots of down time per my experiences as a user ....