you can certainly create applications that use NoSQL DB as well as the Oracle database. However, you can't have a single transaction across both databases.
Can you elaborate on what you're trying to do?
Thanks and warm regards.
to have the same "transaction" use both databases, you would need to do something in a stored procedure w/ JAVA.
if you are asking if they can run alongside one another, then the answer is yes. Say you have a PHP application, it could conceivably write data to both data stores at the same time. I suppose from a transactional standpoint, the argument could be made that it is the same transaction from the application side.