How well, if at all, does Oracle NoSQL database integrate with Oracle RDBMS?
Oracle NoSQL Database integrates well with the Oracle database.  You can run an SQL query in Oracle Database that can reference data in the Oracle database as well as NoSQL Database.

Please see the Oracle NoSQL Database documentation for more details on external tables support.

You can also get an overview of the latest release here:
http://www.youtube.com/watch?v=VT2n1QhIprQ

I'd suggest that you also post your questions relating to Oracle NoSQL Database to the OTN forum: https://forums.oracle.com/forums/forum.jspa?forumID=1388.  We monitor the forums regularly...

Happy Holidays.

Ashok Joshi
Senior Director, Oracle NoSQL Database development