Why does JBoss ON 3.2 and above need two databases?

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Issue

Why does JBoss ON 3.2 need two databases?
Why do we need two databases in JBoss ON 3.2?
What content is stored in the Oracle DB and what in the Cassandra NoSQL DB?
Does JBoss ON 3.3 require both relational and NoSQL databases?

Environment

Red Hat JBoss Operations Network (JON) 3.2, 3.3
JBoss ON is updated from 3.1.2 to 3.2.0 or above

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