Newb Active-Passive / Active-Active Single Instance Question

I just want to make sure I understand this correctly...

If you are running only one database (one instance?), and are clustered,
then you must be running in an "active / passive" configuration. There is no
way that both nodes can "share" the single database instance across both
nodes for improved performance (ala Oracle Parallel server or Oracle RAC).

With mulit-instance, where you would have two databases, you could run one
on Node A and one on Node B. Essentially, the databases are separate. But
if one node fails, the other node could operate both instances (with reduced
performance).

Are these statements correct?

Thanks.

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