Question: I am migrating a database into an
Oracle RAC cluster, and I need to decide whether to add the system
as a new schema within an existing instance or create a new
instance. How do I decide whether to create a new instance versus
creating a new schema?
Answer: Essentially, the decision of
creating a new instance vs. a new schema is a question of sharing
computing resources.
If the system never communicate with each other, I would not put
them in the same instance . . .
With a separate instance, one system cannot clobber another, but
you need to have enough RAM to support the extra SGA regions on each
RAC node.
In a nutshell, if you have the extra RAM, a new instance give the
DBA more granular control over the system performance and
manageability
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