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Oracle12c come with a new multitenant architecture that makes it easy to deploy and manage database clouds, and big data, now you can deploy public and private cloud.
I don't see it happening in major financial production systems. The reason is that with multi-tenent one single SGA (buffer cache, shared pool etc) is shared by multiple databases. so a bad query from one database or a full table scan from one database will cause flush of good data from the caches thus affecting other databases.
Ask yourself do you want to run your core banking on a system where a query other than your application will come and hamper your performance ??
I see it being deployed more for consolidation of testing/UAT systems.
Yes. Oracle Multitenant Container and Pluggable databases is new feature in Oracle 12c that can be leveraged to consolidate and implement in the Cloud.
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