What are the major changes in architecture for 12c?

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From 12c Onwards, the instance is shared with multiple databases.These multiple databases are self-contained and pluggable from one database to another database. This is very useful methodology where database consolidation.In short a
single SGA and background process will be shared to multiple databases, the databases can be created on the fly and drop or attach and detach from one server to another server. 

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