Here is Oracle's Learning Library on the 12c Database
Note also : Tom Kyte on Oracle 12c
Additional Resources :
1. Presentation on the 12c Architecture
2. Presentation on the Multitenant (CDB and PDBs) Architecture
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Note also : Tom Kyte on Oracle 12c
Additional Resources :
1. Presentation on the 12c Architecture
2. Presentation on the Multitenant (CDB and PDBs) Architecture
.
.
.