This article will be discussing a new feature of Oracle 12c Database, Oracle Multitenant Architecture, which enables an Oracle Database to act as multitenant Container Database (CDB). A CDB includes one or many pluggable databases (PDBs). One default PDB, the seed PDB, is provided by Oracle in every CDB. Users cannot make changes to the seed PDB, but user can create additional PDBs using this default PDB. A CDB can contain 253 PDBs.

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