12c Pluggable Database feature capability

12c Pluggable Database feature capability

* You can have many Pluggable Databases (PDBs) inside a single container database (CDB)
* PDB is backwards compatible with an ordinary pre-12.1 database;
* PDB is transparent to applications * you don’t change the client code or your database objects
* Each instance in a RAC opens CDB as a whole (so the CDB and all the PDBs in it are at the same Oracle Database version)
* A session sees only the single PDB it connects to
* You can unplug a PDB from one CDB and plug it into another CDB
* You can clone a PDB, both within the same CDB or from one CDB to another one
* Resource Manager is extended with new PDB capabilities
* The operations on PDBs as entities (creating, unplugging, plugging in, cloning, dropping, and setting the Open_Mode) are implemented as SQL statements
* CDB’s administrator executes these operations when connected to its so-called root
* Pluggable Databases functionality is fully interoperable with all the database options
* All PDBs can be backed up at once, but recovered separately