Pluggable database

We are now able to have multiple databases sharing a single instance and Oracle binaries. Each of the databases will be configurable to a degree and will allow some parameters to be set specifically for themselves (due that they will share the same initialization parameter file) and what is better, each database will be completely isolated from each other without either knowing that the other exists.

A CDB is a single physical database that contains a root container with the main Oracle data dictionary and at least one PDB with specific application data. A PDB is a portable container with its own data dictionary, including metadata and internal links to the system-supplied objects in the root container, and this PDB will appear to an Oracle Net client as a traditional Oracle database. The CDB also contains a PDB called SEED, which is used as a template when an empty PDB needs to be created. The following figure shows an example of a CDB with five PDBs:

When creating a database...