As you know, the architecture of the Oracle database in the 12c version has undergone many improvements, now we can talk about “Pluggable Database”, “Container” and “SEED”. For those who are already deep in these new concepts of “multitanent” they will already be aware that a database of type “CDB” may contain from zero to 253 “Pluggable Databases” including the “SEED”. A database that hosts all internal databases is called “CBD $ ROOT” and internal databases are called “Pluggable Database” or “PDB”, the “PDB $ SEED” is also a PDB, but the difference is that it can only be opened in read mode and is used as a template to create new PDB.

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