#oracle
#database
#CDB
#DPB

#part_1
درباره CDBو PDB در Oracle
قسمت اول

A container is a collection of schemas, objects, and related structures in a multitenant container database (CDB). Within a CDB, each container has a unique ID and name.
A CDB includes zero, one, or many customer-created pluggable databases (PDBs) and application containers. A PDB is a portable collection of schemas, schema objects, and nonschema objects that appears to an Oracle Net client as a separate database. An application container is an optional, user-created CDB component that stores data and metadata for one or more application back ends. A CDB includes zero or more application containers.

A PDB is a user-created set of schemas, objects, and related structures that appears logically to a client application as a separate database.
Every PDB is owned by SYS, regardless of which user created the PDB. SYS is a common user in the CDB, which means that this user that has the same identity in the root and in every existing and future PDB within the CDB.

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