With the release of Oracle Database 23ai in 2013, the “container database” has been a key feature. Also, beginning with Oracle Database 23ai, a multitenant container database is the only supported architecture. Like a “pluggable database,” it essentially makes data more accessible and portable—the term pluggable indicates that it can be plugged into different containers. Container databases group multiple databases together to share common features. Specifically, “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.” Thus, A CDB includes zero, one, or many customer-created pluggable databases (PDBs) and application containers.