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The multitenant architecture enables an Oracle database to function as a multitenant containerdatabase (CDB) that includes zero, one, or many customer-created pluggable databases (PDBs).

PDB is a portable collection of schemas, schema ob!ects, and nonschema ob!ects

container is either a PDB or the root container (also called the root ). The root is a collection ofschemas, schema ob!ects, and nonschema ob!ects to "hich all PDBs

#$ery %DB has the follo"ing containers&

• Exactly one root

The root stores Oracle-supplied metadata and common users. An example ofmetadata is the source code for Oracle-supplied PL/SQL packa es. A commonuser is a data!ase user kno"n in e#ery container . The root container isnamed CDB$ROOT .

• Exactly one seed PDB

The seed P$% is a system-supplied template that the &$% can use to create ne"P$%s. The seed P$% is named PDB$SEED . 'ou cannot add or modify o!(ectsin PDB$SEED .

• )ero or more user-created P$%s

A P$% is a user-created entity that contains the data and code re*uired for aspeci+c set of features. ,or example a P$% can support a speci+c applicationsuch as a human resources or sales application. o P$%s exist at creation of the&$%. 'ou add P$%s !ased on your !usiness re*uirements.

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7/21/2019 Oracle 12c Architecture

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Benefits of the 'ultitenant rchitecture for Database%onsolidationThe process of consolidating data from multiple databases into one database on one computer is

no"n as database consolidation . tarting in Oracle Database *+ c , the Oracle 'ultitenant optionenables you to consolidate data and code without altering existing schemas or applications .