What is a pluggable database Oracle

A pluggable database (PDB) is a portable collection of schemas, schema objects, and nonschema objects that appears to an Oracle Net client as a non-CDB. PDBs can be plugged into to CDBs. A CDB can contain multiple PDBs. Each PDB appears on the network as a separate database.

What is difference between container database and pluggable database?

Whereas the system container contains the CDB root and allthe PDBs within the CDB, an application container includes only the PDBs plugged into the application root. An application root belongs to the CDB root and no other container. A PDB contains the data and code required for a specific set of features (see “PDBs”).

What is pluggable database in 12c?

Pluggable databases are the new kid on the block, one of the newfangled features of 12c. According to the documentation, a pluggable database (PDB) is a portable collection of schemas, schema objects, and non-schema objects that appear to an Oracle Net client as a separate database.

What are the benefits of pluggable database?

Database consolidation. …
Cost reduction. …
Easier management and monitoring of the physical database.
Secure separation of administrative duties.
Separation of data and code.
Easier and more rapid movement of data and code.
Ease of performance tuning.

What is a CDB in Oracle?

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

How do I know if my database is pluggable?

You can query the CDB column in the V$DATABASE view to see if a database is CDB. If the current database is CDB, the column value will be YES, otherwise the CDB column value will be NO. Copyright (c) 1982, 2016, Oracle. All rights reserved.

How do you know if its CDB or PDB?

Starting Oracle 12.2 sys_context(‘USERENV’,’DB_NAME’) will show the name of the Database in CDB$ROOT and the name of the PDB inside the PDB.

What are the advantages of using CDB and PDB?

Benefits of the Multitenant Architecture : The Oracle Multitenant option enables you to consolidate data and code without altering existing schemas or applications. The PDB/non-CDB compatibility guarantee means that a PDB behaves the same as a non-CDB as seen from a client connecting with Oracle Net.

How do I connect to a pluggable database?

Create a database service with PDB property using the SRVCTL utility.
Create an entry in the tnsnames. ora file for the service created.
Start the service.
Connect to the database using the service with the pdb property, created in step a.

How many pluggable databases are there in Oracle 12c?

Oracle Multitenant offers the ability to have up to 252 PDBs per multitenant container database. The multitenant architecture with one user-created pluggable database (single tenant) is available in all editions without the multitenant option.

Article first time published on

How do I get a PDB?

Create a PDB by using the seed as a template. Use the create_pdb_from_seed clause to create a PDB by using the seed in the multitenant container database (CDB) as a template. …
Create a PDB by cloning an existing PDB or non-CDB. …
Create a PDB by plugging an unplugged PDB or a non-CDB into a CDB.

How does SQL Developer connect to PDB database?

In SQL Developer, the DBA Navigator enables you to perform full administration of container databases and pluggable databases. Select View > DBA. On the DBA tab, right-click Connections and select Add Connection. In the Select Connection dialog box, select sys and click OK.

What is PDB seed in Oracle 12c?

A Seed PDB is actually the PDB$SEED which is an oracle supplied template that the CDB can use to create new PDBs. You can use the CREATE PLUGGABLE DATABASE statement to create a PDB by copying the files from PDB$SEED, which is a template for creating PDBs. …

What is Oracle multitenant?

Oracle Multitenant is a new option for Oracle Database 12c Enterprise Edition that helps customers reduce IT costs by simplifying consolidation, provisioning, upgrades, and more. It is supported by a new architecture that allows a container database to hold many pluggable databases.

What are two most important components in the Oracle 12c multitenant architecture?

CDB Instance. Multitentant Container Database (CDB) instances are similar to instances in a non-CDB (pre-12c) database. …
Root Container. ROOT container is the very first container that’s created with a container database. …
Seed Container. …
Pluggable Database (PDB)

What happens by default after restarting a CDB?

SAVE STATE command does not error when run against a container in MOUNTED mode, but nothing is recorded, as this is the default state after a CDB restart. Like other examples of the ALTER PLUGGABLE DATABASE command, PDBs can be identified individually, as a comma separated list, using the ALL or ALL EXCEPT keywords.

How do I find my PDB size?

Check the Size of Oracle Database and PDB databases select sum(bytes)/1024/1024 size_in_mb from dba_segments; Check the size of User or Schema in Oracle. select owner, sum(bytes)/1024/1024 Size_MB from dba_segments group by owner; Check free space and used space in database.

How do I connect directly to PDB?

Create a database service with PDB property using the SRVCTL utility.
Create an entry in the tnsnames. ora file for the service created.
Start the service.
Connect to the database using the service with the pdb property, created in step a.

How do I create a PDB service?

Create a service. SQL> exec dbms_service. …
Start the service. SQL> exec dbms_service. …
Save current state of this container. SQL> alter pluggable database orclpdb save state; …
Check services of the container. Let’s see current services of the container after adding a service to it. …
Node 1. …
Node 2.

How do I add a user to a pluggable database?

To create a common user, you must be connected to the root. You can optionally specify CONTAINER = ALL , which is the default when you are connected to the root. To create a local user, you must be connected to a PDB. You can optionally specify CONTAINER = CURRENT , which is the default when you are connected to a PDB.

What is a non-CDB database?

Basically: A non-CDB stores all metadata (system ones and user ones) in the same dictionary. A CDB stores user metadata only in the database dictionary, which have links to a common dictionary that contains the system metadata. The common container is called ‘root’ and the database is called ‘pluggable database’.

What is meant by multi-tenant architecture?

Multi-tenancy is an architecture in which a single instance of a software application serves multiple customers. Each customer is called a tenant. … In this way, a software application in a multi-tenant architecture can share a dedicated instance of configurations, data, user management and other properties.

What is multitenant database?

Multi-Tenant – Multi-tenancy means that a single instance of the software and its supporting infrastructure serves multiple customers. Each customer shares the software application and also shares a single database. Each tenant’s data is isolated and remains invisible to other tenants.

What is difference between 11g and 12c in Oracle?

Oracle 12c is just upgraded version of the Oracle 11g with some new features like cloud support and pluggable database, kind of like master slave architecture. With the Oracle 12 c, you can plug your database to cloud anytime. It has multiple new features like JSON support, multitenant architecture and etc.

What is Oracle_pdb?

No, the value of ORACLE_PDB is used for the PDB name that you specify in the CREATE PLUGGABLE DATABASE statement. That in itself creates a service with equal name, which happens since the days of 10g and has nothing to do with PDBs. Oracle automatically creates a service name corresponding to the database name.

What is Cdbroot?

The CDB root is a system-supplied container that stores common users, which are users that can connect to multiple containers, and system-supplied metadata and data. The source code for system-supplied PL/SQL packages is stored in the CDB root.

What is PDB seed in Oracle 19c?

Part III Creating and Removing PDBs and Application Containers. 5 Overview of PDB Creation. Techniques for Creating a PDB. Current Container and PDB Creation. Options for Creating a PDB from a Non-CDB.

Is Oracle a cloud multitenant?

Oracle very frequently compares its Oracle Cloud to AWS and to GCP and Azure. However, a point they leave out is that they do not offer multitenancy, and their clouds are not tr cloud — but instead are closer to data centers in terms of how they function.