What is difference between CDB and PDB?

What is difference between CDB and PDB?

What is difference between CDB and PDB?

A CDB includes zero, one, or many customer-created pluggable databases (PDBs). A PDB is a portable collection of schemas, schema objects, and non-schema objects that appears to an Oracle Net client as a non-CDB . A common user is a database user known in every container .

What is a pluggable?

: capable of or suitable for being plugged.

What is container and pluggable database in 12c?

Pluggable databases are the new kid on the block, one of the newfangled features of 12c. One or more PDBs together are called a container database (CDB). They are completely transparent to the users and applications and are 100 percent backwardly compatible with pre-12c databases.

What is container DB and pluggable DB?

Container Database (CDB): This is the database that is created when that database supports Oracle’s multitenant option. It’s also called the ROOT container and is the CDB$ROOT within the data dictionary views of the CDB. Pluggable Database (PDB): These are the databases that are stored within the CDB.

What are the benefits of using pluggable database?

There are a number of benefits to pluggable databases:

  • 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.

How do I know if my database is PDB or CDB?

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 is the use of pluggable database?

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.

How do I create a pluggable database?

CREATE PLUGGABLE DATABASE

  1. 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.
  2. Create a PDB by cloning an existing PDB or non-CDB.
  3. Create a PDB by plugging an unplugged PDB or a non-CDB into a CDB.

How do I connect to a pluggable database?

Establishing a connection using user defined services involves the following steps:

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

How do I open a pluggable database?

You can view the open mode of a PDB by querying the OPEN_MODE column of the V$PDBS view. You can optionally use pdb_name to specify the name of the PDB whose open mode you want to change. This clause lets you change the open mode of a PDB to READ WRITE , READ ONLY , or MIGRATE .

How do I check my pluggable database status?

Check Startup, uptime and creation time of PDB database

  1. Check startup time of PDB database. col name for a8.
  2. Check uptime of PDB database. col name for a8.
  3. Check creation time and status of PDBS. select pdb_name,creation_time,status from dba_pdbs;
  4. Check size of PDBS.

What do you mean by pluggable database in Oracle?

Oracle created a “container database” concept with release 12c. A container database is the main “physical” database, and can contain “pluggable” databases; also called multi-tenant. Each pluggable database is logically whole, but can share memory, undo/redo/archived log/etc. This at least initially can lower resources required.

What makes a PDB a pluggable database?

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.

What’s the difference between container and pluggable databases?

A container database is the main “physical” database, and can contain “pluggable” databases; also called multi-tenant. Each pluggable database is logically whole, but can share memory, undo/redo/archived log/etc.

How to connect to a pluggable database in Oracle multitenant?

Once you’ve created pluggable databases in an Oracle Multitenant system, the next step is to connect applications to them so they can be used. Here’s how to do that. In my first article in this series on using the Oracle Multitenant architecture, I showed how to create a container database and the pluggable databases that run inside it.