Performing Oracle Advanced Recovery - OCP: Oracle Database 12c Administrator Certified Professional - page 329

Once you have configured OSB, you can then proceed to schedule OSB backups of both
Oracle Database and the operating system file system. You will need to install the OSB client
on any host that you wish to back up with OSB before you can use OSB on that host.
Oracle Database 12 c Multitenant
Architecture and RMAN
Oracle Database 12 c introduces a complete new architecture called Oracle Multitenant.
We will cover the basics of Oracle Multitenant in Chapter 12 of this topic. However, in this
chapter, it seemed to make sense to include RMAN and backup and recovery operations
related to Oracle Multitenant. We also include coverage on using Data Pump with the mult-
itenant architecture in this chapter.
Architecture Overview
Chapter 12 provides a complete overview of Oracle Multitenant, but we felt that a quick
overview was important since we will be dealing with some concepts of Oracle Multitenant
in this section.
With Oracle Multitenant there are two principal concepts to understand: CDB and PDB.
Let's quickly take a look at each of these.
Oracle Multitenant CDB
In previous versions of Oracle, a given database instance would be associated with one, and
only one, Oracle database. Oracle Multitenant has turned that principle on its head. Now,
the Oracle database instance can service more than one Oracle database.
This new architecture contains three layers, two of which are somewhat new to you:
■ The container database (CDB)
■ The pluggable database (PDB)
■ The underlying schemas in the PDB
The CDB is the top layer. Think of it as the root of the new database architecture. In a
way, all of the other databases, the PDBs, are contained in a tree structure that starts under-
neath the owning CDB.
The CDB contains tablespaces and schemas, and it manages the control files and online
redo logs. The CDB is purely administrative in nature, so you should never create objects
in the CDB. Connecting to a CDB is like connecting to a non-multitenant database. You
simply set the ORACLE_SID to the name of the CDB and then you can connect via SQL*Plus.
You can also use Oracle Net service naming to connect to the CDB just as you always have.
The logging mode of the entire database is determined at the CDB level. As with a non-
multitenant database, the CDB can be in ARCHIVELOG mode or NOARCHIVELOG
mode. The functionality of the multitenant database in both modes is unchanged.