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OFA documentation is included in the Oracle installation guide.
Supporting Multiple Oracle Versions on a Machine
You can install and run multiple versions of Oracle on a single-server machine. All
Oracle products use a directory referred to by the environment or system variable
ORACLE_HOME to find the base directory for the software they will use. Because of
Creating a Database | 59
this, you can run multiple versions of Oracle software on the same server, each with
a different ORACLE_HOME variable defined. Whenever a piece of software accesses
a particular version of Oracle, the software simply uses the proper setting for the
ORACLE_HOME environment variable.
Oracle supports multiple ORACLE_HOME variables on Unix and Windows systems
by using different directories. The OFA provides clear and excellent standards
for this type of implementation.
Upgrading an Oracle Database
Oracle Database 10g added two additional features that apply to upgrading an existing
Oracle database: the Database Upgrade Assistant and support for rolling
upgrades.


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