If youwant to upgrade a single instance, youcan use the Database Upgrade Assistant,
which can be started from the Oracle Universal Installer. As of Oracle Database 11g,
youcan upgrade from the free version of Oracle, Oracle XE, to a single instance with
the Database Upgrade Assistant.
One of the longstanding problems with upgrades has been the requirement to bring
down the database, upgrade the database software, and then restart the database.
This necessary downtime can impinge on your operational requirements. If you are
using a Real Application Clusters implementation since Oracle Database 10g, you
can perform a rolling upgrade. A rolling upgrade allows you to bring down some of
the nodes of the cluster, upgrade their software, and then bring them back online as
part of the cluster. You can then repeat this procedure with the other nodes. The end
result is that you can achieve a complete upgrade of your Oracle database software
without having to bring down the database.
Creating a Database
As we noted in Chapter 2, Oracle might be installed for a variety of workloads.
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