In this chapter, you will see
descriptions of these methods along with guidelines for their use.
If you have not used a version of Oracle prior to Oracle Database 11g, you can skip this chapter
for now. However, you will likely need to refer to it when you upgrade from Oracle Database 11g to
a later version or when you migrate data from a different database into your database.
Prior to beginning the upgrade, you should read the Oracle Database 11g Installation Guide for
your operating system. A successful installation is dependent on a properly configured environment??”
including operating system patch levels and system parameter settings. Plan to get the installation
and upgrade right the first time rather than attempting to restart a partially successful installation.
Configure the system to support both the installation of the Oracle software and the creation of a
usable starter database.
This chapter assumes that your installation of the Oracle Database 11g software (see Chapter
1 and the appendix titled ???Installation and Configuration???) completed successfully and that you
have an Oracle database that uses an earlier version of the Oracle software on the same server.
Note that whether you are installing from scratch or upgrading a previous version of the Oracle
Database, there are distinct advantages to installing the Oracle Database 11g software and
creating the database in separate steps. When installing from scratch, you have greater control
over initialization parameters, database file locations, memory allocation, and so forth when
you create the database in a separate step; when upgrading from a previous release, installing
the software first provides you with the Oracle Pre-Upgrade Information Tool that you use against
the existing database to alert you to any potential compatibility problems when you upgrade to
Oracle Database 11g.
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