Upgrading a database in place??”via either the Database Upgrade Assistant or the manual
upgrade path??”is called a direct upgrade. Because a direct upgrade does not involve creating a
second database for the one being upgraded, it may complete faster and require less disk space
than an indirect upgrade.
NOTE
Direct upgrade of the database to version 11 is only supported if your
present database is using one of these releases of Oracle: 9.2.0.4,
10.1.0.2, or 10.2.0.1. If you are using any other release, you will
first have to upgrade the database to one of those releases or you
will need to use a different upgrade option. Oracle 8.0.6 is only
supported for some versions (generally 64-bit), so be sure to check
the online certification matrixes at Oracle??™s Metalink site or in the
Oracle Database Upgrade Guide.
NOTE
Plan your upgrades carefully; you may need to allow time for multiple
incremental upgrades (such as from 8.1.7 to 8.1.7.4 to 9.2.0.8) prior
to upgrading to Oracle Database 11g.
Choosing an Upgrade Method
As described in the previous section, two direct upgrade and two indirect upgrade paths are
available. In this section, you will see a more detailed description of the options, followed by
usage descriptions.
In general, the direct upgrade paths will perform the upgrade the fastest because they upgrade
the database in place. The other methods involve copying data, either to an Export dump file on
the file system, across a database link, or via a Data Pump export.
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