This section explains the difference between migrating, upgrading, and downgrading, and lists the Oracle database versions that can be migrated or upgraded.
What Is Migrating?
Migrating is the process of transforming an installed version of an Oracle database into a later version. For example, transforming an Oracle7 database to an Oracle8i database is migrating the database system.
What Is Upgrading?
Upgrading is the process of transforming an installed version of an Oracle database release into another release of the same version. For example, transforming an Oracle8 database Release 8.0.4 to Release 8.1.6 is upgrading the database system.
What Is Downgrading?
Downgrading is the process of transforming an installed version of an Oracle database from a later release back into an earlier release. For example, transforming an Oracle database from Release 8.1.6 back into Release 8.0.4 is downgrading, and transforming an Oracle database from Version8 back into Version7 is downgrading.
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