oracle migration export and import

oracle migration export and import 할때..

Minimum Version of the database that can be directly upgraded to Oracle 10g Release 2     8.1.7.4            -> 10.2.X.X.X     9.0.1.4 or 9.0.1.5 -> 10.2.X.X.X     9.2.0.4 or higher  -> 10.2.X.X.X    10.1.0.2 or higher  -> 10.2.X.X.X + The following database version will require an indirect upgrade path.     7.3.3 (or lower) -> 7.3.4 -> 8.1.7 -> 8.1.7.4 -> 10.2.X.X.X     7.3.4 -> 8.1.7 -> 8.1.7.4 -> 10.2.X.X.X     8.0.n -> 8.1.7 -> 8.1.7.4 -> 10.2.X.X.X     8.1.n -> 8.1.7 -> 8.1.7.4 -> 10.2.X.X.X