Next, you must determine how you are going to perform the upgrade. Will you be creating a new Oracle 9.2 database, and then importing the 8i database schemas into it? Will you upgrade the database in place with either the DBUA (Database Upgrade Assistant) or manually? There are several options for performing and upgrade. Which one you choose will depend on how large the database is, and how long of an outage you can afford to take for...
The Oracle9i Database Migration Guide provides a very good step-by-step process for database migration. As well as providing very good technical details about the upgrade process itself, there is also good advice regarding any preparatory and post-migration tasks.
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