There are a variety of ways to upgrade an 8i database to 9i, including using the DBUA (Database Upgrade Assistant), performing the upgrade manually via scripts, using the export/import utilities and, finally, the CTAS (create table as select) method. Each method is described in detail in the Oracle9i Release 2 (9.2) Database Migration Guide found here.
Prior to performing an upgrade, you will first want to install Oracle9i in a separate ORACLE_HOME from where Oracle8i is currently installed. After this is completed, you can then migrate your database to Oracle9i with whatever method best suits your situation.
Dig Deeper on Oracle database installation, upgrades and patches
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