Whichever method you choose, the key word to remember here is "test." Make sure you and the application support teams do lots of it. There were many, many changes made to the Oracle kernel between version 6 and 9.2 that are bound to affect your applications – some will improve performance but others may require some work or code changes. You may also want to open a TAR with Oracle Support and ask for their expertise on how best to proceed with this upgrade.
Dig Deeper on Oracle database installation, upgrades and patches
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