Migrate DB 8i to 9i or DB 8i to 10g

The customer has DB 8i and he wants to migrate de DB to a new version.
Do you have any document of how migrate these versions?
What is the best practice to migrate?
Thanks

This is not an appropriate question for this forum. Your question is relating to upgrades rather than migration of 3rd party databases. I would post your question to the general database forum.
Donal

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