You should always backup your data first. There is no need to use export/import to do the upgrade; all you need to do is run the script u0801050.sql after you shutdown the database normal (or immediate), and restart the database. This could be a good time to use export/import to reorg your data, or change the block size of the database. Other then that, the upgrade is really easy. Remember to run catalog.sql and catproc.sql after the upgrade.
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