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Do you mean you want to upgrade your 8.0.5 database to 10g? If so, then direct upgrade is not supported from your base version. You first need to upgrade from 8.0.5 to 8.1.7, then to 10g. You can use DBCA.
If your database is small then export/import may be more appropriate as you can create all the tablespaces to be locally managed with assm features enabled. You should be able to export from 8i client and import using 10g client onto your 10g database.
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