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I'd like to know something, I uninstalled Oracle OBIEE, I should uninstall Oracle Database 11g too? because when I install it for the second time, i got error related to instance .......
If you uninstalled cleanly following the documentation you don't have to uninstall your database.
If you uninstalled with a personal and custom process (like deleting the root folder of OBIEE) you must clean up things in the DB ...