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i had an error earlier today when i was carrying out health check on my database. ora -20000 and i tried to rebuild online, but it didnt work, and it came up with a message about duplicity of the index file and i searched to locate if that was true, but i tried to solve the problem by searching for multiple index with the same name, but there wasnt.
Did you try to drop index and recreate index again?What is exact error message?