Can you rebuild the index or you have to drop it and recreate it? Because when you rebuild it, Oracle will use the old index to build the new one (does anyone know how?). My concern is that if the old index contains invalid rowid info, can you still use the index to rebuild a new one?
rebuild is like drop and recreate, in this case there is no difference between two because the index is unusable so in any case users cannot use it (I would guess recreate is a better way and save freespace)
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