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Is an index unusable during a rebuild or move?

Is an Oracle8i index unusable during a rebuild or an index move (non IOT)? I need availability 24x7 and would like to be able to access a table via an index that is being rebuilt.
While the index is being moved, it is unusable. You can specify the ONLINE option to make the index available during the move, ie.

ALTER INDEX my_index REBUILD new_tablespace ONLINE;

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