ALTER INDEX RPT_IDX3 DISABLE;

SQL Error: ORA-14415: index in partially dropped state, submit DROP INDEX
14415. 00000 -  "index in partially dropped state, submit DROP INDEX"
*Cause:    An attempt was made to access an index in a partially dropped
           state.
*Action:   Submit the DROP INDEX <index> statement to drop the index.

select * from dba_indexes        where index_name in ('RPT_IDX3') order by index_name;
select * from dba_ind_statistics where index_name in ('RPT_IDX3') order by index_name;
select * from dba_ind_columns    where index_name in ('RPT_IDX3') order by index_name;