SQL> SELECT UI.clustering_factor,UI.num_rows,UI.index_type,UI.distinct_keys FROM USER_INDEXES UI WHERE UI.table_name = 'TAWB_AWB';

CLUSTERING_FACTOR   NUM_ROWS INDEX_TYPE                  DISTINCT_KEYS
----------------- ---------- --------------------------- -------------
            83609     187603 NORMAL                             187603

SQL> SELECT COUNT(DISTINCT DBMS_ROWID.rowid_block_number(ROWID)) BLOCK_NUM FROM TAWB_AWB A;

 BLOCK_NUM
----------
      5063

SQL> SELECT COUNT(*) FROM USER_INDEXES UI WHERE UI.table_name = 'TAWB_AWB';

  COUNT(*)
----------
         1

create table tmp as select * from mytab;
truncate table mytab;
insert into mytab select * from tmp order by <my index columns>;