SQL> select height, blocks, name, lf_rows, del_lf_rows from index_stats where height > 3 ;

   HEIGHT    BLOCKS NAME                             LF_ROWS DEL_LF_ROWS
--------- --------- ------------------------------ --------- -----------
        4     43500 SECTORAL_IDX_1                   6818494           0

SQL> alter index SECTORAL_IDX_1 rebuild ;

Index altered.

SQL> analyze index SECTORAL_IDX_1 validate structure ;

Index analyzed.

SQL> select height, blocks, name, lf_rows, del_lf_rows from index_stats ;

   HEIGHT    BLOCKS NAME                             LF_ROWS DEL_LF_ROWS
--------- --------- ------------------------------ --------- -----------
        4     43500 SECTORAL_IDX_1                   6818494           0