SQL> create table test_lower (s varchar2( 4000 ));

Table created.

SQL> create index test_lower_i on test_lower (lower(s));

Index created.

SQL> insert into test_lower values('TEST');

 1  row created.

SQL> commit;

Commit complete.

SQL> select cols,intcols from tab$ where obj#=(select object_id from dba_objects where object_name='TEST_LOWER' and object_type='TABLE');

      COLS    INTCOLS
---------- ----------
          1            2 

SQL> select col#,segcol#,intcol#,name from col$ where obj#=(select object_id from dba_objects where object_name='TEST_LOWER' and object_type='TABLE');

      COL#    SEGCOL#    INTCOL# NAME
---------- ---------- ---------- ------------------------------
          1            1            1  S
          0            0            2  SYS_NC00002$

SQL> select dbms_rowid.rowid_relative_fno(rowid), dbms_rowid.rowid_block_number(rowid) from test_lower;

DBMS_ROWID.ROWID_RELATIVE_FNO(ROWID) DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID)
------------------------------------ ------------------------------------
                                    1                                  43634 

SQL> alter system dump datafile  1  block  43634 ;

System altered.

SQL>

Start dump data blocks tsn:  0  file#:  1  minblk  43634  maxblk  43634 
buffer tsn:  0  rdba: 0x0040aa72 ( 1 / 43634 )
scn: 0x0000.004959f6 seq: 0x01 flg: 0x02 tail: 0x59f60601
frmt: 0x02 chkval: 0x0000 type: 0x06=trans data
Block header dump:  0x0040aa72
 Object id on Block? Y
 seg/obj: 0x77b9  csc: 0x00.4959f5  itc:  2   flg: O  typ:  1  - DATA
     fsl:  0   fnx: 0x0 ver: 0x01
 
 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0009. 000 . 00001698   0x02400514.013f.4b  --U-    1  fsc 0x0000.004959f6
0x02   0x0000. 000 . 00000000   0x00000000. 0000 . 00   ----    0  fsc 0x0000.00000000
 
data_block_dump,data header at 0x33f685c
===============
tsiz: 0x1fa0
hsiz: 0x14
pbl: 0x033f685c
bdba: 0x0040aa72
      76543210 
flag=--------
ntab= 1 
nrow= 1 
frre=- 1 
fsbo=0x14
fseo=0x1f98
avsp=0x1f83
tosp=0x1f83
0xe:pti[ 0 ]	nrow= 1 	offs= 0 
0x12:pri[ 0 ]	offs=0x1f98
block_row_dump:
tab  0 , row  0 , @0x1f98
tl:  8  fb: --H-FL-- lb: 0x1  cc: 1
col   0 : [  4 ]   54   45   53   54 
end_of_block_dump
End dump data blocks tsn:  0  file#:  1  minblk  43634  maxblk  43634