SQL> truncate table rate;

Table truncated.

SQL> insert into rate values('a',1);

1 row created.

SQL> insert into rate values('b',2);

1 row created.

SQL> insert into rate values('c',3);

1 row created.

SQL> commit;

Commit complete.

SQL> select dbms_rowid.rowid_block_number(rowid),rate from rate order by rate;

DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID)       RATE
------------------------------------ ----------
                                  50          1
                                  51          2
                                  52          3

SQL> select rowid,rate from rate order by rate;

ROWID                    RATE
------------------ ----------
AAAD9dAAGAAAAAyAAA          1
AAAD9dAAGAAAAAzAAA          2
AAAD9dAAGAAAAA0AAA          3

SQL> select object_id,object_name,object_type from user_objects where object_name='IDX_RATE'
  2  /

 OBJECT_ID OBJECT_NAME                              OBJECT_TYPE
---------- ---------------------------------------- -------------------
     16211 IDX_RATE                                 INDEX

SQL> delete from rate where rate=2;

1 row deleted.

SQL> commit;

Commit complete.

SQL> alter table rate shrink space;

Table altered.

SQL> select dbms_rowid.rowid_block_number(rowid),rate from rate order by rate;

DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID)       RATE
------------------------------------ ----------
                                  38          1
                                  37          3

SQL> select rowid,rate from rate order by rate;

ROWID                    RATE
------------------ ----------
AAAD9dAAGAAAAAmAAA          1
AAAD9dAAGAAAAAlAAA          3

---可以发现，执行shrink之后，数据所在的block和rowid都发生了变化，在shrink前后，对相应的索引数据块做dump，查看索引中数据是否也相应的被更新，
SQL> alter session set events 'immediate trace name treedump level 16211';

Session altered.

SQL> select DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(25165925),
  2  DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(25165925)
  3  from dual;

DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(25165925) DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(25165925)
---------------------------------------------- -----------------------------------------------
                                             6                                             101

SQL> alter system dump datafile 6 block 101;

System altered.

SQL> alter session set events 'immediate trace name treedump level 16211';

Session altered.

SQL> select DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(25165925),
  2  DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(25165925)
  3  from dual;

DBMS_UTILITY.DATA_BLOCK_ADDRESS_FILE(25165925) DBMS_UTILITY.DATA_BLOCK_ADDRESS_BLOCK(25165925)
---------------------------------------------- -----------------------------------------------
                                             6                                             101

SQL> alter system dump datafile 6 block 101;

System altered.

row#0[1876] flag: ------, lock: 2, len=12           row#0[1828] flag: ------, lock: 2, len=12
col 0; len 2; (2):  c1 02                           col 0; len 2; (2):  c1 02               
col 1; len 6; (6):  01 80 00 32 00 00               col 1; len 6; (6):  01 80 00 26 00 00   
row#1[1864] flag: ------, lock: 2, len=12           row#1[1876] flag: ---D--, lock: 2, len=12
col 0; len 2; (2):  c1 03                           col 0; len 2; (2):  c1 02               
col 1; len 6; (6):  01 80 00 33 00 00               col 1; len 6; (6):  01 80 00 32 00 00   
row#2[1852] flag: ------, lock: 2, len=12           row#2[1840] flag: ------, lock: 0, len=12
col 0; len 2; (2):  c1 04                           col 0; len 2; (2):  c1 04               
col 1; len 6; (6):  01 80 00 34 00 00               col 1; len 6; (6):  01 80 00 25 00 00   
----- end of leaf block dump -----                  ----- end of leaf block dump -----      

可以很清晰的看出，索引块里的数据发生了变化，这说明在shrink的同时，索引数据块里的数据也将被同步更新。