我贴上我的测试步骤吧，想必大家也看的懂，注释就不加了吧？

db_block_size=4k

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 1024m;

Database altered.

SQL> drop table tt2;

Table dropped.

SQL> select sum(bytes)/1024/1024 from dba_free_space where tablespace_name='DATA';

SUM(BYTES)/1024/1024

--------------------

1022

SQL> select max(block_id),min(block_id) from dba_extents where file_id=2;

MAX(BLOCK_ID) MIN(BLOCK_ID)

------------- -------------

SQL> create table tt1 (id number) tablespace data storage(initial 100m next 100m minextents 4);

Table created.

SQL> select max(block_id),min(block_id) from dba_extents where file_id=2;

MAX(BLOCK_ID) MIN(BLOCK_ID)

------------- -------------

101905            17

SQL> create table tt2 (id number) tablespace data storage(initial 100m next 100m minextents 4);

Table created.

SQL> select max(block_id),min(block_id) from dba_extents where file_id=2;

MAX(BLOCK_ID) MIN(BLOCK_ID)

------------- -------------

204305            17

SQL> create table tt3 (id number) tablespace data storage(initial 10m next 10m minextents 6);

Table created.

SQL> select max(block_id),min(block_id) from dba_extents where file_id=2;

MAX(BLOCK_ID) MIN(BLOCK_ID)

------------- -------------

219665            17

SQL> drop table tt1;

Table dropped.

SQL> select sum(bytes)/1048576 from dba_free_space where tablespace_name='DATA';

SUM(BYTES)/1048576

------------------

562

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 600m;

alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 600m

*

ERROR at line 1:

ORA-03297: file contains used data beyond requested RESIZE value

SQL> select (max(block_id)-min(block_id))*4/1024 from dba_extents where file_id=2;

(MAX(BLOCK_ID)-MIN(BLOCK_ID))*4/1024

------------------------------------

458

SQL> select min(block_id)*4/1024 from dba_extents where file_id=2;

MIN(BLOCK_ID)*4/1024

--------------------

400.066406

SQL> select max(block_id)*4/1024 from dba_extents where file_id=2;

MAX(BLOCK_ID)*4/1024

--------------------

858.066406

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 860m;

alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 860m

*

ERROR at line 1:

ORA-03297: file contains used data beyond requested RESIZE value

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 864m;

Database altered.

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 861m;

Database altered.

SQL> alter table tt3 move tablespace data;

Table altered.

SQL> select max(block_id)*4/1024 from dba_extents where file_id=2;

MAX(BLOCK_ID)*4/1024

--------------------

798.066406

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 802m;

Database altered.

SQL> alter table tt2 move tablespace data;

alter table tt2 move tablespace data

*

ERROR at line 1:

ORA-01659: unable to allocate MINEXTENTS beyond 170 in tablespace DATA

SQL> alter table tt3 move tablespace system;

Table altered.

SQL> alter table tt2 move tablespace data;

Table altered.

SQL> select max(block_id)*4/1024 from dba_extents where file_id=2;

MAX(BLOCK_ID)*4/1024

--------------------

398.066406

SQL> alter table tt3 move tablespace data;

Table altered.

SQL> select max(block_id)*4/1024 from dba_extents where file_id=2;

MAX(BLOCK_ID)*4/1024

--------------------

458.066406

SQL> alter database datafile 'd:\oracle\oradata\tt\data.dbf' resize 462m;

Database altered.