SQL> alter tablespace users  begin backup;

Tablespace altered.

SQL> shutdown abort;
ORACLE instance shut down.

SQL> startup;
ORACLE instance started.

Total System Global Area  440401920 bytes
Fixed Size                  2021408 bytes
Variable Size             130025440 bytes
Database Buffers          306184192 bytes
Redo Buffers                2170880 bytes
Database mounted.
ORA-01113: file 4 needs media recovery
ORA-01110: data file 4: '/u01/app/oracle/oradata/XUHM/users01.dbf'

SQL> select * from v$backup;

     FILE# STATUS                CHANGE# TIME
---------- ------------------ ---------- ---------
         1 NOT ACTIVE                  0
         2 NOT ACTIVE                  0
         3 NOT ACTIVE                  0
         4 ACTIVE                 633476 16-OCT-12
         5 NOT ACTIVE                  0

SQL> alter tablespace users  end backup;

Tablespace altered.

SQL> select * from v$backup;

     FILE# STATUS                CHANGE# TIME
---------- ------------------ ---------- ---------
         1 NOT ACTIVE                  0
         2 NOT ACTIVE                  0
         3 NOT ACTIVE                  0
         4 NOT ACTIVE             633476 16-OCT-12
         5 NOT ACTIVE                  0

SQL> alter database open;

Database altered.