如果你目前擁有一個冷備份，但是缺少了其中的一個數據文件，但你目前存在所有的歸檔，假如你要恢復數據文件，可以參考以下的示例：

[oracle@jumper eygle]$ sqlplus '/ as sysdba'SQL*Plus: Release 9.2.0.4.0 - Production on Sun Aug 20 01:22:50 2006Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.Connected to an idle instance.SQL> startup mountORACLE instance started.Total System Global Area 252777592 bytesFixed Size 451704 bytesVariable Size 134217728 bytesDatabase Buffers117440512 bytesRedo Buffers 667648 bytesDatabase mounted.SQL> alter database open;alter database open*ERROR at line 1:ORA-01157: cannot identify/lock data file 3 - see DBWR trace fileORA-01110: data file 3: '/opt/oracle/oradata/eygle/eygle02.dbf'SQL> alter database create datafile 3 as '/opt/oracle/oradata/eygle/eygle02.dbf';Database altered.SQL> select name from v$datafile;NAME-------------------------------------------------------/opt/oracle/oradata/eygle/system01.dbf/opt/oracle/oradata/eygle/undotbs01.dbf/opt/oracle/oradata/eygle/eygle02.dbf/opt/oracle/oradata/eygle/eygle01.dbfSQL> alter database open;alter database open*ERROR at line 1:ORA-01113: file 3 needs media recoveryORA-01110: data file 3: '/opt/oracle/oradata/eygle/eygle02.dbf'SQL> recover datafile 3;Media recovery complete.SQL> alter database open;Database altered.SQL>