教你如何来恢复一个丢失的数据文件 

[oracle@jumper eygle]$ sqlplus "/ as sysdba" 

SQL*Plus: Release 9.2.0.4.0 - Production on Sun Aug 20 01:22:50 2006 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved. 

Connected to an idle instance. 



SQL> startup mount 

ORACLE instance started. 



Total System Global Area  252777592 bytes 

Fixed Size                   451704 bytes 

Variable Size             134217728 bytes 

Database Buffers          117440512 bytes 

Redo Buffers                 667648 bytes 

Database mounted. 





SQL> alter database open; 

alter database open 

* 

ERROR at line 1: 

ORA-01157: cannot identify/lock data file 3 - see DBWR trace file 

ORA-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.dbf 



SQL> alter database open; 

alter database open 

* 

ERROR at line 1: 

ORA-01113: file 3 needs media recovery 

ORA-01110: data file 3: "/opt/oracle/oradata/eygle/eygle02.dbf" 





SQL> recover datafile 3; 

Media recovery complete. 

SQL> alter database open; 

Database altered. 

SQL>