教你如何来恢复一个丢失的数据文件

昨天Kamus问到一个问题，如果拥有一个冷备份，但是缺失了其中的一个数据文件，但是存在所有的归档，应该如何恢复数据文件。

动手试一下，大概就是如下步骤:

代码:

[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>

（T114）