Oracle恢复实验（二）：数据文件user01.dbf损坏，打开数据库情况下进行恢复。

环境：Oracle10g、Red Hat 4，Oracle运行在归档模式。

场景：数据文件user01.dbf损坏，打开数据库情况下进行恢复。

具体步骤：

1、删除user01.dbf文件模拟数据文件损坏，关闭数据库，尝试打开。

!rm -f /home/oracle/oracle/product/oradata/orcl、users01.dbf

SQL> shutdown abort

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 130023424 bytes

Fixed Size 1218100 bytes

Variable Size 62917068 bytes

Database Buffers 62914560 bytes

Redo Buffers 2973696 bytes

Database mounted.

ORA-01157: cannot identify/lock data file 4 - see DBWR trace file

ORA-01110: data file 4: '/home/oracle/oracle/product/oradata/orcl/users01.dbf'

可以看到：数据文件4找不到，无法打开数据库，数据库启动到Mount状态

2、将损坏数据文件脱机

SQL> alter database datafile 4 offline;

Database altered.

3、打开数据库

SQL> alter database open;

Database altered.

脱机后，数据库可以正常打开。

4、复制数据文件，尝试将数据文件联机

SQL> !cp /disk2/bak/users01.dbf /home/oracle/oracle/product/oradata/orcl

SQL> alter database datafile 4 online;

alter database datafile 4 online

*

ERROR at line 1:

ORA-01113: file 4 needs media recovery

ORA-01110: data file 4: '/home/oracle/oracle/product/oradata/orcl/users01.dbf'

此时Oracle会提示需要介质恢复

5、介质恢复

recover tablespace users;

6、将表空间联机

SQL> select name,status from v$datafile;

NAME STATUS

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

/home/oracle/oracle/product/oradata/orcl/system01.dbf SYSTEM

/home/oracle/oracle/product/oradata/orcl/undotbs01.dbf ONLINE

/home/oracle/oracle/product/oradata/orcl/sysaux01.dbf ONLINE

/home/oracle/oracle/product/oradata/orcl/users01.dbf OFFLINE

SQL> alter database datafile 4 online;

Database altered.

7、检查数据

SQL> select count(*) from scott.recover_test;

COUNT(*)

----------

448