Oracle 數據庫模擬數據文件損壞恢復

數據文件有時候因爲某種原因會導致損壞而導致無法啓動數據庫，那如何恢復呢？

下面是一次模擬實驗，如下

1. 首先創建一個表空間TEST，在創建一個表test在表空間test上

SQL> create tablespace test datafile '/u01/app/oracle/oradata/lhz/test01.dbf' size 10M;

SQL>  create table test as  select * from dba_objects;

Table created

SQL> alter table test move tablespace test;

Table altered

SQL> select count(*) from test;

 COUNT(*)

----------

    50881

2. 然後用vi編輯數據文件

[oracle@odb1 ~]$ vi /u01/app/oracle/oradata/lhz/test01.dbf

3.隨便輸入什麼字符，保存

4.關閉數據庫實例

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

5.啓動實例

SQL> startup

ORACLE instance started.

Total System Global Area  599785472 bytes

Fixed Size                  2098112 bytes

Variable Size             243272768 bytes

Database Buffers          348127232 bytes

Redo Buffers                6287360 bytes

Database mounted.

ORA-01157: cannot identify/lock data file 9 - see DBWR trace file

ORA-01110: data file 9: '/u01/app/oracle/oradata/lhz/test01.dbf'

看到報錯信息數據文件不能驗證或鎖定數據文件

6. 先將損壞數據文件offline，並打開數據庫實例

SQL> alter database datafile '/u01/app/oracle/oradata/lhz/test01.dbf' offline;

Database altered.

SQL> alter database open;

Database altered.

7. 添加相同的表空間test

SQL> alter database create datafile '/u01/app/oracle/oradata/lhz/test01.dbf';

Database altered.

SQL> recover datafile 9;

Media recovery complete.

SQL> alter database datafile 9 online;

Database altered.

8.驗證恢復結果：

SQL> select count(*) from andylhz.test;

 COUNT(*)

----------

    50881

恢復完成！