oracle数据文件被删除没备份恢复



说明：数据库开规档，没备份，数据文件被删除的恢复

工具恢复文件：
http://blog.csdn.net/zhengwei125/article/details/50696799
没重启恢复： http://blog.csdn.net/zhengwei125/article/details/50696799
条件：

1.数据库开启归档

2.创建数据文件之后的所有归档日志都在

3.数据文件或表空间没有备份,数据文件异常丢失

步骤：

1.创建测试用的表空间：

SQL> create tablespace bbb datafile '/oradata/node1/bbb.dbf' size 100M;

Tablespace created.

SQL> conn zw/zw

Connected.

SQL> create table test1 (

id number(10)

)tablespace bbb;

SQL> insert into test1 values (1);

1 row created.

SQL> commit;

Commit complete.

SQL> select * from test1;

ID

----------

1

SQL> select name from v$datafile;

NAME

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

/oradata/node1/system01.dbf

/oradata/node1/sysaux01.dbf

/oradata/node1/undotbs01.dbf

/oradata/node1/users01.dbf

/oradata/node1/bbb.dbf

2.删除数据文件,模拟异常丢失

[oracle@node1 node1]$ mv bbb.dbf bbb.dbf.bak

[oracle@node1 node1]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Sun Jan 24 02:43:35 2016

Copyright (c) 1982, 2013, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL>

SQL> alter tablespace bbb read only;

alter tablespace bbb read only

*

ERROR at line 1:

ORA-01116: error in opening database file 5

ORA-01110: data file 5: '/oradata/node1/bbb.dbf'

ORA-27041: unable to open file

Linux-x86_64 Error: 2: No such file or directory

Additional information: 3

SQL> shutdown immediate

ORA-01116: error in opening database file 5

ORA-01110: data file 5: '/oradata/node1/bbb.dbf'

ORA-27041: unable to open file

Linux-x86_64 Error: 2: No such file or directory

Additional information: 3

SQL> select status from v$instance;

STATUS

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

OPEN

SQL> alter system switch logfile;

System altered.

SQL> /

SQL> shutdown abort;

ORACLE instance shut down.

3.把数据库启动到mount状态

SQL> startup mount;

ORACLE instance started.

Total System Global Area 839282688 bytes

Fixed Size 2257880 bytes

Variable Size 494930984 bytes

Database Buffers 339738624 bytes

Redo Buffers 2355200 bytes

Database mounted.

SQL>

4.使用alter database create datafile '/' as '/' 的方式，重建这个丢失的数据文件：

SQL> alter database create datafile 5;

Database altered.

5.查看文件是否已经创建

[root@node1 oradata]# cd node1

[root@node1 node1]# ll

total 1953452

-rw-r----- 1 oracle dba 104865792 Jan 24 02:48 bbb.dbf

-rw-r----- 1 oracle dba 104865792 Jan 24 02:44 bbb.dbf.bak

-rw-r----- 1 oracle dba 9748480 Jan 24 02:49 control01.ctl

可以看到文件bbb.dbf已经创建

6.通过归档日志和redo log对数据文件进行恢复

SQL> recover datafile 5;

Media recovery complete.

SQL> alter database open;

Database altered.

SQL> conn zw/zw
Connected.

SQL> select * from test1;
ID

----------

1

可以看到数据已经成功恢复；