oracle数据文件被删除没备份恢复

最新推荐文章于 2022-11-29 14:00:10 发布

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#create datafile #数据文件丢失恢复

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本文介绍了在数据库开启归档且无备份的情况下，如何恢复意外删除的数据文件。通过创建新的数据文件并利用归档日志进行恢复，详细步骤包括：删除数据文件模拟丢失、将数据库启动到挂载状态、重建数据文件、以及执行恢复操作。

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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.youkuaiyun.com/zhengwei125/article/details/50696799
没重启恢复： http://blog.youkuaiyun.com/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；