探索Oracle之RMAN_07 磁盘损坏数据丢失恢复

探索oracle之rman_07 磁盘损坏数据丢失恢复，有的时候在企业里面难免会出现由于磁盘损坏而导致数据库的故障乃至数据的丢失，那么

探索oracle之rman_07 磁盘损坏数据丢失恢复

[日期：2012-07-07] 来源：Linux社区  作者：吴伟龙 [字体：]

有的时候在企业里面难免会出现由于磁盘损坏而导致数据库的故障乃至数据的丢失，那么这个时候，那么这个时候数据的备份就显得尤为的重要。在这一节我们重点讨论下由于装载数据文件，redo日志文件，，controlfile控制文件的磁盘损坏的数据恢复。 

6.1 通过强制卸载磁盘模拟数据磁盘损坏：

[root@wwldb ~]# umount -f /DBData/

umount2: 资源或设备忙

umount: /DBData: device is busy

umount2: 资源或设备忙

umount: /DBData: device is busy

[root@wwldb ~]# fuser -m -k /DBData/     查看设备占用情况

/DBData/: 3508 3510  3512  3514 3516  3518  3529 3531  3535  3541 3610c

[root@wwldb ~]# fuser -m -k -i -k /DBData/   强制kill  /DBData相关进程

[root@wwldb ~]# umount -f /DBData/       卸载/DBData

[root@wwldb ~]#

看到实例也随之宕机了。

Fri Jul  616:03:33 2012

Errors in file/DBSoft/admin/WWL/bdump/wwl_pmon_3502.trc:

ORA-00471: DBWR process terminated with error

Fri Jul  616:03:33 2012

PMON: terminating instance due to error 471

Instance terminated by PMON, pid = 3502

[root@wwldb bdump]# ps -ef|grep ora

root     2965  2943  0 14:39 ?        00:00:00 hald-addon-storage: polling/dev/hdc

root     3944  3050  0 16:07 pts/2    00:00:00 su - Oracle

oracle   3945  3944  0 16:07 pts/2    00:00:00 -bash

oracle   3977  3945  0 16:07 pts/2    00:00:00 rlwrap sqlplus / as sysdba

oracle   3978  3977  0 16:07 pts/3    00:00:00 sqlplus   as sysdba

oracle   3979  3978  0 16:07 ?        00:00:00 oracleWWL(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))

root     4022  3980  0 16:10 pts/4    00:00:00 grep ora

[root@wwldb bdump]#

状态才能恢复

SQL> startup

ORACLE instance started.

Total System Global Area  100663296 bytes

Fixed Size                  1217884 bytes

Variable Size              88083108 bytes

Database Buffers            8388608 bytes

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Redo Buffers               2973696 bytes

ORA-00205: error in identifying control file, checkalert log for more info

Fri Jul  616:13:24 2012

ORA-00202: control file:'/DBData/oradata/WWL/control02.ctl'

ORA-27037: unable to obtain file status

Linux Error: 2: No such file or directory

Additional information: 3

Fri Jul  616:13:24 2012

ORA-205 signalled during: ALTER DATABASE   MOUNT...

SQL> show parameter control

NAME                                 TYPE        VALUE

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

control_file_record_keep_time        integer     7

control_files                        string      /DBSoft/oradata/WWL/control01.ctl, /DBData/oradata/WWL/control02.ctl, /DBData/oradata/WWL/control03.ctl

SQL> alter system set control_files ='/DBSoft/oradata/WWL/control01.ctl' scope=spfile;

System altered.

SQL> shutdown immediate

ORA-01507: database not mounted

ORACLE instance shut down.

SQL> startup mount;

ORACLE instance started.

Total System Global Area  100663296 bytes

Fixed Size                  1217884 bytes

Variable Size              88083108 bytes

Database Buffers            8388608 bytes

Redo Buffers                2973696 bytes

Database mounted.

SQL>