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：-07-07]
来源：Linux社区
作者：吴伟龙
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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
Errors in file/DBSoft/admin/WWL/bdump/wwl_pmon_3502.trc:
ORA-00471: DBWR process terminated with error
Fri Jul 616:03:33
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
Redo Buffers 2973696 bytes
ORA-00205: error in identifying control file, checkalert log for more info
Fri Jul 616:13:24
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
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>
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