Explore Oracle RMAN_07 control file loss recovery

Explore the Oracle RMAN_07 control file loss recovery. Based on the control file's composite multi-path nature, there are two types of loss: one is the damage or loss of a control file, the other

Explore the Oracle RMAN_07 control file loss recovery. Based on the control file's composite multi-path nature, there are two types of loss: one is the damage or loss of a control file, the other

1,Control File(Controlfile)Loss recovery

Based on the control file's compound multi-path nature, there are two types of loss: one is the damage or loss of a control file, and the other is the loss of all control files. In the first case, you only need to copy the control file to the path of the corrupt or lost control file. In the second case, backup information is required to restore the control file or manually recreate the control file.

Loss of a single control file judgment and recovery.

SQL> shutdown immediate

ORA-00210: cannot open the specified control file

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

ORA-27041: unable to open file

LinuxError: 2: No such file or directory

Additionalinformation: 3

The database must be forcibly closed.

SQL> shutdown abort;

Oracleinstance shut down.

An error occurred while verifying the control file when starting the database. Check the alarm log file.

SQL> startup

ORACLEinstance started.

TotalSystem Global Area 285212672 bytes

FixedSize 1218968 bytes

VariableSize 104859240 bytes

DatabaseBuffers 171966464 bytes

RedoBuffers 7168000 bytes

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

View the alarm log. The system prompts that the alarm cannot be found.Controlfile2

Fri Jun 2012

Errors infile/DBSoft/admin/WWL/udump/wwl_ora_4816.trc:

ORA-00210: cannot open the specified control file

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

ORA-27041: unable to open file

LinuxError: 2: No such file or directory

From the above information, we can conclude that the database cannot be started or shut down due to the loss of the control file. What we need to do is to restore the control file, because we know that the control file has repeated multi-path attributes, three control files are generated by default. The control file is displayed in the log.2Lost, cannot be found, we can control the file1And3To restore2.

4.1Recover corrupt control files based on normal control files

1View the path of the Control File

SQL> show parameter control_files

NAME TYPE VALUE

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

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

SQL>

We can see from the above that the database has three control files, one of which is stored in/DBSoftIn bytesOradata/wwl/Directory, the other two control files exist/DBDataDirectory/Oradata/wwl/From the above information, we can obtainControl02.ctlDatabase faults are caused by the loss of control files.

2Check whether the control file does not exist or is damaged.

[Oracle @ wwldb WWL] $ cd/DBData/oradata/WWL/

[Oracle @ wwldb WWL] $ ll

Total 0

[Oracle @ wwldb WWL] $

It's a strange thing. Why is there no control file in this directory? Check whether the control file exists.

[Oracle @ wwldb WWL] $ cd/DBSoft/oradata/WWL/

[Oracle @ wwldb WWL] $ ls

Control01.ctl

.

3, Shut down the database

SQL> shutdown abort

ORACLE instance shut down.

SQL>

4Recover lost control files

[Oracle @ wwldbWWL] $ ls

Control01.ctl

[Oracle @ wwldbWWL] $ pwd

/DBSoft/oradata/WWL

[Oracle @ wwldbWWL] $ ls

Control01.ctl

[Oracle @ wwldbWWL] $ cp control01.ctl/DBData/oradata/WWL/control02.ctl

[Oracle @ wwldbWWL] $ cp control01.ctl/DBData/oradata/WWL/control03.ctl

[Oracle @ wwldbWWL] $ ll/DBData/oradata/WWL/

Total13792

-Rw-r ----- 1 oracle oinstall 7061504 Jun 22 control02.ctl

-Rw-r ----- 1 oracle oinstall 7061504 Jun 22 control03.ctl

[Oracle @ wwldb WWL] $

2,Start Database

SQL> startup

ORACLEinstance started.

Total SystemGlobal Area285212672 bytes

FixedSize1218968 bytes

VariableSize104859240 bytes

DatabaseBuffers171966464 bytes

RedoBuffers7168000 bytes

Databasemounted.

Databaseopened.

SQL>

All control files are lost.

Loss of a single control file judgment and recovery.

No.

SQL> shutdown immediate

ORA-00210: cannot open the specified control file

ORA-00202: control file: '/DBSoft/oradata/WWL/control01.ctl'

ORA-27041: unable to open file

LinuxError: 2: No such file or directory

Additionalinformation: 3

The database must be forcibly closed.

SQL> shutdown abort;

ORACLEinstance shut down.

An error occurred while verifying the control file when starting the database. Check the alarm log file.

SQL> startup

ORACLEinstance started.

TotalSystem Global Area 285212672 bytes

FixedSize 1218968 bytes

VariableSize 104859240 bytes

DatabaseBuffers 171966464 bytes

RedoBuffers 7168000 bytes

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

View the alarm log. The alarm cannot be found.Controlfile1

Fri Jun 22 13:16:07 2012

Errors in file/DBSoft/admin/WWL/udump/wwl_ora_5104.trc:

ORA-00210: cannot open the specified control file

ORA-00202: control file: '/DBSoft/oradata/WWL/control01.ctl'

ORA-27041: unable to open file

Linux Error: 2: No such file or directory

Additional information: 3

PassRMANTo restore the control file:

SQL> startupforce nomount;

ORACLE instancestarted.

Total SystemGlobal Area 285212672 bytes

Fixed Size 1218968 bytes

VariableSize 109053544 bytes

Database Buffers 167772160 bytes

RedoBuffers 7168000 bytes

SQL> exit

Control file recovery

RMAN> restore controlfile;

3,Open Database

SQL> alter database mount;

Database altered.

SQL> alter database open;

Database altered.

Related reading:

Exploring the RMAN_01 concept of Oracle

Explore the basic use of RMAN_02 in Oracle

Explore Oracle-based RMAN_03 non-consistent backup

Explore Oracle-based RMAN_04 non-consistent backup

Explore RMAN_05 Incremental Backup in Oracle

Exploring Oracle's RMAN_06 backup policy

Explore Oracle RMAN_07 restoration of single data file loss

Explore Oracle RMAN_07 recovery of whole business tablespace loss

Explore Oracle RMAN_07 disk corruption data loss recovery

Explore Oracle RMAN_07 recovery of all database files lost

Explore Oracle RMAN_07 redo log redu file loss recovery

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Explore Oracle RMAN_07 control file loss recovery

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