案例:Oracle很是規恢復 ASM磁盤組diskgroup被刪除使用kfed進行完美恢復

時間 2019-11-30

標籤案例 oracle 很是恢復 asm 磁盤 diskgroup 刪除使用 kfed 進行完美欄目 Oracle 简体版

原文原文鏈接

Oracle RAC環境ASM磁盤組被強制刪除，使用kfed工具完美恢復誤刪除磁盤組案例

在某些狀況下,可能由於誤操做,不小先drop diskgroup,這個時候千萬別緊張,出現此類故障,能夠經過kfed進行完美恢復(數據0丟失).若是進一步損壞了相關asm disk,那後續恢復就很麻煩了,可能須要使用dul掃描磁盤來進行搶救性恢復,並且可能致使數據丟失.html

1.建立Oracle環境中的測試磁盤組

[grid@oracleplus ~]$ sqlplus / as sysasm

SQL*Plus: Release 11.2.0.4.0 Production on Thu Apr 30 15:12:08 2015

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 Automatic Storage Management option

SQL>  select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU
------------------------------ ------------------------------ ------------
                               /dev/asm-disk3                 CANDIDATE
DATA_0000                      /dev/asm-disk1                 MEMBER
DATA_0001                      /dev/asm-disk2                 MEMBER

SQL> create diskgroup oracleplus external redundancy disk '/dev/asm-disk3';

Diskgroup created.

SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU
------------------------------ ------------------------------ ------------
oracleplus_0000                  /dev/asm-disk3                 MEMBER
DATA_0000                      /dev/asm-disk1                 MEMBER
DATA_0001                      /dev/asm-disk2                 MEMBER

使用/dev/asm-disk3這個磁盤建立磁盤組oracleplus

建立表,存儲在oracleplus磁盤組中sql

[oracle@oracleplus ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Apr 30 15:14:55 2015

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, Automatic Storage Management, OLAP, Data Mining
and Real Application Testing options

SQL> create tablespace oracleplus datafile '+oracleplus' size 100M;

Tablespace created.

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
+DATA/oracleplus/datafile/system.256.878224279
+DATA/oracleplus/datafile/sysaux.257.878224279
+DATA/oracleplus/datafile/undotbs1.258.878224279
+DATA/oracleplus/datafile/users.259.878224279
+oracleplus/oracleplus/datafile/oracleplus.256.878397315

SQL> create table t_oracleplus tablespace oracleplus
  2  as select * from dba_objects;

Table created.

SQL> select count(*) from t_oracleplus;

  COUNT(*)
----------
     86259

經過在磁盤組中建立表空間,從而實現表oracleplus存放在測試磁盤組中數據庫

2.嘗試刪除磁盤組oracleplus

SQL> drop diskgroup oracleplus;
drop diskgroup oracleplus
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15053: diskgroup "oracleplus" contains existing files

SQL> drop diskgroup oracleplus  including contents;
drop diskgroup oracleplus  including contents
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15027: active use of diskgroup "oracleplus" precludes its dismount


[grid@oracleplus ~]$ asmcmd
ASMCMD> lsof
DB_Name   Instance_Name  Path                                                
oracleplus  oracleplus       +data/oracleplus/controlfile/current.260.878224379    
oracleplus  oracleplus       +data/oracleplus/datafile/sysaux.257.878224279        
oracleplus  oracleplus       +data/oracleplus/datafile/system.256.878224279        
oracleplus  oracleplus       +data/oracleplus/datafile/undotbs1.258.878224279      
oracleplus  oracleplus       +data/oracleplus/datafile/users.259.878224279         
oracleplus  oracleplus       +data/oracleplus/onlinelog/group_1.261.878224381      
oracleplus  oracleplus       +data/oracleplus/onlinelog/group_2.262.878224383      
oracleplus  oracleplus       +data/oracleplus/onlinelog/group_3.263.878224385      
oracleplus  oracleplus       +data/oracleplus/tempfile/temp.264.878224395          
oracleplus  oracleplus       +oracleplus/oracleplus/datafile/oracleplus.256.878397315

因爲oracleplus磁盤組被實例使用,所以磁盤組沒法刪除,報ORA-15027錯誤
因爲oracleplus磁盤組中有文件,所以磁盤組沒法刪除,報ORA-15053錯誤
若是這兩個阻止你誤刪除磁盤組的警告依然不能救你,那我也很差多說啥了,只能向我同樣繼續往下bash

3.關閉數據庫實例,刪除磁盤組

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> drop diskgroup oracleplus;
drop diskgroup oracleplus
*
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15053: diskgroup "oracleplus" contains existing files


SQL> drop diskgroup oracleplus  including contents;

Diskgroup dropped.


SQL>  select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU
------------------------------ ------------------------------ ------------
                               /dev/asm-disk3                 FORMER
DATA_0000                      /dev/asm-disk1                 MEMBER
DATA_0001                      /dev/asm-disk2                 MEMBER

SQL> alter diskgroup oracleplus mount;
alter diskgroup oracleplus mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15017: diskgroup "oracleplus" cannot be mounted
ORA-15063: ASM discovered an insufficient number of disks for diskgroup
"oracleplus"

磁盤組被drop以後,沒法正常mount,mount之時報ORA-15063湊無oracle

4.使用kfed工具恢復刪除磁盤組

[grid@oracleplus ~]$ kfed read /dev/asm-disk3 >/tmp/disk3-0-0
[grid@oracleplus ~]$ kfed  read /dev/asm-disk3  blkn=1 >/tmp/disk3-0-1
[grid@oracleplus ~]$ kfed  read /dev/asm-disk3  aun=1 >/tmp/disk3-1-0
經過vi修改這些/tmp/disk3-*中的部分值
[grid@oracleplus ~]$ kfed merge /dev/asm-disk3 text=/tmp/disk3-0-0
[grid@oracleplus ~]$ kfed merge /dev/asm-disk3  blkn=1 text=/tmp/disk3-0-1
[grid@oracleplus ~]$ kfed merge /dev/asm-disk3 aun=1 text=/tmp/disk3-1-0

查詢修復後的asm disk工具

SQL> col path for a30
SQL> set lines 150
SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU
------------------------------ ------------------------------ ------------
                               /dev/asm-disk3                 MEMBER
DATA_0000                      /dev/asm-disk1                 MEMBER
DATA_0001                      /dev/asm-disk2                 MEMBER

5.嘗試mount oracleplus 磁盤組

SQL> alter diskgroup oracleplus mount;

Diskgroup altered.

SQL> select name,path,header_status from v$asm_disk;

NAME                           PATH                           HEADER_STATU
------------------------------ ------------------------------ ------------
oracleplus_0000                  /dev/asm-disk3                 MEMBER
DATA_0000                      /dev/asm-disk1                 MEMBER
DATA_0001                      /dev/asm-disk2                 MEMBER

測試恢復後磁盤組測試

SQL> startup   
ORACLE instance started.

Total System Global Area  952020992 bytes
Fixed Size                  2258960 bytes
Variable Size             306186224 bytes
Database Buffers          637534208 bytes
Redo Buffers                6041600 bytes
Database mounted.
Database opened.
SQL>  select count(*) from t_oracleplus;

  COUNT(*)
----------
     86259

這裏證實,當磁盤組被誤刪除後,當即中止進一步損壞,能夠經過kfed進行完美恢復

spa

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原文惟一網址：http://www.oracleplus.net/arch/oracle-20160602-265.html