oracle 学习笔记 利用RMAN修复数据文件中的坏块
利用RMAN修复数据文件中的坏块
1
、创建测试表：
SQL> create table tab_dbv tablespace ghost as select * from dba_objects;
表已创建。
SQL> insert into tab_dbv select * from tab_dbv;
已创建
50363
行。
SQL> insert into tab_dbv select * from tab_dbv;
已创建
100726
行。
SQL> commit;
提交完成。
2
、查找
tab_dbv
的块头：
SQL> select segment_name,header_block from dba_segments where segment_name='TAB_DBV';
SEGMENT_NAME HEADER_BLOCK
------------------------- ------------
TAB_DBV 35
SQL> select to_char(35*8*1024,'xxxxxxxxxxxxxxxxxxxxxx') from dual;
TO_CHAR(35*8*1024,'XXXX
-----------------------
46000
SQL> select to_char(36*8*1024,'xxxxxxxxxxxxxxxxxxxxxx') from dual;
TO_CHAR(36*8*1024,'XXXX
-----------------------
48000
我们使用
UE
修改
46000H
到
48000H
之间的数据。
启动数据库，查询：
SQL> select count(*) from tab_dbv;
select count(*) from tab_dbv
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 560)
ORA-01110: data file 6: 'E:\ORACLE\PRODUCT\10.2.0\ORADATA\HUNT\GHOST_001.DBF'
使用
DBV
对数据文件进行检查：
C:\>dbv file='E:\oracle\product\10.2.0\oradata\hunt\GHOST_001.DBF'
......
Page 560 is marked corrupt
Corrupt block relative dba: 0x01800230 (file 6, block 560) ---
第一个坏块位置
……
Page 576 is marked corrupt
Corrupt block relative dba: 0x01800240 (file 6, block 576) ---
第二个坏块位置
DBVERIFY - Verification complete
Total Pages Examined : 14080
Total Pages Processed (Data) : 2782
Total Pages Failing (Data) : 0
Total Pages Processed (Index): 88
Total Pages Failing (Index): 0
Total Pages Processed (Other): 80
Total Pages Processed (Seg) : 0
Total Pages Failing (Seg) : 0
Total Pages Empty : 11128
Total Pages Marked Corrupt : 2
-----
有两个块损坏。
Total Pages Influx : 0
Highest block SCN : 1255980 (0.1255980)
2
、检查坏块：
RMAN> backup validate database;
SQL>select * from v$database_block_corruption;
|
|
FILE#
|
BLOCK#
|
BLOCKS
|
CORRUPTION_CHANGE#
|
CORRUPTION_TYPE
|
|
1
|
6
|
576
|
1
|
0
|
CORRUPT
|
|
2
|
6
|
560
|
1
|
0
|
CORRUPT
|
与
DBV
报出的结果一致。
3
、修复坏块：
RMAN> blockrecover datafile 6 block 560;
---
此命令是
10G
才有的，
9I
不支持。
RMAN> backup validate datafile 6;
---
重新检验。
SQL>select * from v$database_block_corruption;
|
|
FILE#
|
BLOCK#
|
BLOCKS
|
CORRUPTION_CHANGE#
|
CORRUPTION_TYPE
|
|
1
|
6
|
576
|
1
|
0
|
CORRUPT
|
SQL> select count(*) from tab_dbv;
select count(*) from tab_dbv
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 6, block # 576)
---
此时报
576
损坏，说明
560
已修复
ORA-01110: data file 6: 'E:\ORACLE\PRODUCT\10.2.0\ORADATA\HUNT\GHOST_001.DBF'
说明：
存在坏块时
RMAN
备份无法进行，如：
RMAN> backup datafile 6;
Starting backup at 26-MAY-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00006 name=E:\ORACLE\PRODUCT\10.2.0\ORADATA\HUNT\GHOST_001.DBF
channel ORA_DISK_1: starting piece 1 at 26-MAY-12
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 05/26/2012 08:54:40
ORA-19566: exceeded limit of 0 corrupt blocks for file
E:\ORACLE\PRODUCT\10.2.0\ORADATA\HUNT\GHOST_001.DBF
我们可以修改
corrupt
的允许数量（默认为
0
）对数据文件进行备份。在执行
RUN
脚本时指定
maxcorrupt
即可：
RUN {
Set maxcorrupt for datafile 6 to 1;
Backup datafile 6;
…..
}
在命令行方式下执行会报错：
RMAN> Set maxcorrupt for datafile 6 to 1;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03031: this option of set command needs to be used inside a run block
按同样方法修复
(file # 6, block # 576)
：
RMAN> blockrecover datafile 6 block 576;
RMAN> backup validate datafile 6;
SQL>select * from v$database_block_corruption;
no rows selected
查询数据：
SQL> select count(*) from tab_dbv;
COUNT(*)
----------
201452
修复成功！