通过dbv和rman blockrecover对Oracle数据库坏块进行修复笔记

man备份时alert.log报如下错误:

Fri Jul  2 12:41:36 2010
Hex dump of (file 12, block 2718618) in trace file /u01/app/oracle/admin/bi/udump/bi_ora_31213.trc
Corrupt block relative dba: 0x03297b9a (file 12, block 2718618)
Fractured block found during backing up datafile
Data in bad block:
type: 6 format: 2 rdba: 0x03297b9a
last change scn: 0x0002.482fc15b seq: 0x1 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x77b20601
check value in block header: 0x253
computed block checksum: 0xb6e9
Reread of blocknum=2718618, file=/u01/oradata/BI/estaging_user01.712.714072365. found same corrupt data
Reread of blocknum=2718618, file=/u01/oradata/BI/estaging_user01.712.714072365. found same corrupt data
Reread of blocknum=2718618, file=/u01/oradata/BI/estaging_user01.712.714072365. found same corrupt data
Reread of blocknum=2718618, file=/u01/oradata/BI/estaging_user01.712.714072365. found same corrupt data
Reread of blocknum=2718618, file=/u01/oradata/BI/estaging_user01.712.714072365. found same corrupt data

查询数据库,可知含有坏块的对象:

SQL> col SEGMENT_NAME format a20
col PARTITION_NAME format a10
select owner,segment_name,partition_name from dba_extents where file_id = 12 and 2718618 between block_id and block_id + blocks-1;
OWNER                SEGMENT_NAME         PARTITION_
-------------------- -------------------- ----------
ESTAGING             LOG_RECORD_DETAIL_4  P20100630

但全表扫描却没有任何问题:

SQL> select count(*) from ESTAGING.LOG_RECORD_DETAIL_4 partition (P20100630);
COUNT(*)
----------
449937

SQL> select count(*) from ESTAGING.LOG_RECORD_DETAIL_4;
COUNT(*)
----------
42049608

使用dbv检查发现有一个坏块(耗时较长):

$ dbv file=/u01/oradata/BI/estaging_user01.712.714072365 BLOCKSIZE=8192

DBVERIFY: Release 10.2.0.4.0 - Production on Fri Jul 2 14:15:49 2010

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

DBVERIFY - Verification starting : FILE = /u01/oradata/BI/estaging_user01.712.714072365

Page 2718618 is influx - most likely media corrupt
Corrupt block relative dba: 0x03297b9a (file 12, block 2718618)
Fractured block found during dbv: 
Data in bad block:
type: 6 format: 2 rdba: 0x03297b9a
last change scn: 0x0002.482fc15b seq: 0x1 flg: 0x06
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x77b20601
check value in block header: 0x253
computed block checksum: 0xb6e9

DBVERIFY - Verification complete

Total Pages Examined         : 2748160
Total Pages Processed (Data) : 2462446
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 235234
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 24969
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 25510
Total Pages Marked Corrupt   : 1
Total Pages Influx           : 1
Highest block SCN            : 1229607770 (2.1229607770)

使用rman检查含有坏块的数据文件(耗时较长), 期间观察alert.log会发现同样的提示:

RMAN> backup validate datafile 12;

这个时候访问v$database_block_corruption可以看到详细的坏块的信息:

SQL> select * from v$database_block_corruption;
FILE#     BLOCK#     BLOCKS CORRUPTION_CHANGE# CORRUPTIO
---------- ---------- ---------- ------------------ ---------
12    2718618          1                  0 FRACTURED

使用rman进行块恢复:

RMAN> blockrecover datafile 12 block 2718618 from backupset;

块恢复后, 执行BLOCKRECOVER CORRUPTION LIST,会自动按照V$DATABASE_BLOCK_CORRUPTION进行修复(耗时较长):

RMAN> BLOCKRECOVER CORRUPTION LIST;

这个时候再访问v$database_block_corruption就看不到详细的坏块信息了:

SQL> select * from v$database_block_corruption;
no rows selected

再使用dbv检查发现没有坏块了(耗时较长):

$ dbv file=/u01/oradata/BI/estaging_user01.712.714072365 BLOCKSIZE=8192

DBVERIFY: Release 10.2.0.4.0 - Production on Fri Jul 2 15:38:15 2010

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

DBVERIFY - Verification starting : FILE = /u01/oradata/BI/estaging_user01.712.714072365

DBVERIFY - Verification complete

Total Pages Examined         : 2749440
Total Pages Processed (Data) : 2463763
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 235250
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 24981
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 25446
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Highest block SCN            : 1230819157 (2.1230819157)

完事!

--End--



本文转自einyboy博客园博客,原文链接:http://www.cnblogs.com/einyboy/archive/2013/03/12/2955671.html,如需转载请自行联系原作者。


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