Oracle数据库坏块进行修复
|
|
rman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--
源文档 <http://hi.baidu.com/wd%5Fyuan/blog/item/81b7a48dc19cd4cbfd1f108a.html>
|
