背景：

1、PDM(Windchill)系统

2、exp数据错误，没有rman备份数据

3、数据库trc文件报错

Dump file d:\oracle\admin\wind\udump\wind_ora_5224.trc

Tue Jan 27 21:04:42 2015

ORACLE V9.2.0.1.0 - Production vsnsta=0

vsnsql=12 vsnxtr=3

Windows 2000 Version 5.2 Service Pack 2, CPU type 586

Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production

With the OLAP and Oracle Data Mining options

JServer Release 9.2.0.1.0 - Production

Windows 2000 Version 5.2 Service Pack 2, CPU type 586

Instance name: wind

Redo thread mounted by this instance: 1

Oracle process number: 11

Windows thread id: 5224, image: ORACLE.EXE

*** SESSION ID:(10.7) 2015-01-27 21:04:42.000

***

Corrupt block relative dba: 0x0141e21f (file 5, block 123423)

Fractured block found during buffer read

Data in bad block -

type: 6 format: 2 rdba: 0x0141e21f

last change scn: 0x0000.0f9e3838 seq: 0x1 flg: 0x06

consistency value in tail: 0x00000000

check value in block header: 0xe8ee, computed block checksum: 0x768a

spare1: 0x0, spare2: 0x0, spare3: 0x0

***

Reread of rdba: 0x0141e21f (file 5, block 123423) found same corrupted data

解决办法：

1、首先通过命令定位数据块对应表

SELECT tablespace_name, segment_type, owner, segment_name FROM dba_extents WHERE file_id = 5 and 123423 between block_id AND block_id + blocks - 1;

SQL> conn ob62/ob62

已连接。

SQL> select count(1) from stringvalue;

select count(1) from stringvalue

*

ERROR 位于第 1 行:

ORA-01578: ORACLE 数据块损坏(文件号5，块号123423)

ORA-01110: 数据文件 5: 'D:\ORACLE\ORADATA\WIND\USERS01.DBF'

2、执行语句ALTER SYSTEM SET EVENTS='10231 trace name context forever,level 10'; 此语句表示全表扫描的时候跳过坏块

3、exp相关表数据

4、删除坏块对应表数据

5、删除表数据

6、imp备份表数据

7、启动系统