ASM来用DD命令模拟坏块

会话1：oracle

SQL> create tablespace test datafile '+DATA/ora11g23/datafile/test.dbf' size 10m;

Tablespace created.

SQL> select file_id,file_name from dba_data_files ;

... ...

6 +DATA/ora11g23/datafile/test.dbf

6 rows selected.

SQL> alter database datafile 6 offline;

Database altered.

会话2：grid

ASMCMD> cp test.dbf /tmp/test.dbf

copying +DATA/ora11g23/datafile/test.dbf -> /tmp/test.dbf

会话3：root

[root@oel6 tmp]# dd if=/dev/zero of=/tmp/test.dbf count=10 seek=131 bs=8192 conv=notrunc

10+0 records in

10+0 records out

81920 bytes (82 kB) copied, 0.000513171 s, 160 MB/s

会话4：oracle

执行dbv校验

[oracle@oel6 ~]$ dbf file=/tmp/test.dbf blocksize=8192

-bash: dbf: command not found

[oracle@oel6 ~]$ dbv file=/tmp/test.dbf blocksize=8192

DBVERIFY: Release 11.2.0.3.0 - Production on Tue Mar 17 11:15:56 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

DBVERIFY - Verification starting : FILE = /tmp/test.dbf

Page 131 is marked corrupt

Corrupt block relative dba: 0x01800083 (file 6, block 131)

Completely zero block found during dbv:

Page 132 is marked corrupt

Corrupt block relative dba: 0x01800084 (file 6, block 132)

Completely zero block found during dbv:

Page 133 is marked corrupt

Corrupt block relative dba: 0x01800085 (file 6, block 133)

Completely zero block found during dbv:

... ....

DBVERIFY - Verification complete

Total Pages Examined         : 1280

Total Pages Processed (Data) : 0

Total Pages Failing   (Data) : 0

Total Pages Processed (Index): 0

Total Pages Failing   (Index): 0

Total Pages Processed (Other): 127

Total Pages Processed (Seg)  : 0

Total Pages Failing   (Seg)  : 0

Total Pages Empty            : 1143

Total Pages Marked Corrupt   : 10

Total Pages Influx           : 0

Total Pages Encrypted        : 0

Highest block SCN            : 1409085 (0.1409085)

此时

会话2：grid

ASMCMD> cp /tmp/test.dbf test.dbf

copying /tmp/test.dbf -> +DATA/ora11g23/datafile/test.dbf

会话1：oracle

SQL> alter database datafile 6 online;

alter database datafile 6 online

*

ERROR at line 1:

ORA-01113: file 6 needs media recovery

ORA-01110: data file 6: '+DATA/ora11g23/datafile/test.dbf'

数据块损坏，文件无法加载，需要做介质恢复了。