Extent Header:: spare1: 0 spare2: 0 #extents: 1 #blocks: 8
last map 0x00000000 #maps: 0 offset: 2716
Highwater:: 0x010000b0 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 8
mapblk 0x00000000 offset: 0
Unlocked
--------------------------------------------------------
Low HighWater Mark :
Highwater:: 0x010000b0 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 8
mapblk 0x00000000 offset: 0
Level 1 BMB for High HWM block: 0x010000a8
Level 1 BMB for Low HWM block: 0x010000a8
--------------------------------------------------------
Segment Type: 1 nl2: 1 blksz: 8192 fbsz: 0
L2 Array start offset: 0x00001434
First Level 3 BMB: 0x00000000
L2 Hint for inserts: 0x010000a9
Last Level 1 BMB: 0x010000a8
Last Level II BMB: 0x010000a9
Last Level III BMB: 0x00000000
Map Header:: next 0x00000000 #extents: 1 obj#: 75131 flag: 0x10000000
Inc # 0
Extent Map
-----------------------------------------------------------------
0x010000a8 length: 8
Auxillary Map
--------------------------------------------------------
Extent 0 : L1 dba: 0x010000a8 Data dba: 0x010000ab
--------------------------------------------------------
Second Level Bitmap block DBAs
--------------------------------------------------------
DBA 1: 0x010000a9
End dump data blocks tsn: 4 file#: 4 minblk 170 maxblk 170
2、将Uedit32（通过16进制编辑功能）编辑过的数据文件上传到数据库
13:59:58 SYS@ prod>alter system flush buffer_cache;
System altered.
读取数据出错：
14:00:05 SYS@ prod>select * from scott.emp1;
select * from scott.emp1
*
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 4, block # 170)
ORA-01110: data file 4: '/u01/app/oracle/oradata/prod/users01.dbf'
验证数据文件：
[oracle@rh6 ~]$ dbv file=/u01/app/oracle/oradata/prod/users01.dbf blocksize=8192
DBVERIFY: Release 11.2.0.1.0 - Production on Tue Jul 15 13:59:41 2014
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
DBVERIFY - Verification starting : FILE = /u01/app/oracle/oradata/prod/users01.dbf
Page 170 is marked corrupt
Corrupt block relative dba: 0x010000aa (file 4, block 170)
Bad check value found during dbv:
Data in bad block:
type: 35 format: 2 rdba: 0x010000aa
last change scn: 0x0000.001f891c seq: 0x2 flg: 0x04
spare1: 0x0 spare2: 0x0 spare3: 0x0
consistency value in tail: 0x891c2302
check value in block header: 0x8eee
computed block checksum: 0x2020
Page 171 is marked corrupt
Corrupt block relative dba: 0x010000ab (file 4, block 171)
Bad header found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x012020ab
last change scn: 0x2020.201f890b seq: 0x2 flg: 0x04
spare1: 0x20 spare2: 0x20 spare3: 0x2020
consistency value in tail: 0x890b0602
check value in block header: 0xcf8b
computed block checksum: 0x2e00
Page 172 is marked corrupt
Corrupt block relative dba: 0x010000ac (file 4, block 172)
Bad header found during dbv:
Data in bad block:
type: 6 format: 2 rdba: 0x012020ac
last change scn: 0x2020.201f891c seq: 0x3 flg: 0x06
spare1: 0x20 spare2: 0x20 spare3: 0x2020
consistency value in tail: 0x891c0603
check value in block header: 0xa5b1
computed block checksum: 0x0
Page 173 is marked corrupt
Corrupt block relative dba: 0x010000ad (file 4, block 173)
Bad header found during dbv:
Data in bad block:
type: 6 format