1、创建模拟表
SQL> create table hr.b(id number,name varchar2(100)) tablespace xff;
Table created.
SQL> insert into hr.b values(1,’aaa’);
1 row created.
Commit complete.
2、查看数据位置
QL> select rowid,
2 dbms_rowid.rowid_relative_fno(rowid)rel_fno,
3 dbms_rowid.rowid_block_number(rowid)blockno,
4 dbms_rowid.rowid_row_number(rowid) rowno
5 from hr.b;
ROWID REL_FNO BLOCKNO ROWNO
—————— ———- ———- ———-
AAAHytAACAAAAIKAAA 2 522 0
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
虽然bbed 可以在db open 状态来进行修改，但是建议在做任何修改操作之前先shutdown db。 这样避免checkpoint 进程重写bbed 对block 的修改。 也避免oracle 在bbed 修改完成之前读block 或者申明block 为corrupt。
[oracle@localhost ~]$ bbed parfile=/tmp/parfile.cnf（/tmp/parfile.cnf文件见
bbed破坏数据文件）
Password:
BBED: Release 2.0.0.0.0 – Limited Production on Sat Aug 20 17:10:24 2011
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
************* !!! For Oracle Internal Use only !!! ***************
BBED> show all
FILE# 2
BLOCK# 1
OFFSET 0
DBA 0x00800001 (8388609 2,1)
FILENAME /opt/oracle/oradata/xifenfei/xff01.dbf
BIFILE bifile.bbd
LISTFILE /tmp/list
BLOCKSIZE 8192
MODE Edit
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
3、设置dba位置
BBED> set dba 2,522
DBA 0x0080020a (8389130 2,522)
4、查询aaa位置
BBED> find /c aaa
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 522 Offsets: 8185 to 8191 Dba:0x0080020a
————————————————————————
61616101 067735
<32 bytes per line>
5、查看该位置内容
BBED> dump /v offset 8185
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 522 Offsets: 8185 to 8191 Dba:0x0080020a
——————————————————-
61616101 067735 l aaa..w5
<16 bytes per line>
BBED> show all
FILE# 2
BLOCK# 522
OFFSET 8185
DBA 0x0080020a (8389130 2,522)
FILENAME /opt/oracle/oradata/xifenfei/xff01.dbf
BIFILE bifile.bbd
LISTFILE /tmp/list
BLOCKSIZE 8192
MODE Edit
EDIT Unrecoverable
IBASE Dec
OBASE Dec
WIDTH 80
COUNT 512
LOGFILE log.bbd
SPOOL No
6、修改aaa为bbb
BBED> modify /c bbb
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 522 Offsets: 8185 to 8191 Dba:0x0080020a
————————————————————————
62626201 067735
<32 bytes per line>
BBED> dump /v
File: /opt/oracle/oradata/xifenfei/xff01.dbf (2)
Block: 522 Offsets: 8185 to 8191 Dba:0x0080020a
——————————————————-
62626201 067735 l bbb..w5
<16 bytes per line>
7、应用变更
BBED> sum
Check value for File 2, Block 522:
current = 0xa285, required = 0xa286
此时 current checksum 是0xa285，requiredchecksum 是0xa286
BBED> sum apply
Check value for File 2, Block 522:
current = 0xa286, required = 0xa286
加上apply参数，使checksum一致。即之前的修改生效。
8、开启数据测试
SQL> startup
ORACLE instance started.
Total System Global Area 236000356 bytes
Fixed Size 451684 bytes
Variable Size 201326592 bytes
Database Buffers 33554432 bytes
Redo Buffers 667648 bytes
Database mounted.
Database opened.
SQL> col name for a20
SQL> select * from hr.b;
ID NAME
———- ——————–
1 bbb
