如何通过BBED找回删除数据

         项目案例：客户删除delete了重要数据，无备份，客户联系我，要求恢复相应数据。本次通过实验方式重现客户现场。备份高于一切，首先备份，再操作

创建表格：

1. create table king(age number,name varchar2(20));
   

2. insert into king values(20,'rick');
   

3. insert into king values(30,'wuzy');
   

4. commit;

    

5. select dbms_rowid.rowid_relative_fno(rowid) rel_fno,dbms_rowid.rowid_block_number(rowid) blockno from king

    4     303

6. delete from king where age=30;

    

7. commit

结果：

bbed恢复(建议关闭数据库）：

set file 4,303

find /c wuzy

 File: /u01/app/oracle/oradata/orcl/users01.dbf (4)
 Block: 303              Offsets: 8173 to 8191           Dba:0x0100012f
------------------------------------------------------------------------
 77757a79 2c000202 c1150472 69636b01 064a2f

p kdbr

BBED> p kdbr
sb2 kdbr[0]                                 @118      8077
sb2 kdbr[1]                                 @120      8066

BBED> p *kdbr[0]
rowdata[11]
-----------
ub1 rowdata[11]                             @8177     0x2c

BBED> p *kdbr[1]
rowdata[0]
----------
ub1 rowdata[0]                              @8166     0x2c

BBED> set dba 4,303 offset 8173
 DBA             0x0100012f (16777519 4,303)
 OFFSET          8173

BBED> d /v dba 4,303 offset 8173
 File: /u01/app/oracle/oradata/orcl/users01.dbf (4)
 Block: 303     Offsets: 8173 to 8191  Dba:0x0100012f
-------------------------------------------------------
 77757a79 2c000202 c1150472 69636b01 l wuzy,....rick.
 06c42f                              l .

 <16 bytes per line>

BBED> d /v offset 8166
 File: /u01/app/oracle/oradata/orcl/users01.dbf (4)
 Block: 303     Offsets: 8166 to 8191  Dba:0x0100012f
-------------------------------------------------------
 3c020202 c11f0477 757a792c 000202c1 l <....wuzy,...
 15047269 636b0106 c42f              l ..rick..

 <16 bytes per line>

BBED> modify /x 2c
 File: /u01/app/oracle/oradata/orcl/users01.dbf (4)
 Block: 303              Offsets: 8166 to 8191           Dba:0x0100012f
------------------------------------------------------------------------
 2c020202 c11f0477 757a792c 000202c1 15047269 636b0106 c42f

 <32 bytes per line>

BBED> sum apply
Check value for File 4, Block 303:
current = 0x6436, required = 0x6436

结果：

删减数据已经恢复。

 注意：3C是已经删除的数据  2C是没有删除数据