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利用BBED恢复数据文件头

时间：2021-07-01 10:21:17 帮助过：22人阅读

转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/31018075 @@@@@@@利用BBED模拟损坏5文件1号块（文件头） BBED copy file 4 block 4 to file 5 block 1 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5) Block: 1 Offsets: 0 to 19 Dba:0x01

转载请注明出处：http://blog.csdn.net/guoyjoe/article/details/31018075

@@@@@@@利用BBED模拟损坏5文件1号块（文件头）

BBED> copy file 4 block 4 to file 5 block 1
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:    0 to   19           Dba:0x01400001
------------------------------------------------------------------------
 1ea20000 04000001 1a4b0000 00000104 99810000 
 <32 bytes per line>
sys@PROD> shutdown abort;
ORACLE instance shut down.
sys@PROD> starup
SP2-0042: unknown command "starup" - rest of line ignored.
sys@PROD> startup
ORACLE instance started.
Total System Global Area  939495424 bytes
Fixed Size                  2233960 bytes
Variable Size             251660696 bytes
Database Buffers          679477248 bytes
Redo Buffers                6123520 bytes
Database mounted.
ORA-01122: database file 5 failed verification check
ORA-01110: data file 5: '/u01/app/oracle/oradata/PROD/tp01.dbf'
ORA-01210: data file header is media corrupt

BBED开始恢复

1、找个文件头覆盖

<strong>BBED> copy file 4 block 1 to file 5 block 1
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:    0 to   19           Dba:0x01400001
------------------------------------------------------------------------
 0ba20000 01000001 00000000 00000104 edbc0000 
 <32 bytes per line>
</strong>

2、进入5文件1号块

BBED> set file 5 block 1
        FILE#           5
        BLOCK#          1

（1）改块的地址5文件1号块，rdba_kcbh

BBED> p kcvfhbfh
struct kcvfhbfh, 20 bytes                   @0       
   ub1 type_kcbh                            @0        0x0b
   ub1 frmt_kcbh                            @1        0xa2
   ub1 spare1_kcbh                          @2        0x00
   ub1 spare2_kcbh                          @3        0x00
   ub4 rdba_kcbh                            @4        0x01000001
   ub4 bas_kcbh                             @8        0x00000000
   ub2 wrp_kcbh                             @12       0x0000
   ub1 seq_kcbh                             @14       0x01
   ub1 flg_kcbh                             @15       0x04 (KCBHFCKV)
   ub2 chkval_kcbh                          @16       0xbced
   ub2 spare3_kcbh                          @18       0x0000

BBED> d /v offset 4
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:    4 to   23  Dba:0x01400001
-------------------------------------------------------
 01000001 00000000 00000104 edbc0000 l ............í?..
 00000000    
BBED> m /x  01004001 offset 4
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:    4 to   23           Dba:0x01400001
------------------------------------------------------------------------
 01004001 00000000 00000104 edbc0000 00000000

(2)文件的大小kccfhfsz

BBED> p kcvfhhdr
struct kcvfhhdr, 76 bytes                   @20      
   ub4 kccfhswv                             @20       0x00000000
   ub4 kccfhcvn                             @24       0x0b200000
   ub4 kccfhdbi                             @28       0x0f302c3e
   text kccfhdbn[0]                         @32      P
   text kccfhdbn[1]                         @33      R
   text kccfhdbn[2]                         @34      O
   text kccfhdbn[3]                         @35      D
   text kccfhdbn[4]                         @36       
   text kccfhdbn[5]                         @37       
   text kccfhdbn[6]                         @38       
   text kccfhdbn[7]                         @39       
   ub4 kccfhcsq                             @40       0x00000d3d
   ub4 kccfhfsz                             @44       0x00003200
   s_blkz kccfhbsz                          @48       0x00
   ub2 kccfhfno                             @52       0x0004
   ub2 kccfhtyp                             @54       0x0003
   ub4 kccfhacid                            @56       0x00000000
   ub4 kccfhcks                             @60       0x00000000
   text kccfhtag[0]                         @64       
 ....................    
sys@PROD> select name from v$dbfile where file#=5;
NAME
--------------------------------------------------
/u01/app/oracle/oradata/PROD/tp01.dbf
[oracle@jfdb PROD]$ ls -lFtr |grep tp01
-rw-r-----. 1 oracle oinstall  524296192 Jun  8 18:58 tp01.dbf
sys@PROD> select 524296192/8192 from dual;
524296192/8192
--------------
         64001

BBED> d /v offset 44
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:   44 to   63  Dba:0x01400001
-------------------------------------------------------
 00320000 00200000 04000300 00000000 l .2... ..........
 00000000 
BBED> m /x 00fa0000 44
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:   44 to   63           Dba:0x01400001
------------------------------------------------------------------------
 00fa0000 00200000 04000300 00000000 00000000

(3)修改文件号（4--->5）

ub2 kccfhfno @52 0x0004

BBED> d /v offset 52
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:   52 to   71  Dba:0x01400001
-------------------------------------------------------
 04000300 00000000 00000000 00000000 l ................
 00000000 
BBED> m /x 05 offset 52
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:   52 to   71           Dba:0x01400001
------------------------------------------------------------------------
 05000300 00000000 00000000 00000000 00000000

(4)修改文件创建时SCN

BBED> p kcvfhcrs
struct kcvfhcrs, 8 bytes                    @100     
   ub4 kscnbas                              @100      0x00004b14
   ub2 kscnwrp                              @104      0x0000
sys@PROD> select file#,CREATION_CHANGE# from v$datafile where file#=5;
     FILE# CREATION_CHANGE#
---------- ----------------
         5           363921
sys@PROD> select to_char('363921','xxxxxxxxxxxxx') from dual;
TO_CHAR('36392
--------------
         58d91   ===（倒：918d0500）==》00058d91
BBED> d /v offset 100
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  100 to  119  Dba:0x01400001
-------------------------------------------------------
 144b0000 00000000 30cf3e32 a41da532 l .K......0?>2¤.￥2
 ec4f1900
BBED> m /x 918d offset 100
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  100 to  119           Dba:0x01400001
------------------------------------------------------------------------
 918d0000 00000000 30cf3e32 a41da532 ec4f1900 
BBED>  m /x 0500 offset 102
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  102 to  121           Dba:0x01400001
------------------------------------------------------------------------
 05000000 000030cf 3e32a41d a532ec4f 19000000 
BBED> d /v offset 100
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  100 to  119  Dba:0x01400001
-------------------------------------------------------
 918d0500 00000000 30cf3e32 a41da532 l ........0?>2¤.￥2
 ec4f1900

(5)修改文件创建时间

ub4 kcvfhcrt                             @108      0x323ecf30
BBED> p kcvfhcrt
ub4 kcvfhcrt                                @108      0x323ecf30
sys@PROD> select file#,to_char(CREATION_TIME,'yyyy-mm-dd hh24:mi:ss') createTime,
  2      (to_char(CREATION_TIME,'yyyy')-1988)*12*31*24*3600+
  3       (to_char(CREATION_TIME,'mm')-1)*31*24*3600+
  4     (to_char(CREATION_TIME,'dd')-1)*24*3600+
  5     to_char(CREATION_TIME,'hh24')*3600+
  6     to_char(CREATION_TIME,'mi')*60+
  7     to_char(CREATION_TIME,'ss') createTimeSCN
  8    from v$datafile WHERE file# in(4,5);
     FILE# CREATETIME          CREATETIMESCN
---------- ------------------- -------------
         4 2014-03-23 16:17:52     842977072
         5 2014-03-29 10:32:22     843474742
sys@PROD> select '4' file#, to_char('842977072','xxxxxxxxxxxxxx') from dual;
F TO_CHAR('842977
- ---------------
4        323ecf30    ===>倒：30cf3e32
sys@PROD> select '5' file#,to_char('843474742','xxxxxxxxxxxxxx') from dual;
sys@PROD>  select '5' file#,to_char('843474742','xxxxxxxxxxxxxx') from dual;
F TO_CHAR('843474
- ---------------
5        32466736  ==》36674632
BBED> d /v offset 108
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  108 to  127  Dba:0x01400001
-------------------------------------------------------
 30cf3e32 a41da532 ec4f1900 00000000 l 0?>2¤.￥2ìO......
 d713a532
BBED> m /x 36674632 offset 108
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  108 to  127           Dba:0x01400001
------------------------------------------------------------------------
 36674632 a41da532 ec4f1900 00000000 d713a532

sword kcvfhtsn                           @332      4
sys@PROD> select file#,TS# from  v$datafile where file# in(4,5);
     FILE#        TS#
---------- ----------
         4          4
         5          5
BBED> d /v offset 332
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  332 to  351  Dba:0x01400001
-------------------------------------------------------
 04000000 05005553 45525300 00000000 l ......USERS.....
 00000000                            l ....
 <16 bytes per line>
BBED> m /x 05 offset 332
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  332 to  351           Dba:0x01400001
------------------------------------------------------------------------
 05000000 05005553 45525300 00000000 00000000

ub4 kcvfhrfn @368 0x00000004

BBED> d /v offset 368
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  368 to  387  Dba:0x01400001
-------------------------------------------------------
 04000000 00000000 00000000 00000000 l ................
 00000000                            l ....
 <16 bytes per line>
BBED> m /x 05 offset 368
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  368 to  387           Dba:0x01400001
------------------------------------------------------------------------
 05000000 00000000 00000000 00000000 00000000

BBED> p kcvfhtnm
text kcvfhtnm[0]                            @338     U
text kcvfhtnm[1]                            @339     S
text kcvfhtnm[2]                            @340     E
text kcvfhtnm[3]                            @341     R
text kcvfhtnm[4]                            @342     S
text kcvfhtnm[5]                            @343      
text kcvfhtnm[6]                            @344      
text kcvfhtnm[7]                            @345      
text kcvfhtnm[8]                            @346      
text kcvfhtnm[9]                            @347      
text kcvfhtnm[10]                           @348      
text kcvfhtnm[11]                           @349      
text kcvfhtnm[12]                           @350 
sys@PROD> select file#,TS# from  v$datafile where file# in(4,5);
     FILE#        TS#
---------- ----------
         4          4
         5          5
sys@PROD> select TS#,NAME from v$tablespace where ts# in(4,5);
       TS# NAME
---------- --------------------------------------------------
         4 USERS
         5 TP1
BBED> d /v offset 338
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  338 to  357  Dba:0x01400001
-------------------------------------------------------
 55534552 53000000 00000000 00000000 l USERS...........
 00000000
sys@PROD> select dump('USERS',16) from dual;
DUMP('USERS',16)
----------------------------
Typ=96 Len=5: 55,53,45,52,53
sys@PROD> select dump('TP1',16) from dual;
DUMP('TP1',16)
----------------------
Typ=96 Len=3: 54,50,31
BBED> m /x 54503100 offset 338
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  338 to  357           Dba:0x01400001
------------------------------------------------------------------------
 54503100 53000000 00000000 00000000 00000000 
 <32 bytes per line>
BBED> m /x 00 offset 342
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  342 to  361           Dba:0x01400001
------------------------------------------------------------------------
 00000000 00000000 00000000 00000000 00000000 
 <32 bytes per line>
BBED> d /v offset 338
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  338 to  357  Dba:0x01400001
-------------------------------------------------------
 54503100 00000000 00000000 00000000 l TP1.............
 00000000

ub2 kcvfhtln @336 0x0005

BBED> d /v offset 336
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  336 to  355  Dba:0x01400001
-------------------------------------------------------
 05005450 31000000 00000000 00000000 l ..TP1...........
 00000000                            l ....
 <16 bytes per line>
BBED> m /x 03 offset 336
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  336 to  355           Dba:0x01400001
------------------------------------------------------------------------
 03005450 31000000 00000000 00000000 00000000 
 <32 bytes per line>

(10)检查点

BBED> p kcvfhckp
struct kcvfhckp, 36 bytes                   @484     
   struct kcvcpscn, 8 bytes                 @484     
      ub4 kscnbas                           @484      0x0019b1a1   --->1683873
      ub2 kscnwrp                           @488      0x0000
   ub4 kcvcptim                             @492      0x32a59921   -->849713441
   ub2 kcvcpthr                             @496      0x0001
   union u, 12 bytes                        @500     
      struct kcvcprba, 12 bytes             @500     
         ub4 kcrbaseq                       @500      0x00000002
         ub4 kcrbabno                       @504      0x000002e0
         ub2 kcrbabof                       @508      0x0010
   ub1 kcvcpetb[0]                          @512      0x02
   ub1 kcvcpetb[1]                          @513      0x00
   ub1 kcvcpetb[2]                          @514      0x00
   ub1 kcvcpetb[3]                          @515      0x00
   ub1 kcvcpetb[4]                          @516      0x00
   ub1 kcvcpetb[5]                          @517      0x00
   ub1 kcvcpetb[6]                          @518      0x00
   ub1 kcvcpetb[7]                          @519      0x00
sys@PROD> select file#,rfile#,CREATION_TIME,checkpoint_change#,unrecoverable_change#,offline_change# from v$datafile;
     FILE#     RFILE# CREATION_ CHECKPOINT_CHANGE# UNRECOVERABLE_CHANGE# OFFLINE_CHANGE#
---------- ---------- --------- ------------------ --------------------- ---------------
         1          1 23-MAR-14            1683873                     0         1658859
         2          2 23-MAR-14            1683873                     0         1658859
         3          3 23-MAR-14            1683873                     0         1658859
         4          4 23-MAR-14            1683873                     0         1658859
         5          5 29-MAR-14            1684251                     0         1658859
sys@PROD> select to_number('19b1a1','xxxxxxxxxxxx') from dual;
TO_NUMBER('19B1A1','XXXXXXXXXXXX')
----------------------------------
                           1683873
sys@PROD> select to_number('32a59921','xxxxxxxxxxxx') from dual;
TO_NUMBER('32A59921','XXXXXXXXXXXX')
------------------------------------
                           849713441
sys@PROD> select file#,to_char(CHECKPOINT_TIME,'yyyy-mm-dd hh24:mi:ss') createTime,
  2    (to_char(CHECKPOINT_TIME,'yyyy')-1988)*12*31*24*3600+
  3     (to_char(CHECKPOINT_TIME,'mm')-1)*31*24*3600+
  4   (to_char(CHECKPOINT_TIME,'dd')-1)*24*3600+
  5   to_char(CHECKPOINT_TIME,'hh24')*3600+
  6    to_char(CHECKPOINT_TIME,'mi')*60+
  7   to_char(CHECKPOINT_TIME,'ss') createTimeSCN
  8    from v$datafile WHERE file# in(4,5);
     FILE# CREATETIME          CREATETIMESCN
---------- ------------------- -------------
         4 2014-06-08 15:30:41     849713441
         5 2014-06-08 15:38:33     849713913
sys@PROD> sys@PROD> select to_char('1684251','xxxxxxxxxxxxxxx') from dual;
TO_CHAR('1684251
----------------
          19b31b   ====>真正5号文件的检查点SCN
sys@PROD> select to_char('849713913','xxxxxxxxxxxxxxx') from dual;
TO_CHAR('8497139
----------------
        32a59af9  ====>真正5号文件的检查点时间
ub4 kscnbas                           @484      0x0019b1a1     ====>真正5号文件的检查点SCN 19b31b (倒：1bb319)
ub4 kcvcptim                          @492      0x32a59921     ====>真正5号文件的检查点时间32a59af9（倒：f99aa532）
BBED> d /v offset 484
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  484 to  503  Dba:0x01400001
-------------------------------------------------------
 a1b11900 00000000 2199a532 01000000 l ?±......!.￥2....
 02000000 
BBED> m /x 1bb319 offset 484
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  484 to  503           Dba:0x01400001
------------------------------------------------------------------------
 1bb31900 00000000 2199a532 01000000 02000000 
BBED> d /v offset 492
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  492 to  511  Dba:0x01400001
-------------------------------------------------------
 2199a532 01000000 02000000 e0020000 l !.￥2........à...
 10007261 
BBED> m /x f99a offset 492
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  492 to  511           Dba:0x01400001
------------------------------------------------------------------------
 f99aa532 01000000 02000000 e0020000 10007261

##################校验块

BBED> sum apply
Check value for File 5, Block 1:
current = 0x4a10, required = 0x4a10
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/PROD/tp01.dbf
BLOCK = 1
DBVERIFY - Verification complete
Total Blocks Examined         : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing   (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing   (Index): 0
Total Blocks Empty            : 0
Total Blocks Marked Corrupt   : 0
Total Blocks Influx           : 0
Message 531 not found;  product=RDBMS; facility=BBED

######################检查物理坏块

[oracle@jfdb PROD]$ dbv file=tp01.dbf start=1 end=2
DBVERIFY: Release 11.2.0.3.0 - Production on Sun Jun 8 21:48:37 2014
Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.
DBVERIFY - Verification starting : FILE = /u01/app/oracle/oradata/PROD/tp01.dbf
DBVERIFY - Verification complete
Total Pages Examined         : 2
Total Pages Processed (Data) : 0
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 2
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 0
Total Pages Marked Corrupt   : 0
Total Pages Influx           : 0
Total Pages Encrypted        : 0
Highest block SCN            : 1687542 (0.1687542)

############打开数据库报错

sys@PROD> shutdown abort;
ORACLE instance shut down.
sys@PROD> startup
ORACLE instance started.
Total System Global Area  939495424 bytes
Fixed Size                  2233960 bytes
Variable Size             251660696 bytes
Database Buffers          679477248 bytes
Redo Buffers                6123520 bytes
Database mounted.
ORA-01122: database file 5 failed verification check
ORA-01110: data file 5: '/u01/app/oracle/oradata/PROD/tp01.dbf'
ORA-01207: file is more recent than control file - old control file

###########怀疑检查点计数器，这里我先用BBED（方法1重建控制文件，方法2利用BBED修改计算器）

ub4 kcvfhcpc @140 0x00000102

idle> alter session set events 'immediate trace name controlf level 8';
Session altered.
DATA FILE #5: 
  name #4: /u01/app/oracle/oradata/PROD/tp01.dbf
creation size=0 block size=8192 status=0xe head=4 tail=4 dup=1
 tablespace 5, index=5 krfil=5 prev_file=0
 unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00
 Checkpoint cnt:226 scn: 0x0000.0019b31b 06/08/2014 15:38:33
 Stop scn: 0xffff.ffffffff 06/08/2014 07:44:07
 Creation Checkpointed at scn:  0x0000.00058d91 03/29/2014 10:32:22
 thread:0 rba:(0x0.0.0)
sys@PROD> select to_char('226','xxxxxxxxxxxxx') from dual;
TO_CHAR('226',
--------------
            e2
sys@PROD> select to_char('225','xxxxxxxxxxxxx') from dual;
TO_CHAR('225',
--------------
            e1
BBED> d /v offset 140
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  140 to  159  Dba:0x01400001
-------------------------------------------------------
 02010000 8bc6a532 01010000 b24f1900 l .....?￥2....2O..
 00000000 
BBED> m /x e200 offset 140
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  140 to  159           Dba:0x01400001
------------------------------------------------------------------------
 e2000000 8bc6a532 01010000 b24f1900 00000000 
 <32 bytes per line>
BBED> d /v offset 148
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1       Offsets:  148 to  167  Dba:0x01400001
-------------------------------------------------------
 01010000 b24f1900 00000000 d713a532 l ....2O......×.￥2
 01000000                            l ....
 <16 bytes per line>
BBED> m /x e100 offset 148
 File: /u01/app/oracle/oradata/PROD/tp01.dbf (5)
 Block: 1                Offsets:  148 to  167           Dba:0x01400001
------------------------------------------------------------------------
 e1000000 b24f1900 00000000 d713a532 01000000 
 <32 bytes per line>
BBED> sum apply
Check value for File 5, Block 1:
current = 0x4a10, required = 0x4a10
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle/oradata/PROD/tp01.dbf
BLOCK = 1
DBVERIFY - Verification complete
Total Blocks Examined         : 1
Total Blocks Processed (Data) : 0
Total Blocks Failing   (Data) : 0
Total Blocks Processed (Index): 0
Total Blocks Failing   (Index): 0
Total Blocks Empty            : 0
Total Blocks Marked Corrupt   : 0
Total Blocks Influx           : 0
Message 531 not found;  product=RDBMS; facility=BBED

##########再次打开库，OK!

sys@PROD> select status from v$instance;
STATUS
------------
MOUNTED
sys@PROD> alter database open;
Database altered.

###############################修改数据文件头的注意点：
1、修改数据的DBA,rdba_kcbh

2、修改文件的大小，kccfhfsz

3、修改文件号，kccfhfno

4、修改文件创建时SCN，kcvfhcrs

5、修改文件创建时间，kcvfhcrt

6、修改表空间号，kcvfhtsn

7、修改相对文件号，kcvfhrfn

8、修改表空间的名称， kcvfhtnm

9、修改表空间的长度，kcvfhtln

10、修改检查点的SCN，kcvfhckp

11、修改检查点的时间，kcvcptim

12、修改检查点的计数器，kcvfhcpc

13、修改检查点的控制文件备份的计数器， kcvfhccc

14、如果你修改是1号文件的1号块他的root rdba的地针是指向了bootstrap$

利用BBED恢复数据文件头

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