global_name为空导致的数据库不能open—使用BBED修复(bbed恢复update的数据)

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标题:global_name为空导致的数据库不能open—使用BBED修复(bbed恢复update的数据)

作者:Lunar©版权所有[文章允许转载,但必须以链接方式注明源地址,否则追究法律责任.]

GLOBAL_NAME和props$对象介绍
global_name为空导致的数据库不能open—–使用gdb修复(中断oracle启动的部分监测功能)
global_name为空导致的数据库不能open—–使用dd修复(使用dd拷贝块的方式)
global_name为空导致的数据库不能open—–使用DUL修复

这篇为第4种解决 global_name 为NULL导致数据库不能启动的方法—-本质是使用bbed来恢复update的值。
bbed的安装和配置,网上已经很多了,总的来说,就是12.1和11.2都使用10.2的bbed库进行编译,然后可以正常使用。
bbed的初始配置参考: BBED简介

即,使用BBED来直接修改一个block的数据的方法。这里将使用BBED将删除掉global_name值找回来。
注意: 这个方法实质就是使用BBED恢复一行被update的数据。

上次我们说过,很多方法都可以定位这个报错的数据块和global_name所在行的信息。
在中《global_name为空导致的数据库不能open—–使用DUL修复》,我们使用对比的方法。
这里,我们根据报错时生成的trace文件来定位这行报错的global_name在block中信息,然后使用bbed来修复。
首先,我们知道props$的数据存放在file 1 block 801中,那么转换存储地址为:

SYS@lunarp>select to_char(dbms_utility.make_data_block_address(1,801),'xxxxxxxxxxxxxxxxx') from dual;

TO_CHAR(DBMS_UTILI
------------------
            400321

Elapsed: 00:00:00.01
SYS@lunarp>

在bbed中验证一下,我们看到改块内共36行数据,这个信息在11.2的数据库中是固定的(缺省情况下,也就是没有手工修改时):

BBED> set file 1 block 801
        FILE#           1
        BLOCK#          801

BBED> p kdbh
struct kdbh, 14 bytes                       @92      
   ub1 kdbhflag                             @92       0x00 (NONE)
   sb1 kdbhntab                             @93       1
   sb2 kdbhnrow                             @94       36   该表有36行
   sb2 kdbhfrre                             @96      -1
   sb2 kdbhfsbo                             @98       90
   sb2 kdbhfseo                             @100      5852
   sb2 kdbhavsp                             @102      6040
   sb2 kdbhtosp                             @104      6040

BBED> 

那么,这行记录到底是第几行呢? 使用bbed的find自然是可以search到,不过这个方法感觉不清晰。
下面,我们在trace中,搜索“0×00400321”关键字,找到“Block header dump: 0×00400321”相关部分:

Block header dump:  0x00400321
 Object id on Block? Y
 seg/obj: 0x62  csc: 0x00.1a0169  itc: 2  flg: O  typ: 1 - DATA
     fsl: 0  fnx: 0x0 ver: 0x01
 
 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0007.006.00000346  0x00c00f60.00ad.31  --U-    1  fsc 0x0007.001a988c
0x02   0x0001.01a.00000322  0x00c00ee0.009b.0e  C---    0  scn 0x0000.0019b316
bdba: 0x00400321
data_block_dump,data header at 0x76fa205c
===============
tsiz: 0x1fa0
hsiz: 0x5a
pbl: 0x76fa205c
     76543210
flag=--------
ntab=1
nrow=36
frre=-1
fsbo=0x5a
fseo=0x16b4
avsp=0x1798
tosp=0x179f
0xe:pti[0]	nrow=36	offs=0
0x12:pri[0]	offs=0x1f70
0x14:pri[1]	offs=0x1e57
0x16:pri[2]	offs=0x1894
0x18:pri[3]	offs=0x1e9c
0x1a:pri[4]	offs=0x1e10
0x1c:pri[5]	offs=0x1dfb
0x1e:pri[6]	offs=0x1dd9
0x20:pri[7]	offs=0x1d98
0x22:pri[8]	offs=0x1d55
0x24:pri[9]	offs=0x1d0f
0x26:pri[10]	offs=0x1cd9
0x28:pri[11]	offs=0x1cb7
0x2a:pri[12]	offs=0x1c94
0x2c:pri[13]	offs=0x1c73
0x2e:pri[14]	offs=0x1c4a
0x30:pri[15]	offs=0x1c1a
0x32:pri[16]	offs=0x1bef
0x34:pri[17]	offs=0x1bc5
0x36:pri[18]	offs=0x1b9c
0x38:pri[19]	offs=0x1b70
0x3a:pri[20]	offs=0x1b47
0x3c:pri[21]	offs=0x1b19
0x3e:pri[22]	offs=0x1ad6
0x40:pri[23]	offs=0x1a93
0x42:pri[24]	offs=0x1a3c
0x44:pri[25]	offs=0x1a10
0x46:pri[26]	offs=0x19ee
0x48:pri[27]	offs=0x19bc
0x4a:pri[28]	offs=0x1986
0x4c:pri[29]	offs=0x194e
0x4e:pri[30]	offs=0x190d
0x50:pri[31]	offs=0x16b4
0x52:pri[32]	offs=0x1862
0x54:pri[33]	offs=0x1818
0x56:pri[34]	offs=0x179c
0x58:pri[35]	offs=0x1760

seg/obj: 0×62 转换成10进制是98,也就是对象号98(dba_objects.object_id=98),这个正式props$对象的object_id:
csc: 0×00.18c0ef –cleanoutSCN,块清除时的SCN
itc: 2 —ITLcount, ITL的数量
flg: O —Block is on free list (flg)
typ: 1 – DATA —-这里表示是数据块,定义如下:

接下来是ITL信息:

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x000a.01f.00000333  0x00c00995.00ac.2f  --U-    1  fsc 0x0005.0018c0f4
0x02   0x0003.00f.0000031e  0x00c007c8.00a5.05  C---    0  scn 0x0000.001052a5
bdba: 0x00400321
data_block_dump,data header at 0x76fa005c

这里面表示使用了2个ITL slot(跟上面itc: 2是对应的),每个ITL占用24 bytes。
Flag的含义:C是提交,U是快速提交,—是未提交。因此,这里表示没有活动事务,所有事物都已经commit
上述信息跟bbed的信息是吻合的:

BBED> p ktbbh
struct ktbbh, 72 bytes                      @20      
   ub1 ktbbhtyp                             @20       0x01 (KDDBTDATA)
   union ktbbhsid, 4 bytes                  @24      
      ub4 ktbbhsg1                          @24       0x00000062
      ub4 ktbbhod1                          @24       0x00000062
   struct ktbbhcsc, 8 bytes                 @28      
      ub4 kscnbas                           @28       0x001a0169
      ub2 kscnwrp                           @32       0x0000
   sb2 ktbbhict                             @36       2
   ub1 ktbbhflg                             @38       0x03 (KTBFONFL)
   ub1 ktbbhfsl                             @39       0x00
   ub4 ktbbhfnx                             @40       0x00000000
   struct ktbbhitl[0], 24 bytes             @44      
      struct ktbitxid, 8 bytes              @44      
         ub2 kxidusn                        @44       0x0007
         ub2 kxidslt                        @46       0x0006
         ub4 kxidsqn                        @48       0x00000346
      struct ktbituba, 8 bytes              @52      
         ub4 kubadba                        @52       0x00c00f60   -----第1个ITL使用的undo block地址
         ub2 kubaseq                        @56       0x00ad
         ub1 kubarec                        @58       0x31         ------undo record#
      ub2 ktbitflg                          @60       0x2001 (KTBFUPB)   ------
      union _ktbitun, 2 bytes               @62      
         sb2 _ktbitfsc                      @62       7
         ub2 _ktbitwrp                      @62       0x0007
      ub4 ktbitbas                          @64       0x001a988c  -----对应于fsc(fsc 0x0005.0018c0f4 )
   struct ktbbhitl[1], 24 bytes             @68      
      struct ktbitxid, 8 bytes              @68      
         ub2 kxidusn                        @68       0x0001
         ub2 kxidslt                        @70       0x001a
         ub4 kxidsqn                        @72       0x00000322
      struct ktbituba, 8 bytes              @76      
         ub4 kubadba                        @76       0x00c00ee0   -----第2个ITL使用的undo block地址
         ub2 kubaseq                        @80       0x009b
         ub1 kubarec                        @82       0x0e         ------undo record#
      ub2 ktbitflg                          @84       0x8000 (KTBFCOM)  ------表示事物已经提交
      union _ktbitun, 2 bytes               @86      
         sb2 _ktbitfsc                      @86       0
         ub2 _ktbitwrp                      @86       0x0000
      ub4 ktbitbas                          @88       0x0019b316

BBED> 

使用dump函数可以看到GLOBAL_DB_NAME的16进制形式是:47 4c 4f 42 41 4c 5f 44 42 5f 4e 41 4d 45

按照关键字“47 4c 4f 42 41 4c 5f 44 42 5f 4e 41 4d 45” 搜索trace文件,可以看到:

tab 0, row 31, @0x16b4   -------》表示: 第1张表,第32行(从0开始编号)数据,块内偏移量为:5812 bytes
tl: 40 fb: --H-FL-- lb: 0x1  cc: 3
col  0: [14]  47 4c 4f 42 41 4c 5f 44 42 5f 4e 41 4d 45
col  1: *NULL*
col  2: [20]  47 6c 6f 62 61 6c 20 64 61 74 61 62 61 73 65 20 6e 61 6d 65

我们来证实一下,是不是这样数据。
这里显示global_name对应的是第32行数据(一个block中的数据行是从0开始编号的)。
我们证实一下,首先,这里col 0:

SYS@lunarp>select utl_raw.cast_to_varchar2(replace('47 4c 4f 42 41 4c 5f 44 42 5f 4e 41 4d 45',' ','')) from dual;

UTL_RAW.CAST_TO_VARCHAR2(REPLACE('474C4F42414C5F44425F4E414D45','',''))
------------------------------------------------------------------------------------------------------------------------------------------------------
GLOBAL_DB_NAME

Elapsed: 00:00:00.01
SYS@lunarp>

col 1 这个是第二列,value$的值,被update为空值了。
col 2:
SYS@lunarp>select utl_raw.cast_to_varchar2(replace('47 6c 6f 62 61 6c 20 64 61 74 61 62 61 73 65 20 6e 61 6d 65',' ','')) from dual;

UTL_RAW.CAST_TO_VARCHAR2(REPLACE('476C6F62616C206461746162617365206E616D65','',''))
------------------------------------------------------------------------------------------------------------------------------------------------------
Global database name

Elapsed: 00:00:00.01
SYS@lunarp>

可以看到,跟我们前面看到的是一致的:

SYS@lunarp>select * from props$ where name = 'GLOBAL_DB_NAME';

NAME                           VALUE$                         COMMENT$
------------------------------ ------------------------------ --------------------------------------------------
GLOBAL_DB_NAME                                                Global database name

Elapsed: 00:00:00.01
SYS@lunarp>

那么这行数据在块内偏移量:
SYS@lunarp>select to_number(’16b4′,’xxxxxxxxxxxx’) from dual;

TO_NUMBER(’16b4′,’XXXXXXXXXXXX’)
——————————–
5812

Elapsed: 00:00:00.00
SYS@lunarp>

普通行头:ROW_HEAD_PIECE + ROW_FIRST_PIECE + ROW_LAST_PIECE= 0×20 + 0×08 + 0×04= 0x2c 转换成10进制就是44
第32行记录的实际位置应该是:5812+44+2*24=5904

BBED> d /v offset 5908 count 128
File: /stage/lunar/system01.dbf (1)
Block: 801 Offsets: 5908 to 6035 Dba:0×00400321
——————————————————-
474c4f42 414c5f44 425f4e41 4d45ff14 l GLOBAL_DB_NAME..
476c6f62 616c2064 61746162 61736520 l Global database
6e616d65 2c00030e 474c4f42 414c5f44 l name,…GLOBAL_D
425f4e41 4d45076c 756e6172 62621447 l B_NAME.lunarbb.G
6c6f6261 6c206461 74616261 7365206e l lobal database n
616d652c 00030e47 4c4f4241 4c5f4442 l ame,…GLOBAL_DB
5f4e414d 45ff1447 6c6f6261 6c206461 l _NAME..Global da
74616261 7365206e 616d652c 00030e47 l tabase name,…G

<16 bytes per line>

BBED>

查看第32行数据(从第0行开始编号):
BBED> p *kdbr[31]
rowdata[0]
———-
ub1 rowdata[0] @5904 0x2c

BBED> x /rccccccccc
rowdata[0] @5904
———-
flag@5904: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@5905: 0×01
cols@5906: 3

col 0[14] @5907: GLOBAL_DB_NAME
col 1[0] @5922: *NULL*
col 2[20] @5923: Global database name

BBED>
[/shell]
可以看到,信息都是对的,GLOBAL_NAME的值是*NULL*,表示已经被清空了。

现在我们需要找到update之前的值。在block中按照GLOBAL_DB_NAME关键字检索,因为我使用多个方法分别update了多次,因此我这里搜索出来5次:

BBED> find /c GLOBAL_DB_NAME
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets: 5908 to 6035           Dba:0x00400321
------------------------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45ff14 476c6f62 616c2064 61746162 61736520 
 6e616d65 2c00030e 474c4f42 414c5f44 425f4e41 4d45076c 756e6172 62621447 
 6c6f6261 6c206461 74616261 7365206e 616d652c 00030e47 4c4f4241 4c5f4442 
 5f4e414d 45ff1447 6c6f6261 6c206461 74616261 7365206e 616d652c 00030e47 

 <32 bytes per line>

BBED> f
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets: 5948 to 6075           Dba:0x00400321
------------------------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45076c 756e6172 62621447 6c6f6261 6c206461 
 74616261 7365206e 616d652c 00030e47 4c4f4241 4c5f4442 5f4e414d 45ff1447 
 6c6f6261 6c206461 74616261 7365206e 616d652c 00030e47 4c4f4241 4c5f4442 
 5f4e414d 45054c55 4e415214 476c6f62 616c2064 61746162 61736520 6e616d65 

 <32 bytes per line>

BBED> f
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets: 5995 to 6122           Dba:0x00400321
------------------------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45ff14 476c6f62 616c2064 61746162 61736520 
 6e616d65 2c00030e 474c4f42 414c5f44 425f4e41 4d45054c 554e4152 14476c6f 
 62616c20 64617461 62617365 206e616d 652c0002 174e4f5f 55534552 49445f56 
 45524946 4945525f 53414c54 20364135 38323032 41303638 42363738 42303943 

 <32 bytes per line>

BBED> f
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets: 6035 to 6162           Dba:0x00400321
------------------------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45054c 554e4152 14476c6f 62616c20 64617461 
 62617365 206e616d 652c0002 174e4f5f 55534552 49445f56 45524946 4945525f 
 53414c54 20364135 38323032 41303638 42363738 42303943 46353731 44433936 
 37463345 432c0003 14574f52 4b4c4f41 445f5245 504c4159 5f4d4f44 45ff6250 

 <32 bytes per line>

BBED> f
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets: 6463 to 6590           Dba:0x00400321
------------------------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d450654 52415645 4c14476c 6f62616c 20646174 
 61626173 65206e61 6d652c00 03114e4c 535f5244 424d535f 56455253 494f4e0a 
 31312e32 2e302e33 2e302052 44424d53 20766572 73696f6e 20666f72 204e4c53 
 20706172 616d6574 6572732c 0003164e 4c535f4e 43484152 5f434841 52414354 

 <32 bytes per line>

BBED> f
BBED-00212: search string not found

为了看得更清晰,我们看看这5次搜索到的具体的内容:

看一下上述5次修改的值分别是什么:

BBED> d /v offset 5908 count 100
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 5908 to 6007  Dba:0x00400321
-------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45ff14 l GLOBAL_DB_NAME..   
 476c6f62 616c2064 61746162 61736520 l Global database 
 6e616d65 2c00030e 474c4f42 414c5f44 l name,...GLOBAL_D   ------ 2c00030e =======》行头  行起始的offset:5944
 425f4e41 4d45076c 756e6172 62621447 l B_NAME.lunarbb.G   
 6c6f6261 6c206461 74616261 7365206e l lobal database n
 616d652c 00030e47 4c4f4241 4c5f4442 l ame,...GLOBAL_DB
 5f4e414d                            l _NAM

 <16 bytes per line>

BBED> d /v offset 5948 count 100
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 5948 to 6047  Dba:0x00400321
-------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45076c l GLOBAL_DB_NAME.l   ----- 474c4f42 414c5f44 425f4e41 4d45 ====>GLOBAL_DB_NAME
 756e6172 62621447 6c6f6261 6c206461 l unarbb.Global da   ------- 6c 756e6172 6262 =========> lunarbb 
 74616261 7365206e 616d652c 00030e47 l tabase name,...G   ----- 47 6c6f6261 6c206461 74616261 7365206e 616d65 =====》 Global database name
 4c4f4241 4c5f4442 5f4e414d 45ff1447 l LOBAL_DB_NAME..G   --- 2c 00030e  =========>行头   行起始的offset:5991
 6c6f6261 6c206461 74616261 7365206e l lobal database n
 616d652c 00030e47 4c4f4241 4c5f4442 l ame,...GLOBAL_DB
 5f4e414d                            l _NAM

 <16 bytes per line>

BBED> d /v offset 5995 count 100
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 5995 to 6094  Dba:0x00400321
-------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45ff14 l GLOBAL_DB_NAME..
 476c6f62 616c2064 61746162 61736520 l Global database 
 6e616d65 2c00030e 474c4f42 414c5f44 l name,...GLOBAL_D
 425f4e41 4d45054c 554e4152 14476c6f l B_NAME.LUNAR.Glo
 62616c20 64617461 62617365 206e616d l bal database nam
 652c0002 174e4f5f 55534552 49445f56 l e,...NO_USERID_V
 45524946                            l ERIF

 <16 bytes per line>

BBED> d /v offset 6035 count 100
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 6035 to 6134  Dba:0x00400321
-------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d45054c l GLOBAL_DB_NAME.L  
 554e4152 14476c6f 62616c20 64617461 l UNAR.Global data  
 62617365 206e616d 652c0002 174e4f5f l base name,...NO_  ---- 476c6f 62616c20 64617461 62617365 206e616d 65  =====》 Global database name
 55534552 49445f56 45524946 4945525f l USERID_VERIFIER_   ----- 2c0002 17   =========>行头   行起始的offset:6076
 53414c54 20364135 38323032 41303638 l SALT 6A58202A068
 42363738 42303943 46353731 44433936 l B678B09CF571DC96
 37463345                            l 7F3E

 <16 bytes per line>

BBED> d /v offset 6463 count 100
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 6463 to 6562  Dba:0x00400321
-------------------------------------------------------
 474c4f42 414c5f44 425f4e41 4d450654 l GLOBAL_DB_NAME.T
 52415645 4c14476c 6f62616c 20646174 l RAVEL.Global dat
 61626173 65206e61 6d652c00 03114e4c l abase name,...NL
 535f5244 424d535f 56455253 494f4e0a l S_RDBMS_VERSION.
 31312e32 2e302e33 2e302052 44424d53 l 11.2.0.3.0 RDBMS
 20766572 73696f6e 20666f72 204e4c53 l  version for NLS
 20706172                            l  par

 <16 bytes per line>

BBED> 

当前row[31]的信息如下:

BBED> p kdbr[31]
sb2 kdbr[31]                                @172      5812

BBED> p *kdbr[31]
rowdata[0]
----------
ub1 rowdata[0]                              @5904     0x2c

BBED> x /rccccccccccccccc
rowdata[0]                                  @5904    
----------
flag@5904: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@5905: 0x01
cols@5906:    3

col   0[14] @5907: GLOBAL_DB_NAME
col    1[0] @5922: *NULL*
col   2[20] @5923: Global database name

上面5次的详细信息:

BBED> d /v offset 5904 count 100  
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 5904 to 6003  Dba:0x00400321
-------------------------------------------------------
 2c01030e 474c4f42 414c5f44 425f4e41 l ,...GLOBAL_DB_NA    --- 2c01030e  =========>行头
 4d45ff14 476c6f62 616c2064 61746162 l ME..Global datab    ---- global_name=NULL
 61736520 6e616d65 2c00030e 474c4f42 l ase name,...GLOB    --- 2c01030e  =========>行头 offset 5944
 414c5f44 425f4e41 4d45076c 756e6172 l AL_DB_NAME.lunar    ---- global_name=lunarbb 
 62621447 6c6f6261 6c206461 74616261 l bb.Global databa
 7365206e 616d652c 00030e47 4c4f4241 l se name,...GLOBA
 4c5f4442                            l L_DB

 <16 bytes per line>

BBED> dump /v offset 5944
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 5944 to 6043  Dba:0x00400321    
-------------------------------------------------------
 2c00030e 474c4f42 414c5f44 425f4e41 l ,...GLOBAL_DB_NA   ----- 2c01030e  =========>行头  offset 5944
 4d45076c 756e6172 62621447 6c6f6261 l ME.lunarbb.Globa   ---- global_name=lunarbb 
 6c206461 74616261 7365206e 616d652c l l database name,
 00030e47 4c4f4241 4c5f4442 5f4e414d l ...GLOBAL_DB_NAM
 45ff1447 6c6f6261 6c206461 74616261 l E..Global databa
 7365206e 616d652c 00030e47 4c4f4241 l se name,...GLOBA
 4c5f4442                            l L_DB

 <16 bytes per line>

BBED> dump /v offset 5991
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 5991 to 6090  Dba:0x00400321
-------------------------------------------------------
 2c00030e 474c4f42 414c5f44 425f4e41 l ,...GLOBAL_DB_NA  ---- 2c01030e  =========>行头  offset 5991
 4d45ff14 476c6f62 616c2064 61746162 l ME..Global datab  ---- global_name=NULL
 61736520 6e616d65 2c00030e 474c4f42 l ase name,...GLOB  ---- 2c01030e  =========>行头  offset 6031
 414c5f44 425f4e41 4d45054c 554e4152 l AL_DB_NAME.LUNAR  ---- global_name=NULL
 14476c6f 62616c20 64617461 62617365 l .Global database
 206e616d 652c0002 174e4f5f 55534552 l  name,...NO_USER
 49445f56                            l ID_V

 <16 bytes per line>

BBED> dump /v offset 6031
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets: 6031 to 6130  Dba:0x00400321
-------------------------------------------------------
 2c00030e 474c4f42 414c5f44 425f4e41 l ,...GLOBAL_DB_NA     ---- 2c01030e  =========>行头  offset 6031
 4d45054c 554e4152 14476c6f 62616c20 l ME.LUNAR.Global     ---- global_name=LUNAR
 64617461 62617365 206e616d 652c0002 l database name,..
 174e4f5f 55534552 49445f56 45524946 l .NO_USERID_VERIF
 4945525f 53414c54 20364135 38323032 l IER_SALT 6A58202
 41303638 42363738 42303943 46353731 l A068B678B09CF571
 44433936                            l DC96

 <16 bytes per line>

BBED> 

我们可以选择这行数据指向6031(GLOBAL_DB_NAME.LUNAR),也可以选择这行数据指向5944(GLOBAL_DB_NAME.lunarbb)。
这里,我们选择将global_name修改会LUNAR,也就是将global_name还原为update之前的为LUNAR值。


现在我们把 *kdbr[31](即 rowdata的指针)的指针指向 offset 6031:
由于kdbr[31]和*kdbr[30]之间的差为92:*kdbr[31]的offset-kdbr[31]的offset=5904-5812=92
因此,要想*kdbr[31]指向6031,需要将kdbr[31]的值改为: 6031-92=5939(16进制为1733,考虑linux的倒序,实际修改时应该是3317)
修改前:

BBED> p kdbr[31]
sb2 kdbr[31]                                @172      5812  

BBED> p *kdbr[31]
rowdata[0]
----------
ub1 rowdata[0]                              @5904     0x2c

BBED> x /rccccccccccccccc
rowdata[0]                                  @5904    
----------
flag@5904: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@5905: 0x01 
cols@5906:    3

col   0[14] @5907: GLOBAL_DB_NAME
col    1[0] @5922: *NULL*
col   2[20] @5923: Global database name

BBED> set offset 172
        OFFSET          172

BBED> dump
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets:  172 to  271           Dba:0x00400321
------------------------------------------------------------------------
 b4166218 18189c17 60170000 00000000 00000000 00000000 00000000 00000000 
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
 00000000 

 <32 bytes per line>

BBED> 

——5812转换成16进制是16B4,linux是little endian,因此offset中实际上是保存了b416,也就是指向了b416这个位置
修改后:

BBED> modify /x 3317 offset 172
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets:  172 to  271           Dba:0x00400321
------------------------------------------------------------------------
 33176218 18189c17 60170000 00000000 00000000 00000000 00000000 00000000 
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
 00000000 

 <32 bytes per line>

BBED> dump /v offset 172
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets:  172 to  271  Dba:0x00400321
-------------------------------------------------------
 33176218 18189c17 60170000 00000000 l 3.b.....`.......
 00000000 00000000 00000000 00000000 l ................
 00000000 00000000 00000000 00000000 l ................
 00000000 00000000 00000000 00000000 l ................
 00000000 00000000 00000000 00000000 l ................
 00000000 00000000 00000000 00000000 l ................
 00000000                            l ....

 <16 bytes per line>

BBED> p kdbr[31]
sb2 kdbr[31]                                @172      5939

BBED> p *kdbr[31]
rowdata[127]
------------
ub1 rowdata[127]                            @6031     0x2c

BBED> x /rccccccccccc
rowdata[127]                                @6031    
------------
flag@6031: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@6032: 0x00   
cols@6033:    3

col   0[14] @6034: GLOBAL_DB_NAME
col    1[5] @6049: LUNAR
col   2[20] @6055: Global database name


BBED> sum apply
Check value for File 1, Block 801:
current = 0x93f1, required = 0x93f1

验证报错:kdbchk: xaction header lock count mismatch

BBED> verify
DBVERIFY - Verification starting
FILE = /stage/lunar/system01.dbf
BLOCK = 801

Block Checking: DBA = 4195105, Block Type = KTB-managed data block
data header at 0xf3465c
kdbchk: xaction header lock count mismatch
        trans=1 ilk=1 nlo=0
Block 801 failed with check code 6108

DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing   (Data) : 1
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


BBED> 

这里的错误信息“kdbchk: xaction header lock count mismatch”,对比修改前后的lock信息,就知道应该修改lock值:

BBED> modify /x 01 offset  6032
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets: 6032 to 6131           Dba:0x00400321
------------------------------------------------------------------------
 01030e47 4c4f4241 4c5f4442 5f4e414d 45054c55 4e415214 476c6f62 616c2064 
 61746162 61736520 6e616d65 2c000217 4e4f5f55 53455249 445f5645 52494649 
 45525f53 414c5420 36413538 32303241 30363842 36373842 30394346 35373144 
 43393637 

 <32 bytes per line>

BBED> sum apply
Check value for File 1, Block 801:
current = 0x93f0, required = 0x93f0

BBED> verify
DBVERIFY - Verification starting
FILE = /stage/lunar/system01.dbf
BLOCK = 801

Block Checking: DBA = 4195105, Block Type = KTB-managed data block
data header at 0xf3465c
kdbchk: the amount of space used is not equal to block size
        used=2054 fsc=7 avsp=6040 dtl=8096
Block 801 failed with check code 6110

DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing   (Data) : 1
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


BBED> 

这里报错信息为空间计算(修改可用空间,及其开始偏移量及其结束偏移量):
used+fsc+avsp=2054+7+6040=8101 ,已经大于dtl(8096)了
8101-8086=5
修改 ktbbhitl[1].b2 _ktbitfsc 值为 0就可以了:

修改前:

BBED> p ktbbhitl[0]
struct ktbbhitl[0], 24 bytes                @44      
   struct ktbitxid, 8 bytes                 @44      
      ub2 kxidusn                           @44       0x0007
      ub2 kxidslt                           @46       0x0006
      ub4 kxidsqn                           @48       0x00000346
   struct ktbituba, 8 bytes                 @52      
      ub4 kubadba                           @52       0x00c00f60
      ub2 kubaseq                           @56       0x00ad
      ub1 kubarec                           @58       0x31
   ub2 ktbitflg                             @60       0x2001 (KTBFUPB)
   union _ktbitun, 2 bytes                  @62      
      sb2 _ktbitfsc                         @62       7 ================需要将这里修改为0
      ub2 _ktbitwrp                         @62       0x0007
   ub4 ktbitbas                             @64       0x001a988c

修改:

BBED> dump /v offset 102 count 8
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets:  102 to  109  Dba:0x00400321
-------------------------------------------------------
 98179f17 00002400                   l ......$.

 <16 bytes per line>

BBED> dump /v offset 104 count 8
 File: /stage/lunar/system01.dbf (1)
 Block: 801     Offsets:  104 to  111  Dba:0x00400321
-------------------------------------------------------
 9f170000 2400701f                   l ....$.p.

 <16 bytes per line>

BBED> modify /x 00 offset 62
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets:   62 to   69           Dba:0x00400321
------------------------------------------------------------------------
 00008c98 1a000100 

 <32 bytes per line>

BBED> sum apply
Check value for File 1, Block 801:
current = 0x93f7, required = 0x93f7

BBED> p ktbbhitl
struct ktbbhitl[0], 24 bytes                @44      
   struct ktbitxid, 8 bytes                 @44      
      ub2 kxidusn                           @44       0x0007
      ub2 kxidslt                           @46       0x0006
      ub4 kxidsqn                           @48       0x00000346
   struct ktbituba, 8 bytes                 @52      
      ub4 kubadba                           @52       0x00c00f60
      ub2 kubaseq                           @56       0x00ad
      ub1 kubarec                           @58       0x31
   ub2 ktbitflg                             @60       0x2001 (KTBFUPB)
   union _ktbitun, 2 bytes                  @62      
      sb2 _ktbitfsc                         @62       0
      ub2 _ktbitwrp                         @62       0x0000
   ub4 ktbitbas                             @64       0x001a988c
struct ktbbhitl[1], 24 bytes                @68      
   struct ktbitxid, 8 bytes                 @68      
      ub2 kxidusn                           @68       0x0001
      ub2 kxidslt                           @70       0x001a
      ub4 kxidsqn                           @72       0x00000322
   struct ktbituba, 8 bytes                 @76      
      ub4 kubadba                           @76       0x00c00ee0
      ub2 kubaseq                           @80       0x009b
      ub1 kubarec                           @82       0x0e
   ub2 ktbitflg                             @84       0x8000 (KTBFCOM)
   union _ktbitun, 2 bytes                  @86      
      sb2 _ktbitfsc                         @86       0
      ub2 _ktbitwrp                         @86       0x0000
   ub4 ktbitbas                             @88       0x0019b316

BBED> 

报错:the amount of space used is not equal to block size 这个很好解决:

BBED> verify
DBVERIFY - Verification starting
FILE = /stage/lunar/system01.dbf
BLOCK = 801

Block Checking: DBA = 4195105, Block Type = KTB-managed data block
data header at 0xf5665c
kdbchk: the amount of space used is not equal to block size
        used=2054 fsc=0 avsp=6040 dtl=8096
Block 801 failed with check code 6110

DBVERIFY - Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 1
Total Blocks Failing   (Data) : 1
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


BBED> p kdbh
struct kdbh, 14 bytes                       @92      
   ub1 kdbhflag                             @92       0x00 (NONE)
   sb1 kdbhntab                             @93       1
   sb2 kdbhnrow                             @94       36
   sb2 kdbhfrre                             @96      -1
   sb2 kdbhfsbo                             @98       90
   sb2 kdbhfseo                             @100      5812
   sb2 kdbhavsp                             @102      6040
   sb2 kdbhtosp                             @104      6047

BBED> 

2054+6040=8094 因此修改kdbhavsp和kdbhtosp为6042(16进制是179A,考虑到小字节序,修改的值为9a17)
modify /x 9a17 offset 102
modify /x 9a17 offset 104

BBED> modify /x 9a17 offset 102
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets:  102 to  109           Dba:0×00400321
————————————————————————
 9a179f17 00002400 

 <32 bytes per line>

BBED> modify /x 9a17 offset 104
 File: /stage/lunar/system01.dbf (1)
 Block: 801              Offsets:  104 to  111           Dba:0×00400321
————————————————————————
 9a170000 2400701f 

 <32 bytes per line>

BBED> sum apply
Check value for File 1, Block 801:
current = 0x93f0, required = 0x93f0

BBED> verify
DBVERIFY – Verification starting
FILE = /stage/lunar/system01.dbf
BLOCK = 801


DBVERIFY – Verification complete

Total Blocks Examined         : 1
Total Blocks Processed (Data) : 1
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

BBED> p kdbh
struct kdbh, 14 bytes                       @92      
   ub1 kdbhflag                             @92       0×00 (NONE)
   sb1 kdbhntab                             @93       1
   sb2 kdbhnrow                             @94       36
   sb2 kdbhfrre                             @96      -1
   sb2 kdbhfsbo                             @98       90
   sb2 kdbhfseo                             @100      5812
   sb2 kdbhavsp                             @102      6042
   sb2 kdbhtosp                             @104      6042

BBED> 

都改好了,现在启动数据库,ok了:

SYS@lunarp>startup
Welcome Lunar's oracle world!

Love you , baby !

ORACLE instance started.

Total System Global Area  626327552 bytes
Fixed Size                  2230952 bytes
Variable Size             243271000 bytes
Database Buffers          373293056 bytes
Redo Buffers                7532544 bytes
Database mounted.
Welcome Lunar's oracle world!

Love you , baby !

Database opened.
SYS@lunarp>
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