06 使用bbed修复delete的数据--01

06 使用bbed修复delete的数据--01

根据rowid查看数据文件和block号

SYS@ orcl >select rowid,id,name,DBMS_ROWID.ROWID_RELATIVE_FNO(rowid) file#,DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid) block# from test.t1 where id=1;

ROWID               ID NAME                              FILE#    BLOCK#
------------------ ---------- -------------------------------------------------- ---------- ----------
AAAVVFAAFAAAAiOAAA        1 AAAAA                              5      2190

使用dump命令查看

SYS@ orcl >alter system dump datafile 5 block 2190;
System altered.
SYS@ orcl >select * from v$diag_info;
[root@DSI ~]# more /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_3081.trc
*** 2019-05-27 15:48:20.883
*** SESSION ID:(125.5) 2019-05-27 15:48:20.883
*** CLIENT ID:() 2019-05-27 15:48:20.883
*** SERVICE NAME:(SYS$USERS) 2019-05-27 15:48:20.883
*** MODULE NAME:(sqlplus@DSI (TNS V1-V3)) 2019-05-27 15:48:20.883
*** ACTION NAME:() 2019-05-27 15:48:20.883
 
kwqmnich: current time::  7: 48: 20: 0
kwqmnich: instance no 0 repartition flag 1 
kwqmnich: initialized job cache structure 
Start dump data blocks tsn: 5 file#:5 minblk 2190 maxblk 2190

*** 2019-05-29 16:15:55.111
Block dump from cache:
Dump of buffer cache at level 4 for tsn=5 rdba=20973710
BH (0x7e7dcdc8) file#: 5 rdba: 0x0140088e (5/2190) class: 1 ba: 0x7e4b6000
  set: 5 pool: 3 bsz: 8192 bsi: 0 sflg: 1 pwc: 70,28
  dbwrid: 0 obj: 87365 objn: 87365 tsn: 5 afn: 5 hint: f
  hash: [0x8d5a4700,0x8d5a4700] lru: [0x7e7dcd80,0x7f7dcc48]
  ckptq: [NULL] fileq: [NULL] objq: [0x7e7dcda8,0x885b38e0] objaq: [0x7e7dcdb8,0x885b38d0]
  st: XCURRENT md: NULL fpin: 'kdswh01: kdstgr' tch: 4
  flags: only_sequential_access
  LRBA: [0x0.0.0] LSCN: [0x0.0] HSCN: [0xffff.ffffffff] HSUB: [65535]
Block dump from disk:
buffer tsn: 5 rdba: 0x0140088e (5/2190)
scn: 0x0000.008dcadb seq: 0x02 flg: 0x06 tail: 0xcadb0602
frmt: 0x02 chkval: 0x5956 type: 0x06=trans data
Hex dump of block: st=0, typ_found=1
Dump of memory from 0x00007FC3EFE12200 to 0x00007FC3EFE14200
7FC3EFE12200 0000A206 0140088E 008DCADB 06020000  [......@.........]
7FC3EFE12210 00005956 00000001 00015545 008DCAC7  [VY......EU......]
7FC3EFE12220 00000000 00320002 01400888 000D0001  [......2...@.....]
7FC3EFE12230 000043A9 00C001B0 0029010D 00002001  [.C........).. ..]
7FC3EFE12240 008DCAC8 001B0004 000043A8 00C1973B  [.........C..;...]
7FC3EFE12250 00340115 00002001 008DCADB 00000000  [..4.. ..........]
7FC3EFE12260 00000000 00020100 0016FFFF 1F5A1F70  [............p.Z.]
7FC3EFE12270 00001F5A 1F840002 00001F70 00000000  [Z.......p.......]
7FC3EFE12280 00000000 00000000 00000000 00000000  [................]
        Repeat 500 times
7FC3EFE141D0 00000000 0203022C 620503C1 62626262  [....,......bbbbb]
7FC3EFE141E0 05777807 1B1C0F16 0203012C 410502C1  [.xw.....,......A]
7FC3EFE141F0 41414141 05777807 291B0F16 CADB0602  [AAAA.xw....)....]
Block header dump:  0x0140088e
 Object id on Block? Y
 seg/obj: 0x15545  csc: 0x00.8dcac7  itc: 2  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x1400888 ver: 0x01 opc: 0
     inc: 0  exflg: 0
 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0001.00d.000043a9  0x00c001b0.010d.29  --U-    1  fsc 0x0000.008dcac8
0x02   0x0004.01b.000043a8  0x00c1973b.0115.34  --U-    1  fsc 0x0000.008dcadb
bdba: 0x0140088e
data_block_dump,data header at 0x7fc3efe12264
===============
tsiz: 0x1f98
hsiz: 0x16
pbl: 0x7fc3efe12264
     76543210
flag=--------
ntab=1
nrow=2
frre=-1
fsbo=0x16
fseo=0x1f70
avsp=0x1f5a
tosp=0x1f5a
0xe:pti[0]    nrow=2    offs=0
0x12:pri[0]    offs=0x1f84
0x14:pri[1]    offs=0x1f70
block_row_dump:
tab 0, row 0, @0x1f84 ##具体的数据
tl: 20 fb: --H-FL-- lb: 0x1  cc: 3
col  0: [ 2]  c1 02
col  1: [ 5]  41 41 41 41 41
col  2: [ 7]  78 77 05 16 0f 1b 29
tab 0, row 1, @0x1f70
tl: 20 fb: --H-FL-- lb: 0x2  cc: 3

使用bbed进行查看

BBED> set file 5 block 2190
    FILE#              5
    BLOCK#             2190
BBED> map /v
BBED> p ktbbh
BBED> p kdbh
struct kdbh, 14 bytes                       @100     
   ub1 kdbhflag                             @100      0x00 (NONE)
   sb1 kdbhntab                             @101      1
   sb2 kdbhnrow                             @102      2
   sb2 kdbhfrre                             @104     -1
   sb2 kdbhfsbo                             @106      22
   sb2 kdbhfseo                             @108      8048
   sb2 kdbhavsp                             @110      8026
   sb2 kdbhtosp                             @112      8026

BBED> p kdbr 
sb2 kdbr[0]                                 @118      8068
sb2 kdbr[1]                                 @120      8048
BBED> p *kdbr[0]
rowdata[20]
-----------
ub1 rowdata[20]                             @8168     0x2c
BBED> x/rnccccc  ##对应行的值
rowdata[20]                                 @8168    
-----------
flag@8168: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8169: 0x01
cols@8170:    3

col    0[2] @8171: 1 
col    1[5] @8174: AAAAA
col    2[7] @8180: xw....)

SYS@ orcl >select dump(1,'16') from dual;

DUMP(1,'16')
-----------------
Typ=2 Len=2: c1,2
SYS@ orcl >select dump('AAAAA','16') from dual;

DUMP('AAAAA','16')
----------------------------
Typ=96 Len=5: 41,41,41,41,41

表记录

SYS@ orcl >select * from test.t1;

    ID NAME                           DATE1
---------- -------------------------------------------------- ---------
     1 AAAAA                          22-MAY-19
     2 bbbbb                          22-MAY-19
     3 tt                              23-MAY-19

Insert 一条记录，没提交事务，会写入DataBlock？

TEST@ orcl >create table t2 (id number ,name varchar2(20));
TEST@ orcl >insert into t2 values(1,'aaa');
TEST@ orcl >select rowid,id,name,DBMS_ROWID.ROWID_RELATIVE_FNO(rowid) file#,DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid) block# from test.t2;

ROWID               ID NAME                              FILE#    BLOCK#
------------------ ---------- -------------------------------------------------- ---------- ----------
AAAVWKAAFAAAAiXAAA        1 aaa                              5      2199

[oracle@DSI ~]$ sqlplus test/test
SQL> alter system flush buffer_cache;

System altered.

SQL> select rowid,id,name,DBMS_ROWID.ROWID_RELATIVE_FNO(rowid) file#,DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid) block# from test.t2;

no rows selected
SQL> alter system dump datafile 5 block 2199;

System altered.

SQL> select * from v$diag_info;

dump查看

[oracle@DSI ~]$ more /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_13566.trc
7F08FBDDA9D0 027C5507 C1020004 02800113 C20302C1  [.U|.............]
7F08FBDDA9E0 00AC2005 04000402 71410000 000000DB  [. ........Aq....]
7F08FBDDA9F0 012C7141 02C10202 61616103 72060603  [Aq,......aaa...r]
Block header dump:  0x01400897
 Object id on Block? Y
 seg/obj: 0x1558a  csc: 0x00.917206  itc: 2  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x1400890 ver: 0x01 opc: 0
     inc: 0  exflg: 0
 
 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.00b.00007877  0x00c00389.016c.15  ----    1  fsc 0x0000.00000000 ##对应的记录没有提交Flag=0
0x02   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000
bdba: 0x01400897
data_block_dump,data header at 0x7f08fbdd8a64
===============
tsiz: 0x1f98
hsiz: 0x14
pbl: 0x7f08fbdd8a64
     76543210
flag=--------
ntab=1
nrow=1
frre=-1
fsbo=0x14
fseo=0x1f8e
avsp=0x1f7a
tosp=0x1f7a
0xe:pti[0]    nrow=1    offs=0
0x12:pri[0]    offs=0x1f8e
block_row_dump:
tab 0, row 0, @0x1f8e
tl: 10 fb: --H-FL-- lb: 0x1  cc: 2 ##0x1代表在那个事务槽
col  0: [ 2]  c1 02
col  1: [ 3]  61 61 61
end_of_block_dump
End dump data blocks tsn: 5 file#: 5 minblk 2199 maxblk 2199
从dump上面看数据已经写入了block

bbed查看

BBED> set file 5 block 2199
BBED> p ktbbh
    ub2 ktbitflg                          @60       0x0001 (NONE) ##01代表锁了1行记录，00表示没有提交
BBED> dump
 File: /u01/app/oracle/oradata/orcl/test01.dbf (5)
 Block: 2199             Offsets:    0 to 8191           Dba:0x01400897
------------------------------------------------------------------------
 06a20000 97084001 06729100 00000304 0ed50000 01000000 8a550100 06729100 
 00000000 02003200 90084001 08000b00 77780000 8903c000 6c011500 01000000 
 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
 00000000 00010100 ffff1400 8e1f7a1f 7a1f0000 01008e1f e61b0500 06000700
 ..
  05207c02 040002c1 13018002 c10303c2 024a7c02 040002c1 13018002 c10a03c2 
 07567c02 040002c1 13018002 c10503c2 07557c02 040002c1 13018002 c10303c2 
 05207c02 040002c1 13018002 c10203c2 024a7c02 040002c1 13018002 c10a03c2 
 07567c02 040002c1 13018002 c10403c2 07557c02 040002c1 13018002 c10203c2 
 0520ac00 02040004 00004171 db000000 41712c01 0202c102 03616161 03060672 ##尾部校验
BBED> dump /v offset 8000 count 200
 File: /u01/app/oracle/oradata/orcl/test01.dbf (5)
 Block: 2199    Offsets: 8000 to 8191  Dba:0x01400897

flg= 0x800 /*transaction is commited*/
0x2000 /* commit time is upper bound*/
0x1000 /* this trac is actice as of ktbbhcsc*/

使用BBED手工修复DELETE数据

TEST@ orcl >select * from t2;

    ID NAME
---------- --------------------------------------------------
     1 aaa
     2 bbbbb
     3 ccccc
TEST@ orcl >alter system flush buffer_cache;
TEST@ orcl >select rowid,id,name,DBMS_ROWID.ROWID_RELATIVE_FNO(rowid) file#,DBMS_ROWID.ROWID_BLOCK_NUMBER(rowid) block# from test.t2;

ROWID               ID NAME                              FILE#    BLOCK#
------------------ ---------- -------------------------------------------------- ---------- ----------
AAAVWKAAFAAAAiXAAA        1 aaa                              5      2199
AAAVWKAAFAAAAiXAAB        2 bbbbb                              5      2199
AAAVWKAAFAAAAiXAAC        3 ccccc                              5      2199

在bbed查看是否提交，也可以使用dump命令进行查看

BBED> set file 5 block 2199
    FILE#              5
    BLOCK#             2199
BBED> map /v
 File: /u01/app/oracle/oradata/orcl/test01.dbf (5)
 Block: 2199                                  Dba:0x01400897
------------------------------------------------------------
 KTB Data Block (Table/Cluster)
  struct kdbh, 14 bytes                      @100     
    ub1 kdbhflag                            @100

BBED> p ktbbhitl
   ub2 ktbitflg                             @60       0x2001 (KTBFUPB)
BBED> p kdbr
sb2 kdbr[0]                                 @118      8078
sb2 kdbr[1]                                 @120      8066
sb2 kdbr[2]                                 @122      8054

BBED> p *kdbr[0]                                                               
rowdata[24]
-----------
ub1 rowdata[24]                             @8178     0x2c ##位置在相对位置加了100 ---8078+100（Assm），如果Mssm是加92
BBED> x/rncccccc
rowdata[24]                                 @8178    
-----------
flag@8178: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8179: 0x01
cols@8180:    2 ##2个列

col    0[2] @8181: 1 
col    1[3] @8184: aaa

删除测试

TEST@ orcl >delete from t2 where id=3;
1 row deleted.

TEST@ orcl >commit;
Commit complete.

TEST@ orcl >alter system flush buffer_cache;
System altered.

bbed重新登录一次
BBED> exit
BBED> p kdbr
sb2 kdbr[0]                                 @118      8078
sb2 kdbr[1]                                 @120      8066
sb2 kdbr[2]                                 @122      8054 

BBED> p *kdbr[2]     
rowdata[0]
----------
ub1 rowdata[0]                              @8154     0x3c ##标记是3c，表示已经被删除

BBED> x/rncccccc
rowdata[0]                                  @8154  ##相对位置加100
----------
flag@8154: 0x3c (KDRHFL, KDRHFF, KDRHFD, KDRHFH)
lock@8155: 0x01
cols@8156:    0

TEST@ orcl >select * from t2;
    ID NAME
---------- --------------------------------------------------
     1 aaa
     2 bbbbb
这里把3c修改成2c
BBED> modify /x 2c offset 8154  ##注意这里的位置是8154，而不是8054
 File: /u01/app/oracle/oradata/orcl/test01.dbf (5)
 Block: 2199             Offsets: 8154 to 8191           Dba:0x01400897
------------------------------------------------------------------------
 2c010202 c1040563 63636363 2c000202 c1030562 62626262 2c000202 c1020361 
 61610106 6b77 

 <32 bytes per line>

BBED> sum apply
Check value for File 5, Block 2199:
current = 0xf7f4, required = 0xf7f4
刷新一次，被删除的记录找到
TEST@ orcl >alter system flush buffer_cache;
System altered.
TEST@ orcl >select * from t2;

    ID NAME
---------- --------------------------------------------------
     1 aaa
     2 bbbbb
     3 ccccc

 下一篇介绍使用bbed进行update数据的测试和恢复

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原文地址：https://www.cnblogs.com/yhq1314/p/10945278.html