[20140624]bbed修改資料記錄(不等長).txt
[20140624]bbed修改資料記錄(不等長).txt
http://www.itpub.net/thread-1872851-1-1.html
--給出的問題修改記錄時,長度沒有變化,如果存在變化,修改與原來的不同,要修改kdbr[0]的值.
--還有一些細節的步驟.
SCOTT@test> @ver
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
create table itpub_t1 (id int,name varchar2(100));
insert into itpub_t1 values(1,'AAAAA');
insert into itpub_t1 values(2,'BBBBB');
commit;
alter system checkpoint;
SCOTT@test> SCOTT@test> select rowid,itpub_t1.* from itpub_t1;
ROWID ID NAME
------------------ ---------- --------------------
AABF2LAAEAAAAJEAAA 1 AAAAA
AABF2LAAEAAAAJEAAB 2 BBBBB
SCOTT@test> @lookup_rowid AABF2LAAEAAAAJEAAA
OBJECT FILE BLOCK ROW DBA TEXT
---------- ---------- ---------- ---------- -------------------- ----------------------------------------
286091 4 580 0 4,580 alter system dump datafile 4 block 580 ;
--bbed觀察:
BBED> set dba 4,580
DBA 0x01000244 (16777796 4,580)
BBED> p *kdbr[0]
rowdata[12]
-----------
ub1 rowdata[12] @8176 0x2c
BBED> x /rnc
rowdata[12] @8176
-----------
flag@8176: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8177: 0x01
cols@8178: 2
col 0[2] @8179: 1
col 1[5] @8182: AAAAA
-- 行記錄偏移在8176.
update itpub_t1 set name='1234' where name='AAAAA';
commit;
SCOTT@test> select rowid,itpub_t1.* from itpub_t1;
ROWID ID NAME
------------------ ---------- --------------------
AABF2LAAEAAAAJEAAA 1 1234
AABF2LAAEAAAAJEAAB 2 BBBBB
alter system checkpoint;
--bbed觀察:
BBED> set dba 4,580
DBA 0x01000244 (16777796 4,580)
BBED> p *kdbr[0]
rowdata[0]
----------
ub1 rowdata[0] @8153 0x2c
BBED> x /rnc
rowdata[0] @8153
----------
flag@8153: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8154: 0x02
cols@8155: 2
col 0[2] @8156: 1
col 1[4] @8159: 1234
BBED> set offset 8176
OFFSET 8176
BBED> x /rnc
rowdata[23] @8176
-----------
flag@8176: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8177: 0x00
cols@8178: 2
col 0[2] @8179: 1
col 1[5] @8182: AAAAA
--要恢復回來,僅僅需要修改kdbr[0] 的值=8076(少100,後面有說明).就ok了.
--關閉資料庫來操作看看.
BBED> p kdbr
sb2 kdbr[0] @118 8053
sb2 kdbr[1] @120 8064
--修改kdbr[0]=8076,而不是8176[注意要減少100.]
--這個很容易觀察,看現在的kdbr[0]=8053,對比前面的p *kdbr[0]看到的偏移量為8153,說明記錄的是相對偏移量.
BBED> p kdbr[0]
sb2 kdbr[0] @118 8053
BBED> dump /v count 2
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 118 to 119 Dba:0x01000244
-----------------------------------------------------------------------------------------
751f l u.
SYS@testdg> @10to16 8053
10 to 16 HEX REVERSE16
-------------- ------------------
0000000001f75 0x751f0000
--正好對上的.注意修改時要小頭在前(我的cpu是intel系列的).
SYS@testdg> @10to16 8076
10 to 16 HEX REVERSE16
-------------- ------------------
0000000001f8c 0x8c1f0000
BBED> modify /x 8c1f offset 118
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 118 to 119 Dba:0x01000244
----------------------------------------------------------------------------
8c1f
BBED> p kdbr[0]
sb2 kdbr[0] @118 8076
BBED> p *kdbr[0]
rowdata[23]
-----------
ub1 rowdata[23] @8176 0x2c
BBED> x /rnc
rowdata[23] @8176
-----------
flag@8176: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@8177: 0x00
cols@8178: 2
col 0[2] @8179: 1
col 1[5] @8182: AAAAA
--已經指向了修改的位置,並且修改正確.
BBED> sum apply
Check value for File 4, Block 580:
current = 0x8473, required = 0x8473
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle11g/oradata/test/users01.dbf
BLOCK = 580
Block Checking: DBA = 16777796, Block Type = KTB-managed data block
data header at 0x2a98318264
kdbchk: xaction header lock count mismatch
trans=2 ilk=1 nlo=0
Block 580 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
--依舊存在問題,沒有修改正確.
--仔細觀察lock@8154: 0x02 ,lock@8177: 0x00 不同,難道11g提交併沒有清楚這個標誌嗎?
BBED> modify /x 02 offset 8177
BBED> modify /x 00 offset 8154
BBED> sum apply
Check value for File 4, Block 580:
current = 0x8671, required = 0x8671
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle11g/oradata/test/users01.dbf
BLOCK = 580
Block Checking: DBA = 16777796, Block Type = KTB-managed data block
data header at 0x2a98318264
kdbchk: the amount of space used is not equal to block size
used=46 fsc=1 avsp=8042 dtl=8088
Block 580 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
--還有有問題.好像記錄長度變化,導致一些記錄資訊不對.
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 8053
sb2 kdbhavsp @110 8042
sb2 kdbhtosp @112 8043
BBED> dump /v offset 110 count 4
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 110 to 113 Dba:0x01000244
---------------------------------------------------------------------------------------------------------------------------------------------------------------
6a1f6b1f l j.k.
<48 bytes per line>
BBED> modify /x 6b1f offset 110
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 110 to 113 Dba:0x01000244
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
6b1f6b1f
<80 bytes per line>
BBED> sum apply
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle11g/oradata/test/users01.dbf
BLOCK = 580
Block Checking: DBA = 16777796, Block Type = KTB-managed data block
data header at 0x2a98318264
kdbchk: the amount of space used is not equal to block size
used=46 fsc=1 avsp=8043 dtl=8088
Block 580 failed with check code 6110
DBVERIFY - Verification complete
BBED> p ktbbhitl
struct ktbbhitl[0], 24 bytes @44
struct ktbitxid, 8 bytes @44
ub2 kxidusn @44 0x0005
ub2 kxidslt @46 0x0008
ub4 kxidsqn @48 0x00005d6c
struct ktbituba, 8 bytes @52
ub4 kubadba @52 0x00c003b3
ub2 kubaseq @56 0x1ff2
ub1 kubarec @58 0x08
ub2 ktbitflg @60 0x8000 (KTBFCOM)
union _ktbitun, 2 bytes @62
sb2 _ktbitfsc @62 0
ub2 _ktbitwrp @62 0x0000
ub4 ktbitbas @64 0xc2e7c553
struct ktbbhitl[1], 24 bytes @68
struct ktbitxid, 8 bytes @68
ub2 kxidusn @68 0x0005
ub2 kxidslt @70 0x0012
ub4 kxidsqn @72 0x00005d70
struct ktbituba, 8 bytes @76
ub4 kubadba @76 0x00c003b7
ub2 kubaseq @80 0x1ff2
ub1 kubarec @82 0x0a
ub2 ktbitflg @84 0x2001 (KTBFUPB)
union _ktbitun, 2 bytes @86
sb2 _ktbitfsc @86 1
ub2 _ktbitwrp @86 0x0001
ub4 ktbitbas @88 0xc2e7c87f
--修改以下位置為0
sb2 _ktbitfsc @86 1
ub2 _ktbitwrp @86 0x0001
BBED> modify /x 00 offset 86
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 86 to 89 Dba:0x01000244
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
00007fc8
--
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle11g/oradata/test/users01.dbf
BLOCK = 580
Block Checking: DBA = 16777796, Block Type = KTB-managed data block
data header at 0x2a9835e264
kdbchk: the amount of space used is not equal to block size
used=46 fsc=0 avsp=8043 dtl=8088
Block 580 failed with check code 6110
--依舊不行.修好avsp=8042看看.
BBED> modify /x 6a1f offset 110
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 110 to 113 Dba:0x01000244
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
6a1f6b1f
<80 bytes per line>
BBED> modify /x 6a1f offset 112
File: /u01/app/oracle11g/oradata/test/users01.dbf (4)
Block: 580 Offsets: 112 to 115 Dba:0x01000244
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
6a1f0000
<80 bytes per line>
BBED> sum apply
Check value for File 4, Block 580:
current = 0x8671, required = 0x8671
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/app/oracle11g/oradata/test/users01.dbf
BLOCK = 580
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
--ok透過.
檢視資料庫:
SCOTT@test> select rowid,itpub_t1.* from itpub_t1;
ROWID ID NAME
------------------ ---------- --------------------
AABF2LAAEAAAAJEAAA 1 AAAAA
AABF2LAAEAAAAJEAAB 2 BBBBB
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/267265/viewspace-1193074/，如需轉載，請註明出處，否則將追究法律責任。
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