标签：bbed 手工提交事务 oracle internal
测试数据准备：
SQL> create user sunhailong identifiedby abcd;
User created.
SQL> alter user sunhailong defaulttablespace users;
User altered.
SQL> grant dba to sunhailong;
Grant succeeded.
SQL> conn sunhailong
Enter password:
Connected.
SQL>
SQL>
SQL> drop table t_trans purge;
Table dropped.
SQL> create table tt_trans as select *from dba_objects where rownum<400;
Table created.
SQL> select count(*) from tt_trans;
COUNT(*)
----------
399
SQL> select distinctdbms_rowid.rowid_block_number(rowid) blk# from tt_trans;
BLK#
----------
70
72
68
69
71
SQL> COL OBJECT_NAME FOR A50
SQL> SET LINES 200 PAGES 999
select dbms_rowid.ROWID_BLOCK_NUMBER(rowid)BLK,
dbms_rowid.ROWID_RELATIVE_FNO(rowid) FNO,
dbms_rowid.ROWID_ROW_NUMBER(rowid) RNO,
object_id,
object_name
--dump(object_name)
from tt_trans
where object_id=22;
BLK FNO RNO OBJECT_ID OBJECT_NAME
---------- ---------- ---------- ------------------------------------------------------------
68 4 40 22 USER$
SQL> delete from tt_trans whereobject_id=22;
1 row deleted.
这里不提交
alter system flush buffer_cache;
BBED> set dba 4,68
DBA 0x0100003f(16777279 4,63)
--看ITL
BBED> p ktbbhitl
struct ktbbhitl[0], 24 bytes @44
struct ktbitxid, 8 bytes @44
ub2 kxidusn @44 0xffff
ub2 kxidslt @46 0x0000
ub4 kxidsqn @48 0x00000000
struct ktbituba, 8 bytes @52
ub4 kubadba @52 0x00000000
ub2 kubaseq @56 0x0000
ub1 kubarec @58 0x00
ub2 ktbitflg @60 0x8000 (KTBFCOM)
union _ktbitun, 2 bytes @62
b2 _ktbitfsc @62 0
ub2 _ktbitwrp @62 0x0000
ub4 ktbitbas @64 0x0309e7c2
struct ktbbhitl[1], 24 bytes @68
struct ktbitxid, 8 bytes @68
ub2 kxidusn @68 0x0009
ub2 kxidslt @70 0x0008
ub4 kxidsqn @72 0x00000139
struct ktbituba, 8 bytes @76
ub4 kubadba @76 0x00800062
ub2 kubaseq @80 0x00d3
ub1 kubarec @82 0x08
ub2 ktbitflg @84 0x0001 (NONE)
union _ktbitun, 2 bytes @86
b2 _ktbitfsc @86 72
ub2 _ktbitwrp @86 0x0048
ub4 ktbitbas @88 0x00000000
struct ktbbhitl[2], 24 bytes @92
struct ktbitxid, 8 bytes @92
ub2 kxidusn @92 0x0000
ub2 kxidslt @94 0x0000
ub4 kxidsqn @96 0x00000000
struct ktbituba, 8 bytes @100
ub4 kubadba @100 0x00000000
ub2 kubaseq @104 0x0000
ub1 kubarec @106 0x00
ub2 ktbitflg @108 0x0000 (NONE)
union _ktbitun, 2 bytes @110
b2 _ktbitfsc @110 0
ub2 _ktbitwrp @110 0x0000
ub4 ktbitbas @112 0x00000000
BBED> modify /x 0080 offset 84
File: /data/orcl/orcl/users01.dbf (4)
Block: 68 Offsets: 84 to 8191 Dba:0x01000044
------------------------------------------------------------------------
00804800 00000000 00000000 00000000 0000000000000000 00000000 00000000
BBED> dump offset 86 count 8
File: /data/orcl/orcl/users01.dbf (4)
Block: 68 Offsets: 86 to 93 Dba:0x01000044
------------------------------------------------------------------------
48000000 00000000
<32 bytes per line>
BBED> modify /x 0000 offset 86
File: /data/orcl/orcl/users01.dbf (4)
Block: 68 Offsets: 86 to 93 Dba:0x01000044
------------------------------------------------------------------------
00000000 00000000
<32 bytes per line>
BBED> sum apply
Check value for File 4, Block 68:
current = 0xfb97, required = 0xfb97
BBED> verify
DBVERIFY - Verification starting
FILE = /data/orcl/orcl/users01.dbf
BLOCK = 68
Block Checking: DBA = 16777284, Block Type= KTB-managed data block
data header at 0x2af82f9c327c
kdbchk: row locked by non-existenttransaction ---事务不一致，原因是行头的锁标记没有清理
table=0 slot=40
lockid=2 ktbbhitc=3
Block 68 failed with check code 6101
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
根据dump找到行号：
tab 0, row 40, @0x134c
tl: 2 fb: --HDFL-- lb: 0x2
tab 0, row 41, @0x1301
tl: 75 fb: --H-FL-- lb: 0x0 cc: 13
col 0: [ 3] 53 59 53
col 1: [ 6] 49 5f 43 4f 4e 32
col 2: *NULL*
col 3: [ 2] c1 32
col 4: [ 2] c1 32
col 5: [ 5] 49 4e 44 45 58
col 6: [ 7] 78 6c 03 0c 01 28 31
col 7: [ 7] 78 6c 03 0c 01 28 31
col 8: [19] 32 30 30 38 2d 30 33 2d31 32 3a 30 30 3a 33 39 3a 34 38
col 9: [ 5] 56 41 4c 49 44
col 10: [ 1] 4e
col 11: [ 1] 4e
清理锁标记：
BBED> p *kdbr[40]
rowdata[3866]
-------------
ub1 rowdata[3866] @5064 0x3c
BBED> x /rccccccccccc
rowdata[3866] @5064
-------------
flag@5064: 0x3c (KDRHFL, KDRHFF, KDRHFD,KDRHFH)
lock@5065: 0x02
cols@5066: 0
BBED> modify /x 3c00 offset 5064
File: /data/orcl/orcl/users01.dbf (4)
Block: 68 Offsets: 5064 to 5071 Dba:0x01000044
------------------------------------------------------------------------
3c000d03 53595305
<32 bytes per line>
BBED> sum apply
Check value for File 4, Block 68:
current = 0xf997, required = 0xf997
BBED> verify
DBVERIFY - Verification starting
FILE = /data/orcl/orcl/users01.dbf
BLOCK = 68
Block Checking: DBA = 16777284, Block Type= KTB-managed data block
data header at 0x1070fa7c
kdbchk: the amount of space used is notequal to block size
used=7118 fsc=0 avsp=874 dtl=8064 ---看报错变为kdbchk:the amount of space used is not equal to block size
Block 68 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
7118+874=7992 < dtl 8064
avsp=8064-7118=946
BBED> p kdbhavsp
b2 kdbhavsp @134 874
BBED> p kdbhtosp
b2 kdbhtosp @136 948
小技巧这里就不用计算了，根据kdbhtosp的16进制改就可以了。
BBED> dump offset 134 count 8
File: /data/orcl/orcl/users01.dbf (4)
Block: 68 Offsets: 134 to 141 Dba:0x01000044
------------------------------------------------------------------------
6a03b403 00005b00
kdbhtosp的值为b403 字节序反转后-2，为03b2，再反转回去b203
BBED> modify /x b203 offset 134
File: /data/orcl/orcl/users01.dbf (4)
Block: 68 Offsets: 134 to 141 Dba:0x01000044
------------------------------------------------------------------------
b203b403 00005b00
<32 bytes per line>
BBED> p kdbhavsp
b2 kdbhavsp @134 946
BBED> p kdbhtosp
b2 kdbhtosp @136 948
BBED> sum apply
Check value for File 4, Block 68:
current = 0xf94f, required = 0xf94f
BBED> verify
DBVERIFY - Verification starting
FILE = /data/orcl/orcl/users01.dbf
BLOCK = 68
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
修改完毕。
总结：
手工提交未提交事务需要修改4个地方
1.数据块对应事务ITL槽的ktbitflg
2.清空数据块对应事务ITL槽的_ktbitwrp
3.清理行头锁标记为00
4.重新计算kdbhavsp值，并依据kdbhtosp值进行修改（其实kdbhtosp值也可以改为与kdbhavsp一致，如果不改在这里也是可以校验通过的）
标签：bbed 手工提交事务 oracle internal
原文地址：http://blog.csdn.net/card_2005/article/details/43306141
