Monthly Archives: 十月 2012

recover遇到坏块处理本质探讨

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如果在还原出来的数据文件中有坏块,而归档日志和联机日志是正常的,那么在应用日志恢复过程中,会出现什么情况,这里通过一个简单的测试给予其中一种情况的说明
创建测试表

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

SQL> create table t_xifenfei(object_id,object_name) tablespace xifenfei
  2  as
  3  select object_id,object_name from dba_objects      
  4  where rownum<11;

Table created.

SQL> col object_name for a30
SQL> select   object_id,object_name,
  2   dbms_rowid.rowid_relative_fno(rowid)rel_fno,
  3  dbms_rowid.rowid_block_number(rowid)blockno
  4   from chf.t_xifenfei;

 OBJECT_ID OBJECT_NAME                       REL_FNO    BLOCKNO
---------- ------------------------------ ---------- ----------
        20 ICOL$                                   5         12
        44 I_USER1                                 5         12
        28 CON$                                    5         12
        15 UNDO$                                   5         12
        29 C_COBJ#                                 5         12
         3 I_OBJ#                                  5         12
        25 PROXY_ROLE_DATA$                        5         12
        39 I_IND1                                  5         12
        51 I_CDEF2                                 5         12
        26 I_PROXY_ROLE_DATA$_1                    5         12

10 rows selected.

SQL> select name from v$datafile where file#=5;

NAME
--------------------------------------------------------------
/u01/oracle/oradata/XFF/xifenfei01.dbf

SQL> update t_xifenfei set object_name='WWW.XIFENFEI.COM';

10 rows updated.

SQL> commit;

Commit complete.

SQL> create table t_xifenfei_new(object_id,object_name) tablespace xifenfei
  2  as
  3  select object_id,object_name from dba_objects      
  4  where rownum<11;

Table created.

SQL> conn / as sysdba
Connected.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

备份数据文件

[oracle@xifenfei XFF]$ cp xifenfei01.dbf  ../tmp/
[oracle@xifenfei XFF]$ ll ../tmp/xifenfei01.dbf 
-rw-r----- 1 oracle oinstall 10493952 Sep 28 19:05 ../tmp/xifenfei01.dbf
[oracle@xifenfei XFF]$ date
Fri Sep 28 19:05:42 CST 2012

bbed破坏备份文件

[oracle@xifenfei XFF]$ bbed password=blockedit

BBED: Release 2.0.0.0.0 - Limited Production on Fri Sep 28 19:05:59 2012

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

************* !!! For Oracle Internal Use only !!! ***************

BBED> set filename '/u01/oracle/oradata/tmp/xifenfei01.dbf'
        FILENAME        /u01/oracle/oradata/tmp/xifenfei01.dbf

BBED> set block 12
        BLOCK#          12

BBED> set mode edit
        MODE            Edit

BBED> map
 File: /u01/oracle/oradata/tmp/xifenfei01.dbf (0)
 Block: 12                                    Dba:0x00000000
------------------------------------------------------------
 KTB Data Block (Table/Cluster)

 struct kcbh, 20 bytes                      @0       

 struct ktbbh, 96 bytes                     @20      

 struct kdbh, 14 bytes                      @124     

 struct kdbt[1], 4 bytes                    @138     

 sb2 kdbr[10]                               @142     

 ub1 freespace[7666]                        @162     

 ub1 rowdata[360]                           @7828    

 ub4 tailchk                                @8188    


BBED> p kcbh
struct kcbh, 20 bytes                       @0       
   ub1 type_kcbh                            @0        0x06
   ub1 frmt_kcbh                            @1        0xa2
   ub1 spare1_kcbh                          @2        0x00
   ub1 spare2_kcbh                          @3        0x00
   ub4 rdba_kcbh                            @4        0x0140000c
   ub4 bas_kcbh                             @8        0x0004d7b0
   ub2 wrp_kcbh                             @12       0x000a
   ub1 seq_kcbh                             @14       0x01
   ub1 flg_kcbh                             @15       0x06 (KCBHFDLC, KCBHFCKV)
   ub2 chkval_kcbh                          @16       0xe573
   ub2 spare3_kcbh                          @18       0x0000

BBED> d offset 8188
 File: /u01/oracle/oradata/tmp/xifenfei01.dbf (0)
 Block: 12               Offsets: 8188 to 8191           Dba:0x00000000
------------------------------------------------------------------------
 0106b0d7 

 <32 bytes per line>

BBED> m /x 11
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
 File: /u01/oracle/oradata/tmp/xifenfei01.dbf (0)
 Block: 12               Offsets: 8188 to 8191           Dba:0x00000000
------------------------------------------------------------------------
 1106b0d7 

 <32 bytes per line>

BBED> sum apply
Check value for File 0, Block 12:
current = 0xe563, required = 0xe563

BBED> verify
DBVERIFY - Verification starting
FILE = /u01/oracle/oradata/tmp/xifenfei01.dbf
BLOCK = 12

Block 12 is corrupt
Corrupt block relative dba: 0x0140000c (file 0, block 12)
Fractured block found during verification
Data in bad block:
 type: 6 format: 2 rdba: 0x0140000c
 last change scn: 0x000a.0004d7b0 seq: 0x1 flg: 0x06
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0xd7b00611
 check value in block header: 0xe563
 computed block checksum: 0x0


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   : 1
Total Blocks Influx           : 2

修改数据库记录

SQL> startup
ORACLE instance started.

Total System Global Area  318767104 bytes
Fixed Size                  1267236 bytes
Variable Size             109054428 bytes
Database Buffers          201326592 bytes
Redo Buffers                7118848 bytes
Database mounted.
Database opened.
SQL> conn chf/xifenfei
Connected.
SQL> update t_xifenfei set object_name='惜分飞';

10 rows updated.

SQL> update t_xifenfei_new set object_name='惜分飞';

10 rows updated.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> conn / as sysdba
Connected.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

利用备份数据文件恢复数据库

[oracle@xifenfei XFF]$ cp xifenfei01.dbf xifenfei01.dbf_bak
[oracle@xifenfei XFF]$ cp ../tmp/xifenfei01.dbf  xifenfei01.dbf
[oracle@xifenfei XFF]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Fri Sep 28 19:13:59 2012

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area  318767104 bytes
Fixed Size                  1267236 bytes
Variable Size             109054428 bytes
Database Buffers          201326592 bytes
Redo Buffers                7118848 bytes
Database mounted.
ORA-01113: file 5 needs media recovery
ORA-01110: data file 5: '/u01/oracle/oradata/XFF/xifenfei01.dbf'
--提示数据需要恢复

SQL> recover datafile 5;
ORA-00279: change 42949990720 generated at 09/28/2012 19:04:10 needed for
thread 1
ORA-00289: suggestion : /u01/oracle/oradata/XFF/archivelog/1_24_792679299.dbf
ORA-00280: change 42949990720 for thread 1 is in sequence #24


Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
Log applied.
Media recovery complete.
SQL> alter database open;

Database altered.
--利用被破坏的数据文件+归档日志恢复数据库正常

SQL> col object_name for a30
SQL> select   object_id,object_name from t_xifenfei;
select   object_id,object_name from t_xifenfei
                                    *
ERROR at line 1:
ORA-01578: ORACLE data block corrupted (file # 5, block # 12)
ORA-01110: data file 5: '/u01/oracle/oradata/XFF/xifenfei01.dbf'
--提示被破坏的数据块,查询不能完成

--证明坏块之外的数据块还是被正常应用日志
SQL>  select   object_id,object_name from t_xifenfei_new;

 OBJECT_ID OBJECT_NAME
---------- ------------------------------
        20 惜分飞
        44 惜分飞
        28 惜分飞
        15 惜分飞
        29 惜分飞
         3 惜分飞
        25 惜分飞
        39 惜分飞
        51 惜分飞
        26 惜分飞

10 rows selected.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

dbv检查坏块

[oracle@xifenfei XFF]$ dbv file=xifenfei01.dbf

DBVERIFY: Release 10.2.0.4.0 - Production on Fri Sep 28 19:14:52 2012

Copyright (c) 1982, 2007, Oracle.  All rights reserved.

DBVERIFY - Verification starting : FILE = xifenfei01.dbf

DBV-00200: Block, DBA 20971532, already marked corrupt
--这里可以看出来，该数据块已经被标志为坏块

DBVERIFY - Verification complete

Total Pages Examined         : 1280
Total Pages Processed (Data) : 2
Total Pages Failing   (Data) : 0
Total Pages Processed (Index): 0
Total Pages Failing   (Index): 0
Total Pages Processed (Other): 14
Total Pages Processed (Seg)  : 0
Total Pages Failing   (Seg)  : 0
Total Pages Empty            : 1264
Total Pages Marked Corrupt   : 1
Total Pages Influx           : 0
Highest block SCN            : 318700 (10.318700)

查看恢复过程alert日志

Fri Sep 28 19:14:06 2012
Database mounted in Exclusive Mode
Completed: ALTER DATABASE   MOUNT
Fri Sep 28 19:14:06 2012
ALTER DATABASE OPEN
ORA-1113 signalled during: ALTER DATABASE OPEN...
Fri Sep 28 19:14:11 2012
ALTER DATABASE RECOVER  datafile 5  
Media Recovery Start
 parallel recovery started with 2 processes
ORA-279 signalled during: ALTER DATABASE RECOVER  datafile 5  ...
Fri Sep 28 19:14:16 2012
ALTER DATABASE RECOVER    CONTINUE DEFAULT  
Fri Sep 28 19:14:16 2012

--恢复数据库的时候,发现坏块
Media Recovery Log /u01/oracle/oradata/XFF/archivelog/1_24_792679299.dbf
Fri Sep 28 19:14:16 2012
Hex dump of (file 5, block 12) in trace file /u01/oracle/admin/XFF/bdump/xff_p001_23011.trc
Corrupt block relative dba: 0x0140000c (file 5, block 12)
Fractured block found during media recovery
Data in bad block:
 type: 6 format: 2 rdba: 0x0140000c
 last change scn: 0x000a.0004d7b0 seq: 0x1 flg: 0x06
 spare1: 0x0 spare2: 0x0 spare3: 0x0
 consistency value in tail: 0xd7b00611
 check value in block header: 0xe563
 computed block checksum: 0x0
Reread of rdba: 0x0140000c (file 5, block 12) found same corrupted data

--继续恢复
Fri Sep 28 19:14:16 2012
Recovery of Online Redo Log: Thread 1 Group 1 Seq 25 Reading mem 0
  Mem# 0: /u01/oracle/oradata/XFF/redo01.log
Fri Sep 28 19:14:16 2012
Recovery of Online Redo Log: Thread 1 Group 2 Seq 26 Reading mem 0
  Mem# 0: /u01/oracle/oradata/XFF/redo02.log
Fri Sep 28 19:14:16 2012
Recovery of Online Redo Log: Thread 1 Group 3 Seq 27 Reading mem 0
  Mem# 0: /u01/oracle/oradata/XFF/redo03.log
Fri Sep 28 19:14:16 2012
Media Recovery Complete (XFF)
Completed: ALTER DATABASE RECOVER    CONTINUE DEFAULT  
Fri Sep 28 19:14:31 2012
alter database open

bbed查看修改相关信息

BBED> set filename '/u01/oracle/oradata/XFF/xifenfei01.dbf'
        FILENAME        /u01/oracle/oradata/XFF/xifenfei01.dbf

BBED> set block 12
        BLOCK#          12

BBED> map
 File: /u01/oracle/oradata/XFF/xifenfei01.dbf (0)
 Block: 12                                    Dba:0x00000000
------------------------------------------------------------
 KTB Data Block (Table/Cluster)

 struct kcbh, 20 bytes                      @0       

 struct ktbbh, 96 bytes                     @20      

 struct kdbh, 14 bytes                      @124     

 struct kdbt[1], 4 bytes                    @138     

 sb2 kdbr[10]                               @142     

 ub1 freespace[7666]                        @162     

 ub1 rowdata[360]                           @7828    

 ub4 tailchk                                @8188    


BBED> p kcbh
struct kcbh, 20 bytes                       @0       
   ub1 type_kcbh                            @0        0x06
   ub1 frmt_kcbh                            @1        0xa2
   ub1 spare1_kcbh                          @2        0x00
   ub1 spare2_kcbh                          @3        0x00
   ub4 rdba_kcbh                            @4        0x0140000c
   ub4 bas_kcbh                             @8        0x00000000
   ub2 wrp_kcbh                             @12       0x0000
   ub1 seq_kcbh                             @14       0xff   <--因为被标记为坏块,所以为ff
   ub1 flg_kcbh                             @15       0x04 (KCBHFCKV)
   ub2 chkval_kcbh                          @16       0xe77d
   ub2 spare3_kcbh                          @18       0x0000

--查看数据块中记录
BBED> p *kdbr[5]
rowdata[69]
-----------
ub1 rowdata[69]                             @7897     0x2c

BBED> x /rnc
rowdata[69]                                 @7897    
-----------
flag@7897: 0x2c (KDRHFL, KDRHFF, KDRHFH)
lock@7898: 0x02
cols@7899:    2

col    0[2] @7900: 3 
col   1[16] @7903: WWW.XIFENFEI.COM  <--确实没有被恢复,而是直接被跳过


BBED> set mode edit
        MODE            Edit

BBED> m /x 01 offset 14
Warning: contents of previous BIFILE will be lost. Proceed? (Y/N) y
 File: /u01/oracle/oradata/XFF/xifenfei01.dbf (0)
 Block: 12               Offsets:   14 to  525           Dba:0x00000000
------------------------------------------------------------------------
 01047de7 00000100 00000dcc 000098d7 ………… 

 <32 bytes per line>

BBED> d offset 8188
 File: /u01/oracle/oradata/XFF/xifenfei01.dbf (0)
 Block: 12               Offsets: 8188 to 8191           Dba:0x00000000
------------------------------------------------------------------------
 ff060000    <--这么说明:数据块被标志为坏块的时候，同时会修改tailchk值

 <32 bytes per line>

BBED> m /x 01 offset 8188
 File: /u01/oracle/oradata/XFF/xifenfei01.dbf (0)
 Block: 12               Offsets: 8188 to 8191           Dba:0x00000000
------------------------------------------------------------------------
 01060000 

 <32 bytes per line>

BBED> sum apply
Check value for File 0, Block 12:
current = 0xe77d, required = 0xe77d

--验证块已经标记为正常块
BBED> verify
DBVERIFY - Verification starting
FILE = /u01/oracle/oradata/XFF/xifenfei01.dbf
BLOCK = 12


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

启动数据库测试

SQL> startup
ORACLE instance started.

Total System Global Area  318767104 bytes
Fixed Size                  1267236 bytes
Variable Size             109054428 bytes
Database Buffers          201326592 bytes
Redo Buffers                7118848 bytes
Database mounted.
Database opened.
SQL> conn chf/xifenfei
Connected.
SQL> col object_name for a30
SQL> select   object_id,object_name from t_xifenfei;

 OBJECT_ID OBJECT_NAME
---------- ------------------------------
        20 WWW.XIFENFEI.COM
        44 WWW.XIFENFEI.COM
        28 WWW.XIFENFEI.COM
        15 WWW.XIFENFEI.COM
        29 WWW.XIFENFEI.COM
         3 WWW.XIFENFEI.COM
        25 WWW.XIFENFEI.COM
        39 WWW.XIFENFEI.COM
        51 WWW.XIFENFEI.COM
        26 WWW.XIFENFEI.COM

10 rows selected.

--通过修改数据块的seq_kcbh和tailchk,让这个块恢复正常,但是记录依然丢失，
--因为应用日志恢复之时标记为坏块跳过该块的日志应用

通过实验证明:
1.如果只有数据块异常,应用日志恢复,不一定会出现ORA-600[3020],而是直接把该块标记为坏块,继续应用日志
2.标记坏块其实就是修改seq_kcbh为ff,同时也修改tailchk值
3.经验值:如果在数据库应用日志恢复的时候,如果出现ORA-600[3020]错误,可以使用allow 2 corruption来跳过坏块处理,其实也是修改seq_kcbh为ff,然后让数据库跳过该块的恢复.

large pool太小导致shared server异常

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数据库出现如下错误

Fri Oct  5 09:33:54 2012
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20
Process S001 started up but failed with error = 20
failed to start shared server 'S001', oer=20

重启后错误提示变为

Successfully onlined Undo Tablespace 1.
Fri Oct  5 09:34:41 2012
SMON: enabling tx recovery
Fri Oct  5 09:34:41 2012
Database Characterset is AL32UTF8
replication_dependency_tracking turned off (no async multimaster replication found)
Completed: ALTER DATABASE OPEN
Fri Oct  5 13:53:50 2012
Errors in file /oracle/admin/ora/bdump/ora_s000_25948.trc:
ORA-04031: unable to allocate 72 bytes of shared memory 
("large pool","unknown object","session heap","trigger condition node")
Fri Oct  5 13:53:50 2012
Errors in file /oracle/admin/ora/bdump/ora_s000_25948.trc:
ORA-00600: internal error code, arguments: [ksudel1], [], [], [], [], [], [], []
ORA-04031: unable to allocate 72 bytes of shared memory 
("large pool","unknown object","session heap","trigger condition node")
Fri Oct  5 13:54:52 2012
found dead shared server 'S000', pid = (11, 1)
Fri Oct  5 17:25:59 2012
Errors in file /oracle/admin/ora/bdump/ora_s000_31081.trc:
ORA-04031: unable to allocate 72 bytes of shared memory 
("large pool","unknown object","session heap","trigger condition node")
Fri Oct  5 17:25:59 2012
Errors in file /oracle/admin/ora/bdump/ora_s000_31081.trc:
ORA-00600: internal error code, arguments: [ksudel1], [], [], [], [], [], [], []
ORA-04031: unable to allocate 72 bytes of shared memory 
("large pool","unknown object","session heap","trigger condition node")

通过这里的错误,我们可以看到是large pool不能分配72 bytes的连续内存空间而使得S000进程报错.那这两者有什么联系:我们知道S000是shared server的进程,那shared server为什么导致large pool不足呢？查询官方文档得出,如下三种情况会使用large pool

Session memory for the shared server and the Oracle XA interface 
(used where transactions interact with more than one database)

I/O server processes

Oracle backup and restore operations

主要也就是shared server/parallel query buffers/backup restore这几个操作会使用到large pool.在该案例中很明显的可以看到是因为shared server进程需要分配large pool中一部分空间,而没有连续空间从而出现该错误.数据库相关参数配置

SQL> show parameter mts;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
mts_circuits                         integer     555
mts_dispatchers                      string      (PROTOCOL=TCP) (SERVICE=oraXDB)
mts_listener_address                 string
mts_max_dispatchers                  integer     5
mts_max_servers                      integer     20
mts_multiple_listeners               boolean     FALSE
mts_servers                          integer     1
mts_service                          string      ora
mts_sessions                         integer     550

SQL> show parameter large;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
large_pool_size                      big integer 16777216

这里可以看出来,数据库明显配置了MTS,因为数据库在启动时候,最少会建立一个shared server进程,而这个时候因为large pool太小(16M),导致该进程无法正常建立,从而出现上述alert中相关错误,临时处理方法增加large pool.后续需要关注业务特点,考虑是否可以采用Oracle Dedicated server模式来处理.

logminer相关操作验证

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在哪些情况下,数据库不启动附加日志不能正常的被Logminer捕获到的,这里做了一个简单的测试,说明在不启用附加日志的情况下,很多操作不能被捕获,不仅仅是行迁移的数据记录.当然本实验仅供参考,因为在不同的数据库版本,不同的平台,甚至不同的操作都可能出现不同的结果.如果想要数据库日志通过Logminer获得较为完整的sql语句,强烈建议打开附加日志(当然会产生多一点日志,可能增加磁盘io的负担,凡事都有两面性,则其善而从之)
数据库版本

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production

插入数据

--为了减少测试redo影响,切换归档日志
SQL> alter system switch logfile;

System altered.

SQL> show user;
USER is "CHF"

--当前scn
SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949934814

--当前redo logfile
SQL> select member from v$logfile where group# in(
  2  select group# from v$log where status='CURRENT');

MEMBER
------------------------------------------------------------------
/u01/oracle/oradata/XFF/redo03.log

--创建测试表并插入数据
SQL> create table xifenfei(id number,name varchar2(4000));

Table created.

SQL> insert into xifenfei values(1,'xifenfei');

1 row created.

SQL> insert into xifenfei values(2,'XIFENFEI');

1 row created.

SQL> insert into xifenfei values(3,'XiFenFei');

1 row created.

SQL> commit;

Commit complete.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949934864

--数据存储的datafile 和blocknum
SQL> select id,rowid,dbms_rowid.ROWID_RELATIVE_FNO(rowid) file_num,
  2  dbms_rowid.rowid_block_number(rowid) block_num from xifenfei;

        ID ROWID                FILE_NUM  BLOCK_NUM
---------- ------------------ ---------- ----------
         1 AAAMuvAAJAAAAmkAAA          9       2468
         2 AAAMuvAAJAAAAmkAAB          9       2468
         3 AAAMuvAAJAAAAmkAAC          9       2468

--dump数据块
SQL> alter system dump datafile 9 block 2468;

System altered.

--dump datablock内容
Block header dump:  0x024009a4
 Object id on Block? Y
 seg/obj: 0xcbaf  csc: 0x0a.3ff09  itc: 2  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x24009a1 ver: 0x01 opc: 0
     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.019.0000010d  0x00800b85.0111.2f  --U-    3  fsc 0x0000.0003ff0e
0x02   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000

data_block_dump,data header at 0xcf6c464
===============
tsiz: 0x1f98
hsiz: 0x18
pbl: 0x0cf6c464
bdba: 0x024009a4
     76543210
flag=--------
ntab=1
nrow=3
frre=-1
fsbo=0x18
fseo=0x1f6b
avsp=0x1f53
tosp=0x1f53
0xe:pti[0]      nrow=3  offs=0
0x12:pri[0]     offs=0x1f89
0x14:pri[1]     offs=0x1f7a
0x16:pri[2]     offs=0x1f6b
block_row_dump:
tab 0, row 0, @0x1f89
tl: 15 fb: --H-FL-- lb: 0x1  cc: 2
col  0: [ 2]  c1 02
col  1: [ 8]  78 69 66 65 6e 66 65 69
tab 0, row 1, @0x1f7a
tl: 15 fb: --H-FL-- lb: 0x1  cc: 2
col  0: [ 2]  c1 03
col  1: [ 8]  58 49 46 45 4e 46 45 49
tab 0, row 2, @0x1f6b
tl: 15 fb: --H-FL-- lb: 0x1  cc: 2
col  0: [ 2]  c1 04
col  1: [ 8]  58 69 46 65 6e 46 65 69
--可以清楚的看到这三条记录都存在一个数据块中,并未发生行迁移等情况

--dump redo log
SQL> alter system dump logfile '/u01/oracle/oradata/XFF/redo03.log'
  2    scn min 42949934814 scn max 42949934864;

System altered.

--dump redo logfile内容
CHANGE #9 TYP:0 CLS: 4 AFN:9 DBA:0x024009a3 OBJ:52143 SCN:0x000a.0003ff0e SEQ:  1 OP:13.28
Low HWM
      Highwater::  0x024009a9  ext#: 0      blk#: 8      ext size: 8
  #blocks in seg. hdr's freelists: 0
  #blocks below: 5
  mapblk  0x00000000  offset: 0
lfdba:  0x024009a1 CHANGE #10 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0003ff0e SEQ:  1 OP:11.2
KTB Redo
op: 0x01  ver: 0x01
op: F  xid:  0x0008.019.0000010d    uba: 0x00800b85.0111.2d
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) size/delt: 15
fb: --H-FL-- lb: 0x1  cc: 2
null: --
col  0: [ 2]  c1 02
col  1: [ 8]  78 69 66 65 6e 66 65 69

CHANGE #11 TYP:0 CLS:31 AFN:2 DBA:0x00800079 OBJ:4294967295 SCN:0x000a.0003fe8f SEQ:  1 OP:5.2
ktudh redo: slt: 0x0019 sqn: 0x0000010d flg: 0x0012 siz: 108 fbi: 0
            uba: 0x00800b85.0111.2d    pxid:  0x0000.000.00000000
CHANGE #12 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0003ff0e SEQ:  2 OP:11.2
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x00800b85.0111.2e
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1) size/delt: 15
fb: --H-FL-- lb: 0x1  cc: 2
null: --
col  0: [ 2]  c1 03
col  1: [ 8]  58 49 46 45 4e 46 45 49

CHANGE #13 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0003ff0e SEQ:  3 OP:11.2
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x00800b85.0111.2f
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2) size/delt: 15
fb: --H-FL-- lb: 0x1  cc: 2
null: --
col  0: [ 2]  c1 04
col  1: [ 8]  58 69 46 65 6e 46 65 69
--这里可以看到，只有redo的信息，没有太多undo信息(因为是插入数据)

--使用Logminer
SQL> conn / as sysdba
Connected.
SQL> exec dbms_logmnr.add_logfile('/u01/oracle/oradata/XFF/redo03.log',dbms_logmnr.new);  

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_Logminer(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

SQL> select TABLE_NAME,sql_redo from v$Logminer_contents where SEG_NAME='XIFENFEI';

TABLE_NAME                       SQL_REDO
-------------------------------- -------------------------------------------------------
XIFENFEI                         create table xifenfei(id number,name varchar2(4000));

SQL> EXEC dbms_logmnr.END_Logminer;

PL/SQL procedure successfully completed.
--这里可以明确的看到,Logminer没有找到任何关于这个表的dml操作,也就是说三条insert都没有被找到

说明:在redo中已经包含了insert操作的相关记录,但是因为没有启用附加日志,是的Logminer不能正常获得相关操作语句

简单更新操作

SQL> alter system switch logfile;

System altered.

SQL> conn chf/xifenfei
Connected.
SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949941538

SQL> select member from v$logfile where group# in(
  2  select group# from v$log 
  3  where status='CURRENT');

MEMBER
---------------------------------------------------------------
/u01/oracle/oradata/XFF/redo01.log

SQL> update xifenfei set name='www.orasos.com' where id=1;

1 row updated.

SQL> update xifenfei set name='WWW.XIFENFEI.COM' WHERE ID=2;

1 row updated.

SQL> update xifenfei set name='www.orasos.com' where id=3;

1 row updated.

SQL> commit;

Commit complete.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949941552

SQL> alter system dump datafile 9 block 2468;

System altered.

--dump datablock
Block header dump:  0x024009a4
 Object id on Block? Y
 seg/obj: 0xcbaf  csc: 0x0a.4192a  itc: 2  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x24009a1 ver: 0x01 opc: 0
     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.019.0000010d  0x00800b85.0111.2f  C---    0  scn 0x000a.0003ff0e
0x02   0x0003.004.0000014e  0x0080002b.01a6.3b  --U-    3  fsc 0x0000.0004192d

data_block_dump,data header at 0xdf83464
===============
tsiz: 0x1f98
hsiz: 0x18
pbl: 0x0df83464
bdba: 0x024009a4
     76543210
flag=--------
ntab=1
nrow=3
frre=-1
fsbo=0x18
fseo=0x1f28
avsp=0x1f3d
tosp=0x1f3d
0xe:pti[0]      nrow=3  offs=0
0x12:pri[0]     offs=0x1f54
0x14:pri[1]     offs=0x1f3d
0x16:pri[2]     offs=0x1f28
block_row_dump:
tab 0, row 0, @0x1f54
tl: 23 fb: --H-FL-- lb: 0x2  cc: 2
col  0: [ 2]  c1 02
col  1: [16]  77 77 77 2e 78 69 66 65 6e 66 65 69 2e 63 6f 6d
tab 0, row 1, @0x1f3d
tl: 23 fb: --H-FL-- lb: 0x2  cc: 2
col  0: [ 2]  c1 03
col  1: [16]  57 57 57 2e 58 49 46 45 4e 46 45 49 2e 43 4f 4d
tab 0, row 2, @0x1f28
tl: 21 fb: --H-FL-- lb: 0x2  cc: 2
col  0: [ 2]  c1 04
col  1: [14]  77 77 77 2e 6f 72 61 73 6f 73 2e 63 6f 6d


SQL> alter system dump logfile '/u01/oracle/oradata/XFF/redo01.log'
  2    scn min 42949941538 scn max 42949941552;

System altered.

--dump redo log
REDO RECORD - Thread:1 RBA: 0x000013.00000002.0010 LEN: 0x0408 VLD: 0x0d
SCN: 0x000a.0004192d SUBSCN:  1 09/26/2012 23:31:27
CHANGE #1 TYP:2 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0003ff0e SEQ:  5 OP:11.5
KTB Redo
op: 0x11  ver: 0x01
op: F  xid:  0x0003.004.0000014e    uba: 0x0080002b.01a6.39
Block cleanout record, scn:  0x000a.0004192a ver: 0x01 opt: 0x02, entries follow...
  itli: 1  flg: 2  scn: 0x000a.0003ff0e
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 2 ckix: 251
ncol: 2 nnew: 1 size: 8
col  1: [16]  77 77 77 2e 78 69 66 65 6e 66 65 69 2e 63 6f 6d

CHANGE #2 TYP:0 CLS:21 AFN:2 DBA:0x00800029 OBJ:4294967295 SCN:0x000a.00041781 SEQ:  1 OP:5.2
ktudh redo: slt: 0x0004 sqn: 0x0000014e flg: 0x0012 siz: 136 fbi: 0
            uba: 0x0080002b.01a6.39    pxid:  0x0000.000.00000000
CHANGE #3 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0004192d SEQ:  1 OP:11.5
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x0080002b.01a6.3a
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1) flag: 0x2c lock: 2 ckix: 12
ncol: 2 nnew: 1 size: 8
col  1: [16]  57 57 57 2e 58 49 46 45 4e 46 45 49 2e 43 4f 4d

CHANGE #4 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0004192d SEQ:  2 OP:11.5
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x0080002b.01a6.3b
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2) flag: 0x2c lock: 2 ckix: 12
ncol: 2 nnew: 1 size: 6
col  1: [14]  77 77 77 2e 6f 72 61 73 6f 73 2e 63 6f 6d
--OP:11.5 Update Row Piece 
--包含了修改后的值(后镜像)

CHANGE #5 TYP:0 CLS:21 AFN:2 DBA:0x00800029 OBJ:4294967295 SCN:0x000a.0004192d SEQ:  1 OP:5.4
ktucm redo: slt: 0x0004 sqn: 0x0000014e srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080002b.01a6.3b ext: 0 spc: 416 fbi: 0
--OP:5.4  Commit transaction (transaction table update) 

CHANGE #6 TYP:0 CLS:22 AFN:2 DBA:0x0080002b OBJ:4294967295 SCN:0x000a.00041780 SEQ:  2 OP:5.1
ktudb redo: siz: 136 spc: 750 flg: 0x0012 seq: 0x01a6 rec: 0x39
            xid:  0x0003.004.0000014e
ktubl redo: slt: 4 rci: 0 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo        Begin trans    Last buffer split:  No
Temp Object:  No
Tablespace Undo:  No
             0x00000000  prev ctl uba: 0x0080002b.01a6.37
prev ctl max cmt scn:  0x000a.00040ff1  prev tx cmt scn:  0x000a.00041076
txn start scn:  0x0000.00000000  logon user: 59  prev brb: 8391493  prev bcl: 0 KDO undo record:
KTB Redo
op: 0x03  ver: 0x01
op: Z
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 251
ncol: 2 nnew: 1 size: -8
col  1: [ 8]  78 69 66 65 6e 66 65 69

CHANGE #7 TYP:0 CLS:22 AFN:2 DBA:0x0080002b OBJ:4294967295 SCN:0x000a.0004192d SEQ:  1 OP:5.1
ktudb redo: siz: 96 spc: 612 flg: 0x0022 seq: 0x01a6 rec: 0x3a
            xid:  0x0003.004.0000014e
ktubu redo: slt: 4 rci: 57 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No
Tablespace Undo:  No
             0x00000000
KDO undo record:
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x0080002b.01a6.39
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1) flag: 0x2c lock: 0 ckix: 12
ncol: 2 nnew: 1 size: -8
col  1: [ 8]  58 49 46 45 4e 46 45 49

CHANGE #8 TYP:0 CLS:22 AFN:2 DBA:0x0080002b OBJ:4294967295 SCN:0x000a.0004192d SEQ:  2 OP:5.1
ktudb redo: siz: 96 spc: 514 flg: 0x0022 seq: 0x01a6 rec: 0x3b
            xid:  0x0003.004.0000014e
ktubu redo: slt: 4 rci: 58 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No
Tablespace Undo:  No
             0x00000000
KDO undo record:
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x0080002b.01a6.3a
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2) flag: 0x2c lock: 0 ckix: 12
ncol: 2 nnew: 1 size: -6
col  1: [ 8]  58 69 46 65 6e 46 65 69
--OP:5.1 Undo block or undo segment header
--包含了前镜像(修改前的值,其实就是undo中记录)

--Logminer操作
SQL> conn / as sysdba
Connected.
SQL> exec dbms_logmnr.add_logfile('/u01/oracle/oradata/XFF/redo01.log',dbms_logmnr.new); 

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_Logminer(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

SQL> select TABLE_NAME,sql_redo from v$Logminer_contents where SEG_NAME='XIFENFEI';

no rows selected

SQL> EXEC dbms_logmnr.END_Logminer;

PL/SQL procedure successfully completed.

--Logminer无任何记录，证明没有被捕获到

说明:在redo中已经包含了insert操作的相关记录,但是因为没有启用附加日志,是的Logminer不能正常获得相关操作语句

行迁移情况

SQL> alter system switch logfile;

System altered.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949943145

SQL> select member from v$logfile where group# in(
  2  select group# from v$log 
  3  where status='CURRENT');

MEMBER
--------------------------------------------------------------------------------
/u01/oracle/oradata/XFF/redo03.log

--制造行迁移
SQL> update xifenfei set name=lpad('F',4000,'F') WHERE ID=1;

1 row updated.

SQL> update xifenfei set name=lpad('X',4000,'X') WHERE ID=2;

1 row updated.

SQL> update xifenfei set name=lpad('C',4000,'C') WHERE ID=3;

1 row updated.

SQL> commit;

Commit complete.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949943162

SQL> select id,rowid,dbms_rowid.ROWID_RELATIVE_FNO(rowid) file_num,
  2  dbms_rowid.rowid_block_number(rowid) block_num from xifenfei;

        ID ROWID                FILE_NUM  BLOCK_NUM
---------- ------------------ ---------- ----------
         1 AAAMuvAAJAAAAmkAAA          9       2468
         2 AAAMuvAAJAAAAmkAAB          9       2468
         3 AAAMuvAAJAAAAmkAAC          9       2468

SQL> alter system dump datafile 9 block 2472;

System altered.

--dump datablock
Block header dump:  0x024009a4
 Object id on Block? Y
 seg/obj: 0xcbaf  csc: 0x0a.41f6e  itc: 2  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x24009a1 ver: 0x01 opc: 0
     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.02f.00000113  0x00800085.011b.41  --U-    3  fsc 0x000c.00041f78
0x02   0x0003.004.0000014e  0x0080002b.01a6.3b  C---    0  scn 0x000a.0004192d

data_block_dump,data header at 0xec3f464
===============
tsiz: 0x1f98
hsiz: 0x18
pbl: 0x0ec3f464
bdba: 0x024009a4
     76543210
flag=--------
ntab=1
nrow=3
frre=-1
fsbo=0x18
fseo=0x31
avsp=0x19
tosp=0x25
0xe:pti[0]      nrow=3  offs=0
0x12:pri[0]     offs=0xfef
0x14:pri[1]     offs=0x31
0x16:pri[2]     offs=0xfda
block_row_dump:
tab 0, row 0, @0xfef
tl: 4009 fb: --H-FL-- lb: 0x1  cc: 2
col  0: [ 2]  c1 02
col  1: [4000]
 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46
 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46
…………
tab 0, row 1, @0x31
tl: 4009 fb: --H-FL-- lb: 0x1  cc: 2
col  0: [ 2]  c1 03
col  1: [4000]
 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
…………
tab 0, row 2, @0xfda
tl: 9 fb: --H----- lb: 0x1  cc: 0
nrid:  0x024009a8.0    <--发生行迁移，指向下一个迁移数据块
end_of_block_dump
End dump data blocks tsn: 9 file#: 9 minblk 2468 maxblk 2468

--找到下个数据块的block num
SQL> select to_number('9a8','xxxxx') from dual;

TO_NUMBER('9A8','XXXXX')
------------------------
                    2472

SQL> alter system dump datafile 9 block 2472;

System altered.

Block header dump:  0x024009a8
 Object id on Block? Y
 seg/obj: 0xcbaf  csc: 0x0a.3ff09  itc: 3  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x24009a1 ver: 0x01 opc: 0
     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.02f.00000113  0x00800085.011b.40  --U-    1  fsc 0x0000.00041f78
0x02   0x0000.000.00000000  0x00000000.0000.00  ----    0  fsc 0x0000.00000000
0x03   0x0000.000.00000000  0x00000000.0000.00  C---    0  scn 0x0000.00000000

data_block_dump,data header at 0xec3f47c
===============
tsiz: 0x1f80
hsiz: 0x14
pbl: 0x0ec3f47c
bdba: 0x024009a8
     76543210
flag=--------
ntab=1
nrow=1
frre=-1
fsbo=0x14
fseo=0xfd1
avsp=0xfbd
tosp=0xfbd
0xe:pti[0]      nrow=1  offs=0
0x12:pri[0]     offs=0xfd1
block_row_dump:
tab 0, row 0, @0xfd1
tl: 4015 fb: ----FL-- lb: 0x1  cc: 2
hrid: 0x024009a4.2   <--迁移对应的起点数据块
col  0: [ 2]  c1 04
col  1: [4000]
 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
…………
end_of_block_dump
End dump data blocks tsn: 9 file#: 9 minblk 2472 maxblk 2472


SQL> alter system dump logfile '/u01/oracle/oradata/XFF/redo03.log'
  2    scn min 42949943145 scn max 42949943162;

System altered.

--dump redo log
REDO RECORD - Thread:1 RBA: 0x000015.00000002.0010 LEN: 0x1180 VLD: 0x0d
SCN: 0x000a.00041f6e SUBSCN:  1 09/27/2012 00:36:34
CHANGE #1 TYP:2 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.0004192d SEQ:  4 OP:11.5
KTB Redo
op: 0x11  ver: 0x01
op: F  xid:  0x0008.02f.00000113    uba: 0x00800085.011b.3d
Block cleanout record, scn:  0x000a.00041f6e ver: 0x01 opt: 0x02, entries follow...
  itli: 2  flg: 2  scn: 0x000a.0004192d
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 1 ckix: 174
ncol: 2 nnew: 1 size: 3986
col  1: [4000]
 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46
 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46
…………
CHANGE #2 TYP:0 CLS:31 AFN:2 DBA:0x00800079 OBJ:4294967295 SCN:0x000a.00041ebd SEQ:  1 OP:5.2
ktudh redo: slt: 0x002f sqn: 0x00000113 flg: 0x0012 siz: 168 fbi: 0
            uba: 0x00800085.011b.3d    pxid:  0x0000.000.00000000
--OP:5.2 Update rollback segment header

CHANGE #3 TYP:0 CLS:32 AFN:2 DBA:0x00800085 OBJ:4294967295 SCN:0x000a.00041ebc SEQ:  1 OP:5.1
ktudb redo: siz: 168 spc: 862 flg: 0x0012 seq: 0x011b rec: 0x3d
            xid:  0x0008.02f.00000113
ktubl redo: slt: 47 rci: 0 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo        Begin trans    Last buffer split:  No
Temp Object:  No
Tablespace Undo:  No
             0x00000000  prev ctl uba: 0x00800085.011b.3c
prev ctl max cmt scn:  0x000a.000416cd  prev tx cmt scn:  0x000a.000416d0
txn start scn:  0x0000.00000000  logon user: 59  prev brb: 8388734  prev bcl: 0 KDO undo record:
KTB Redo
op: 0x04  ver: 0x01
op: L  itl: xid:  0x0008.019.0000010d uba: 0x00800b85.0111.2f
                      flg: C---    lkc:  0     scn: 0x000a.0003ff0e
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) flag: 0x2c lock: 0 ckix: 174
ncol: 2 nnew: 1 size: -3986
col  1: [16]  77 77 77 2e 78 69 66 65 6e 66 65 69 2e 63 6f 6d

REDO RECORD - Thread:1 RBA: 0x000015.0000000c.0010 LEN: 0x10d4 VLD: 0x05
SCN: 0x000a.00041f71 SUBSCN:  1 09/27/2012 00:36:40
CHANGE #1 TYP:0 CLS:32 AFN:2 DBA:0x00800085 OBJ:4294967295 SCN:0x000a.00041f6e SEQ:  1 OP:5.1
ktudb redo: siz: 104 spc: 692 flg: 0x0022 seq: 0x011b rec: 0x3e
            xid:  0x0008.02f.00000113
ktubu redo: slt: 47 rci: 61 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No
Tablespace Undo:  No
             0x00000000
KDO undo record:
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x00800085.011b.3d
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1) flag: 0x2c lock: 0 ckix: 12
ncol: 2 nnew: 1 size: -3986
col  1: [16]  57 57 57 2e 58 49 46 45 4e 46 45 49 2e 43 4f 4d
CHANGE #2 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.00041f6e SEQ:  1 OP:11.5
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x00800085.011b.3e
KDO Op code: URP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1) flag: 0x2c lock: 1 ckix: 12
ncol: 2 nnew: 1 size: 3986
col  1: [4000]
 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
…………
REDO RECORD - Thread:1 RBA: 0x000015.00000015.010c LEN: 0x1098 VLD: 0x01
SCN: 0x000a.00041f74 SUBSCN:  2 09/27/2012 00:36:46
CHANGE #1 TYP:0 CLS:32 AFN:2 DBA:0x00800085 OBJ:4294967295 SCN:0x000a.00041f74 SEQ:  1 OP:5.1
ktudb redo: siz: 60 spc: 516 flg: 0x0022 seq: 0x011b rec: 0x40
            xid:  0x0008.02f.00000113
ktubu redo: slt: 47 rci: 63 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No
Tablespace Undo:  No
             0x00000000
KDO undo record:
KTB Redo
op: 0x03  ver: 0x01
op: Z
KDO Op code: DRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a8  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0)
CHANGE #2 TYP:0 CLS: 1 AFN:9 DBA:0x024009a8 OBJ:52143 SCN:0x000a.0003ff0e SEQ:  1 OP:11.2
KTB Redo
op: 0x01  ver: 0x01
op: F  xid:  0x0008.02f.00000113    uba: 0x00800085.011b.40
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a8  hdba: 0x024009a3
itli: 1  ispac: 24  maxfr: 4858
tabn: 0 slot: 0(0x0) size/delt: 4015
fb: ----FL-- lb: 0x1  cc: 2   <--这里没有H表明是发生了行迁移过来的记录(对应的flag可以转化为0x0c)
hrid: 0x024009a4.2
null: --
col  0: [ 2]  c1 04
col  1: [4000]
 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
…………
REDO RECORD - Thread:1 RBA: 0x000015.0000001e.0078 LEN: 0x0124 VLD: 0x01
SCN: 0x000a.00041f74 SUBSCN:  3 09/27/2012 00:36:46
CHANGE #1 TYP:0 CLS:32 AFN:2 DBA:0x00800085 OBJ:4294967295 SCN:0x000a.00041f74 SEQ:  2 OP:5.1
ktudb redo: siz: 124 spc: 454 flg: 0x0022 seq: 0x011b rec: 0x41
            xid:  0x0008.02f.00000113
ktubu redo: slt: 47 rci: 64 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No
Tablespace Undo:  No
             0x00000000
KDO undo record:
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x00800085.011b.3f
KDO Op code: ORP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2) size/delt: 21
fb: --H-FL-- lb: 0x1  cc: 2
null: --
col  0: [ 2]  c1 04
col  1: [14]  77 77 77 2e 6f 72 61 73 6f 73 2e 63 6f 6d
CHANGE #2 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.00041f74 SEQ:  1 OP:11.6
KTB Redo
op: 0x02  ver: 0x01
op: C  uba: 0x00800085.011b.41
KDO Op code: ORP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 1  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2) size/delt: 9
fb: --H----- lb: 0x1  cc: 0  <--这里可以看到对应的块只有header信息无L,也就是发生了行迁移
nrid:  0x024009a8.0   <--通block dump说明
null:
--OP:11.6 Overwrite Row Piece 

--Logminer操作
SQL> conn / as sysdba
Connected.
SQL> exec dbms_logmnr.add_logfile('/u01/oracle/oradata/XFF/redo03.log',dbms_logmnr.new);  

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_Logminer(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.


SQL> EXEC dbms_logmnr.END_Logminer;

PL/SQL procedure successfully completed.

SQL> col sql_redo for a80
SQL> col TABLE_NAME for a15
SQL> set lines 134
SQL> select TABLE_NAME,sql_redo from v$Logminer_contents where scn>=42949943145 and scn<=42949943162;

TABLE_NAME      SQL_REDO
--------------- --------------------------------------------------------------------------------

XIFENFEI        update "CHF"."XIFENFEI" set "NAME" = 'XXXX……XXXXX' where "NAME" = 'WWW.XIFENFEI.COM' 
                and ROWID = 'AAAMuvAAJAAAAmkAAB';
XIFENFEI        Unsupported
XIFENFEI        Unsupported
XIFENFEI        update "CHF"."XIFENFEI" set "ID" = NULL, "NAME" = NULL where "ID" = '3' and "NAM
                E" = 'www.orasos.com' and ROWID = 'AAAMuvAAJAAAAmkAAC';
                commit;
7 rows selected.

SQL> EXEC dbms_logmnr.END_Logminer;

PL/SQL procedure successfully completed.

--获得了第二条记录(第一条没有任何记录,第三条因为行迁移,所以出现了update更新相关列为null,从而没有被Logminer正在的捕获)

说明：1)在发生行迁移之时,Logminer不能获得正常的sql语句,而是直接提示Unsupported;2)不发生行迁移也不一定能够获得update语句

删除操作

SQL> conn chf/xifenfei
Connected.
SQL> alter system switch logfile;

System altered.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949953508

SQL> select member from v$logfile where group# in(
  2  select group# from v$log 
  3  where status='CURRENT');

MEMBER
--------------------------------------------------------------------------------
/u01/oracle/oradata/XFF/redo01.log

SQL> delete from xifenfei where id=1;

1 row deleted.

SQL> delete from xifenfei where id=2;

1 row deleted.

SQL> delete from xifenfei where id=3;

1 row deleted.

SQL> commit;

Commit complete.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949953524

--原始数据所在block
SQL> alter system dump datafile 9 block 2468;

System altered.

--发生行迁移的block
SQL> alter system dump datafile 9 block 2472;

System altered.

--dump block 内容
Block header dump:  0x024009a4
 Object id on Block? Y
 seg/obj: 0xcbaf  csc: 0x0a.447e9  itc: 2  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x24009a1 ver: 0x01 opc: 0
     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.02f.00000113  0x00800085.011b.41  C---    0  scn 0x000a.00041f78
0x02   0x0004.014.000000da  0x00800398.00bf.02  --U-    3  fsc 0x1f55.000447f2

data_block_dump,data header at 0xdcb9464
===============
tsiz: 0x1f98
hsiz: 0x18
pbl: 0x0dcb9464
bdba: 0x024009a4
     76543210
flag=--------
ntab=1
nrow=3
frre=-1
fsbo=0x18
fseo=0x31
avsp=0x25
tosp=0x1f80
0xe:pti[0]      nrow=3  offs=0
0x12:pri[0]     offs=0xfef
0x14:pri[1]     offs=0x31
0x16:pri[2]     offs=0xfda
block_row_dump:
tab 0, row 0, @0xfef
tl: 2 fb: --HDFL-- lb: 0x2
tab 0, row 1, @0x31
tl: 2 fb: --HDFL-- lb: 0x2
tab 0, row 2, @0xfda
tl: 2 fb: --HD---- lb: 0x2


Block header dump:  0x024009a8
 Object id on Block? Y
 seg/obj: 0xcbaf  csc: 0x0a.447ef  itc: 3  flg: E  typ: 1 - DATA
     brn: 0  bdba: 0x24009a1 ver: 0x01 opc: 0
     inc: 0  exflg: 0

 Itl           Xid                  Uba         Flag  Lck        Scn/Fsc
0x01   0x0008.02f.00000113  0x00800085.011b.40  C---    0  scn 0x000a.00041f78
0x02   0x0004.014.000000da  0x00800399.00bf.01  --U-    1  fsc 0x0fad.000447f2
0x03   0x0000.000.00000000  0x00000000.0000.00  C---    0  scn 0x0000.00000000

data_block_dump,data header at 0xdcb947c
===============
tsiz: 0x1f80
hsiz: 0x14
pbl: 0x0dcb947c
bdba: 0x024009a8
     76543210
flag=--------
ntab=1
nrow=1
frre=-1
fsbo=0x14
fseo=0xfd1
avsp=0xfbd
tosp=0x1f6c
0xe:pti[0]      nrow=1  offs=0
0x12:pri[0]     offs=0xfd1
block_row_dump:
tab 0, row 0, @0xfd1
tl: 2 fb: ---DFL-- lb: 0x2
end_of_block_dump
--通过数据块dump证明，记录确实已经被删除

--dump redo logfile
SQL> alter system dump logfile '/u01/oracle/oradata/XFF/redo01.log'
  2    scn min 42949953508 scn max 42949953524;

System altered.

--dump redolog
REDO RECORD - Thread:1 RBA: 0x000016.0000000b.0010 LEN: 0x1170 VLD: 0x0d
SCN: 0x000a.000447e9 SUBSCN:  1 09/27/2012 20:03:36
CHANGE #1 TYP:2 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.00041f78 SEQ:  1 OP:11.3
KTB Redo 
op: 0x11  ver: 0x01  
op: F  xid:  0x0004.014.000000da    uba: 0x00800397.00bf.06
Block cleanout record, scn:  0x000a.000447e9 ver: 0x01 opt: 0x02, entries follow...
  itli: 1  flg: 2  scn: 0x000a.00041f78
KDO Op code: DRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0)
--OP:11.3 Drop Row Piece

CHANGE #2 TYP:0 CLS:23 AFN:2 DBA:0x00800039 OBJ:4294967295 SCN:0x000a.000447ae SEQ:  1 OP:5.2
ktudh redo: slt: 0x0014 sqn: 0x000000da flg: 0x0012 siz: 4172 fbi: 0
            uba: 0x00800397.00bf.06    pxid:  0x0000.000.00000000
CHANGE #3 TYP:0 CLS:24 AFN:2 DBA:0x00800397 OBJ:4294967295 SCN:0x000a.000447ad SEQ:  1 OP:5.1
ktudb redo: siz: 4172 spc: 5804 flg: 0x0012 seq: 0x00bf rec: 0x06
            xid:  0x0004.014.000000da  
ktubl redo: slt: 20 rci: 0 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo        Begin trans    Last buffer split:  No 
Temp Object:  No 
Tablespace Undo:  No 
             0x00000000  prev ctl uba: 0x00800397.00bf.05 
prev ctl max cmt scn:  0x000a.00043852  prev tx cmt scn:  0x000a.00043862 
txn start scn:  0x0000.00000000  logon user: 59  prev brb: 8389522  prev bcl: 0 KDO undo record:
KTB Redo 
op: 0x04  ver: 0x01  
op: L  itl: xid:  0x0003.004.0000014e uba: 0x0080002b.01a6.3b
                      flg: C---    lkc:  0     scn: 0x000a.0004192d
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) size/delt: 4009
fb: --H-FL-- lb: 0x0  cc: 2
null: --
col  0: [ 2]  c1 02
col  1: [4000]
 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46
 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46 46
…………
REDO RECORD - Thread:1 RBA: 0x000016.00000014.0010 LEN: 0x0044 VLD: 0x01
SCN: 0x000a.000447e9 SUBSCN:  1 09/27/2012 20:03:36
CHANGE #1 TYP:0 CLS: 8 AFN:9 DBA:0x024009a1 OBJ:52143 SCN:0x000a.00041f74 SEQ:  1 OP:13.22
Redo on Level1 Bitmap Block
Redo for state change
Len: 1 Offset: 3 newstate: 3
 
REDO RECORD - Thread:1 RBA: 0x000016.00000015.0010 LEN: 0x1100 VLD: 0x05
SCN: 0x000a.000447ed SUBSCN:  1 09/27/2012 20:03:42
CHANGE #1 TYP:0 CLS:23 AFN:2 DBA:0x00800039 OBJ:4294967295 SCN:0x000a.000447e9 SEQ:  1 OP:5.2
ktudh redo: slt: 0x0014 sqn: 0x00000000 flg: 0x000a siz: 4108 fbi: 80
            uba: 0x00800398.00bf.01    pxid:  0x0000.000.00000000
CHANGE #2 TYP:1 CLS:24 AFN:2 DBA:0x00800398 OBJ:4294967295 SCN:0x000a.000447ec SEQ:  1 OP:5.1
ktudb redo: siz: 4108 spc: 1630 flg: 0x000a seq: 0x00bf rec: 0x01
            xid:  0x0004.014.000000da  
ktubu redo: slt: 20 rci: 0 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No 
Tablespace Undo:  No 
             0x00800397
KDO undo record:
KTB Redo 
op: 0x02  ver: 0x01  
op: C  uba: 0x00800397.00bf.06
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1) size/delt: 4009
fb: --H-FL-- lb: 0x0  cc: 2
null: --
col  0: [ 2]  c1 03
col  1: [4000]
 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58
…………
CHANGE #3 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.000447e9 SEQ:  1 OP:11.3
KTB Redo 
op: 0x02  ver: 0x01  
op: C  uba: 0x00800398.00bf.01
KDO Op code: DRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 1(0x1)
 
REDO RECORD - Thread:1 RBA: 0x000016.0000001d.0190 LEN: 0x0044 VLD: 0x01
SCN: 0x000a.000447ed SUBSCN:  1 09/27/2012 20:03:42
CHANGE #1 TYP:0 CLS: 8 AFN:9 DBA:0x024009a1 OBJ:52143 SCN:0x000a.000447e9 SEQ:  1 OP:13.22
Redo on Level1 Bitmap Block
Redo for state change
Len: 1 Offset: 3 newstate: 5
 
REDO RECORD - Thread:1 RBA: 0x000016.0000001e.0010 LEN: 0x0118 VLD: 0x05
SCN: 0x000a.000447ee SUBSCN:  1 09/27/2012 20:03:45
CHANGE #1 TYP:0 CLS:24 AFN:2 DBA:0x00800398 OBJ:4294967295 SCN:0x000a.000447ed SEQ:  1 OP:5.1
ktudb redo: siz: 96 spc: 4040 flg: 0x0022 seq: 0x00bf rec: 0x02
            xid:  0x0004.014.000000da  
ktubu redo: slt: 20 rci: 1 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No 
Tablespace Undo:  No 
             0x00000000
KDO undo record:
KTB Redo 
op: 0x02  ver: 0x01  
op: C  uba: 0x00800398.00bf.01
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2) size/delt: 9
fb: --H----- lb: 0x0  cc: 0
nrid:  0x024009a8.0
null: 
CHANGE #2 TYP:0 CLS: 1 AFN:9 DBA:0x024009a4 OBJ:52143 SCN:0x000a.000447ed SEQ:  1 OP:11.3
KTB Redo 
op: 0x02  ver: 0x01  
op: C  uba: 0x00800398.00bf.02
KDO Op code: DRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a4  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 2(0x2)
 
REDO RECORD - Thread:1 RBA: 0x000016.0000001e.0128 LEN: 0x10fc VLD: 0x01
SCN: 0x000a.000447f0 SUBSCN:  1 09/27/2012 20:03:45
CHANGE #1 TYP:0 CLS:23 AFN:2 DBA:0x00800039 OBJ:4294967295 SCN:0x000a.000447ed SEQ:  1 OP:5.2
ktudh redo: slt: 0x0014 sqn: 0x00000000 flg: 0x000a siz: 4100 fbi: 84
            uba: 0x00800399.00bf.01    pxid:  0x0000.000.00000000
CHANGE #2 TYP:1 CLS:24 AFN:2 DBA:0x00800399 OBJ:4294967295 SCN:0x000a.000447ef SEQ:  1 OP:5.1
ktudb redo: siz: 4100 spc: 3942 flg: 0x000a seq: 0x00bf rec: 0x01
            xid:  0x0004.014.000000da  
ktubu redo: slt: 20 rci: 0 opc: 11.1 objn: 52143 objd: 52143 tsn: 9
Undo type:  Regular undo       Undo type:  Last buffer split:  No 
Tablespace Undo:  No 
             0x00800398
KDO undo record:
KTB Redo 
op: 0x03  ver: 0x01  
op: Z
KDO Op code: IRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a8  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0) size/delt: 4015
fb: ----FL-- lb: 0x0  cc: 2
hrid: 0x024009a4.2
null: --
col  0: [ 2]  c1 04
col  1: [4000]
 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43
…………
CHANGE #3 TYP:2 CLS: 1 AFN:9 DBA:0x024009a8 OBJ:52143 SCN:0x000a.00041f78 SEQ:  1 OP:11.3
KTB Redo 
op: 0x11  ver: 0x01  
op: F  xid:  0x0004.014.000000da    uba: 0x00800399.00bf.01
Block cleanout record, scn:  0x000a.000447ef ver: 0x01 opt: 0x02, entries follow...
  itli: 1  flg: 2  scn: 0x000a.00041f78
KDO Op code: DRP row dependencies Disabled
  xtype: XA flags: 0x00000000  bdba: 0x024009a8  hdba: 0x024009a3
itli: 2  ispac: 0  maxfr: 4858
tabn: 0 slot: 0(0x0)
 
REDO RECORD - Thread:1 RBA: 0x000016.00000027.00b4 LEN: 0x0044 VLD: 0x01
SCN: 0x000a.000447f0 SUBSCN:  1 09/27/2012 20:03:45
CHANGE #1 TYP:0 CLS: 8 AFN:9 DBA:0x024009a1 OBJ:52143 SCN:0x000a.000447ed SEQ:  1 OP:13.22
Redo on Level1 Bitmap Block
Redo for state change
Len: 1 Offset: 7 newstate: 5
--可以看到redo部分没有太多记录,而undo部分的信息比较全(因为是delete操作)

--Logminer操作
SQL> conn / as sysdba
Connected.
SQL> exec dbms_logmnr.add_logfile('/u01/oracle/oradata/XFF/redo01.log',dbms_logmnr.new);  

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_Logminer(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

SQL> select sql_redo from v$Logminer_contents where SEG_NAME='XIFENFEI';

SQL_REDO
--------------------------------------------------------------------------------
delete from "CHF"."XIFENFEI" where "ID" = '2' and "NAME" = 'XXXXXXXXXXXXXXXXXXXX
…………
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' and ROWID = 'AAAMu
vAAJAAAAmkAAB';
Unsupported
Unsupported

SQL> EXEC dbms_logmnr.END_Logminer;

PL/SQL procedure successfully completed.
--也只是捕获了第二条记录,第一条无任何信息,第三条因为行迁移所以提示Unsupported

说明:我们可以看到对于delete操作,有部分不能被Logminer正常捕获,行迁移的直接提示Unsupported

启用数据库附加日志

SQL> conn chf/xifenfei
Connected.
SQL> drop table xifenfei purge;

Table dropped.

SQL> alter database add supplemental log data;

Database altered.

SQL> alter system switch logfile;

System altered.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949959788

SQL> select member from v$logfile where group# in(
  2  select group# from v$log where status='CURRENT');

MEMBER
--------------------------------------------------------------------------------
/u01/oracle/oradata/XFF/redo02.log

SQL> create table xifenfei(id number,name varchar2(4000));

Table created.

SQL> insert into xifenfei values(1,'xifenfei');

1 row created.

SQL> insert into xifenfei values(2,'XIFENFEI');

1 row created.

SQL> insert into xifenfei values(3,'XiFenFei');

1 row created.

SQL> commit;

Commit complete.

SQL> update xifenfei set name='www.orasos.com' where id=1;

1 row updated.

SQL> update xifenfei set name='WWW.XIFENFEI.COM' WHERE ID=2;

1 row updated.

SQL> update xifenfei set name='www.orasos.com' where id=3;

1 row updated.

SQL> commit;

Commit complete.

SQL> update xifenfei set name=lpad('F',4000,'F') WHERE ID=1;

1 row updated.

SQL> update xifenfei set name=lpad('X',4000,'X') WHERE ID=2;

1 row updated.

SQL> update xifenfei set name=lpad('C',4000,'C') WHERE ID=3;

1 row updated.

SQL> commit;

Commit complete.

SQL> delete from xifenfei where id=1;

1 row deleted.

SQL> delete from xifenfei where id=2;

1 row deleted.

SQL> delete from xifenfei where id=3;

1 row deleted.

SQL> commit;

Commit complete.

SQL> select to_char(dbms_flashback.get_system_change_number,'9999999999999') scn from dual;

SCN
--------------
   42949959845

SQL> conn / as sysdba
Connected.
SQL> exec dbms_logmnr.add_logfile('/u01/oracle/oradata/XFF/redo02.log',dbms_logmnr.new);  

PL/SQL procedure successfully completed.

SQL> exec dbms_logmnr.start_Logminer(options=>dbms_logmnr.dict_from_online_catalog);

PL/SQL procedure successfully completed.

SQL> select sql_redo from v$Logminer_contents where SEG_NAME='XIFENFEI';

SQL_REDO
--------------------------------------------------------------------------------
create table xifenfei(id number,name varchar2(4000));
insert into "CHF"."XIFENFEI"("ID","NAME") values ('1','xifenfei');
insert into "CHF"."XIFENFEI"("ID","NAME") values ('2','XIFENFEI');
insert into "CHF"."XIFENFEI"("ID","NAME") values ('3','XiFenFei');
update "CHF"."XIFENFEI" set "NAME" = 'www.orasos.com' where "NAME" = 'xifenfei
' and ROWID = 'AAAMwEAAJAAAAmkAAA';
update "CHF"."XIFENFEI" set "NAME" = 'WWW.XIFENFEI.COM' where "NAME" = 'XIFENFEI
' and ROWID = 'AAAMwEAAJAAAAmkAAB';
update "CHF"."XIFENFEI" set "NAME" = 'www.orasos.com' where "NAME" = 'XiFenFei'
and ROWID = 'AAAMwEAAJAAAAmkAAC';
update "CHF"."XIFENFEI" set "NAME" = 'FFFFFFF…………FFFF' where 
"NAME" = 'www.orasos.com' and ROWID = 'AAAMwEAAJAAAAmkAAA';
update "CHF"."XIFENFEI" set "NAME" = 'XXXXXXXXX…………XX' where 
"NAME" = 'WWW.XIFENFEI.COM' and ROWID = 'AAAMwEAAJAAAAmkAAB';
update "CHF"."XIFENFEI" set "ID" = '3', "NAME" = 'CCCCC…………CCCCCCCCC' 
where "ID" = '3' and "NAME"= 'www.orasos.com' and ROWID = 'AAAMwEAAJAAAAmkAAC';
delete from "CHF"."XIFENFEI" where "ID" = '1' and "NAME" = 'FFFFFF…………FF' 
and ROWID = 'AAAMwEAAJAAAAmkAAA';
delete from "CHF"."XIFENFEI" where "ID" = '2' and "NAME" = 'XX…………XXX' 
and ROWID = 'AAAMwEAAJAAAAmkAAB';
delete from "CHF"."XIFENFEI" where "ID" = '3' and "NAME" = 'CCCCCCCC…………CCC' 
and ROWID = 'AAAMwEAAJAAAAmkAAC';

19 rows selected.

测试证明,启动附加日志后,数据库的相关操作都能够捕获,包括行迁移