案例:Oracle dul数据挖掘 没有数据库备份非常规恢复truncate删除的数据表
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Oracle数据库在没有备份情况下在对表中的某数据表进行truncate删除后，通过oracle dul进行非常规恢复
1.准备oracle dul测试环境
SQL> select count(*) from t_xifenfei;
COUNT(*)
----------
67854
SQL> desc t_xifenfei
Name Null? Type
----------------------------------------- -------- ----------------------------
OWNER VARCHAR2(30)
OBJECT_NAME VARCHAR2(128)
SUBOBJECT_NAME VARCHAR2(30)
OBJECT_ID NUMBER
DATA_OBJECT_ID NUMBER
OBJECT_TYPE VARCHAR2(19)
CREATED DATE
LAST_DDL_TIME DATE
TIMESTAMP VARCHAR2(19)
STATUS VARCHAR2(7)
TEMPORARY VARCHAR2(1)
GENERATED VARCHAR2(1)
SECONDARY VARCHAR2(1)
NAMESPACE NUMBER
EDITION_NAME VARCHAR2(30)
SQL> select object_id,data_object_id from user_objects where object_name=‘T_XIFENFEI‘;
OBJECT_ID DATA_OBJECT_ID
---------- --------------
68332 68332
SQL> TRUNCATE TABLE T_XIFENFEI;
Table truncated.
SQL> ALTER SYSTEM CHECKPOINT;
System altered.
SQL> select object_id,data_object_id from user_objects where object_name=‘T_XIFE
NFEI‘;
OBJECT_ID DATA_OBJECT_ID
---------- --------------
68332 68468
SQL> SELECT TABLESPACE_NAME FROM DBA_SEGMENTS WHERE SEGMENT_NAME=‘T_XIFENFEI‘;
TABLESPACE_NAME
------------------------------
USERS
SQL> SELECT FILE_ID FROM DBA_DATA_FILES WHERE TABLESPACE_NAME=‘USERS‘;
FILE_ID
----------
4
SQL> SELECT file#,RFILE#,NAME FROM V$DATAFILE;
FILE# RFILE# NAME
---------- ---------- --------------------------------------------------
1 1 E:\ORACLE\ORADATA\XIFENFEI\SYSTEM01.DBF
2 2 E:\ORACLE\ORADATA\XIFENFEI\SYSAUX01.DBF
3 3 E:\ORACLE\ORADATA\XIFENFEI\UNDOTBS01.DBF
4 4 E:\ORACLE\ORADATA\XIFENFEI\USERS01.DBF
5 5 E:\ORACLE\ORADATA\XIFENFEI\UNDO01.DBF
6 6 E:\ORACLE\ORADATA\XIFENFEI\CZUM01.DBF
6 rows selected.
备注说明：因为我们为了测试，所以直接查询出来了data_object_id，在实际的恢复中，我们需要使用logminer来找出来历史dataobj#
2.dul恢复truncate 表
e:\dul10>dul.exe
Data UnLoader 10.2.4.37 - Oracle Internal Only - on Mon Feb 04 00:20:08 2013
with 64-bit io functions
Copyright (c) 1994 2010 Bernard van Duijnen All rights reserved.
Strictly Oracle Internal use Only
DUL: Warning: Recreating file "dul.log"
Reading USER.dat 65 entries loaded
Reading OBJ.dat 67944 entries loaded and sorted 67944 entries
Reading SCANNEDLOBPAGE.dat 8 entries loaded and sorted 8 entries
Reading TAB.dat 1869 entries loaded
Reading COL.dat 77409 entries loaded and sorted 77409 entries
Reading SEG.dat 23 entries loaded
Reading EXT.dat 54 entries loaded and sorted 54 entries
Reading TABPART.dat 110 entries loaded and sorted 110 entries
Reading TABCOMPART.dat 1 entries loaded and sorted 1 entries
Reading TABSUBPART.dat 32 entries loaded and sorted 32 entries
Reading INDPART.dat 127 entries loaded and sorted 127 entries
Reading INDCOMPART.dat 0 entries loaded and sorted 0 entries
Reading INDSUBPART.dat 0 entries loaded and sorted 0 entries
Reading IND.dat 3729 entries loaded
Reading LOB.dat
DUL: Warning: Increased the size of DC_LOBS from 1024 to 8192 entries
1109 entries loaded
Reading ICOL.dat 4868 entries loaded
Reading COLTYPE.dat 2823 entries loaded
Reading TYPE.dat 2082 entries loaded
Reading ATTRIBUTE.dat 8736 entries loaded
Reading COLLECTION.dat 591 entries loaded
Reading COMPATSEG.dat 0 entries loaded
Reading BOOTSTRAP.dat 60 entries loaded
Reading LOBFRAG.dat 1 entries loaded and sorted 1 entries
Reading LOBCOMPPART.dat 0 entries loaded and sorted 0 entries
Reading UNDO.dat 24 entries loaded
Reading TS.dat 7 entries loaded
Reading PROPS.dat 36 entries loaded
Database character set is ZHS16GBK
Database national character set is AL16UTF16
Found db_id = 1422012639
Found db_name = XIFENFEI
DUL> SCAN DATAFILE 4;
DUL: Warning: Recreating file "EXT.dat"
DUL: Warning: Recreating file "SEG.dat"
DUL: Warning: Recreating file "COMPATSEG.dat"
DUL: Warning: Recreating file "SCANNEDLOBPAGE.dat"
Scanning tablespace 4, data file 4 ...
23 segment header and 1601 data blocks
tablespace 4, data file 4: 2079 blocks scanned
Reading EXT.dat 54 entries loaded and sorted 54 entries
Reading SEG.dat 23 entries loaded
Reading COMPATSEG.dat 0 entries loaded
Reading SCANNEDLOBPAGE.dat 8 entries loaded and sorted 8 entries
DUL> ALTER SESSION SET USE_SCANNED_EXTENT_MAP = TRUE;
Parameter altered
DUL> scan extents;
DUL: Warning: Recreating file "seen_tab.dat"
DUL: Warning: Recreating file "seen_col.dat"
Scanning extents without segment header
Scanning extent id (dba 0, obj 68332)
Analyzing segment: data object id 68332
heap organized table
Col Seen Max PCT PRINT NUMBERS DATES TIMESTAMP WITH TZ INTRVAL ROWIDS LOB
no count Size NUL 75%100% AnyNice AnyNice AnyNice AnyNice Y2M D2S AnyNice
1 67854 18 0 100 100 0 0 0 0 0 0 0 0 0 0 44 0 0
…………
14 67854 2 0 0 0 100 100 0 0 0 0 0 0 0 0 0 0 0
|SYS| |C_FILE#_BLOCK#| || |8| |8| |CLUSTER| |20-JAN-2013 AD 17:13:18| |20-JAN-20
…………
:18| |2013-01-20:17:13:18| |VALID| |N| |N| |N| |1|
UNLOAD TABLE OBJNO68332 ( COL001 VARCHAR2(18), COL002 VARCHAR2(30), COL003 VARCH
AR2(27)
, COL004 NUMBER, COL005 NUMBER, COL006 VARCHAR2(18), COL007 DATE
, COL008 DATE, COL009 VARCHAR2(19), COL010 VARCHAR2(7), COL011 VARCHAR2(
1)
, COL012 VARCHAR2(1), COL013 VARCHAR2(1), COL014 NUMBER )
STORAGE( DATAOBJNO 68332 );
--自己拼接语句
DUL> UNLOAD TABLE t_xifenfei_1(OWNER VARCHAR2(30),OBJECT_NAME VARCHAR2(128),SUB
OBJECT_NAME VARCHAR2(30),OBJECT_ID NUMBER,DATA_OBJECT_ID NUMBER,OBJECT_TY
PE VARCHAR2(19),CREATED DATE,LAST_DDL_TIME DATE,TIMESTAMP VARCHAR2(19),ST
ATUS VARCHAR2(7),TEMPORARY VARCHAR2(1),GENERATED VARCHAR2(1),SECONDARY
VARCHAR2(1),NAMESPACE NUMBER,EDITION_NAME VARCHAR2(30)) STORAGE( DATAOBJNO 6
8332 );
. unloading table T_XIFENFEI_1
DUL: Warning: Recreating file "T_XIFENFEI_1.ctl"
67854 rows unloaded
补充说明：
1.在最新的dul 10.2.0.5.20中，不支持scan extents命令
2.在最新的dul 10.2.0.5.20中，挖出来的无数据字典数据，字符串转换为16进制值
--------------------------------------ORACLE-DBA----------------------------------------
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Oracle dul数据挖掘
没有数据库备份非常规恢复truncate删除的数据表
案例:Oracle dul数据挖掘 没有数据库备份非常规恢复truncate删除的数据表
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