本實驗模擬使用ODU恢復被DROP掉的表的恢復，有關ODU軟件的下載和使用說明詳見老熊的BLOG http://www.laoxiong.net

本實驗以上一篇文章《使用ODU恢復被TRUNCATE的表分區》為基礎，延用測試表，該測試表有4個分區，每個分區一條記錄。

SQL> select * from dbdream;

ID NAME?????? TEST

---------- ---------- --------------------

1 dbdream??? is test

2 stream???? yes

3 wind?????? no

4 chunfeng?? ttt

SQL> select * from dbdream partition(part1);

ID NAME?????? TEST

---------- ---------- --------------------

1 dbdream??? is test

SQL> select * from dbdream partition(part2)

ID NAME?????? TEST

---------- ---------- --------------------

2 stream???? yes

SQL> select * from dbdream partition(part3)

ID NAME?????? TEST

---------- ---------- --------------------

3 wind?????? no

SQL> select * from dbdream partition(part4)

ID NAME?????? TEST

---------- ---------- --------------------

4 chunfeng?? ttt

DROP表

SQL> DROP TABLE DBDREAM PURGE;

Table dropped.

查詢被DROP掉的表的OBJECT ID

如果這個表的元數據信息在SYSTEM回滾段內沒有被清除，可以通過閃回查詢到該表的OBJECT ID等信息。

SQL> select obj# || ',' || dataobj# || ',' || owner# || ',' || name || ',' || subname || ',' || type# text from sys.obj$ as of timestamp(to_date('2012-11-29 17:50:00','yyyy-mm-dd hh24:mi:ss')) where name='DBDREAM';

TEXT

-----------------------------------------------------------------------------

46249,46249,45,DBDREAM,PART1,19

46250,46250,45,DBDREAM,PART2,19

46251,46251,45,DBDREAM,PART3,19

46252,46252,45,DBDREAM,PART4,19

46248,,45,DBDREAM,,2

登錄ODU

[oracle@10205 odu]$ ./odu

Oracle Data Unloader:Release 3.0.8

Copyright (c) 2008,2009 XiongJun. All rights reserved.

Web: http://www.laoxiong.net

Email: magic007cn@gmail.com

loading default config.......

byte_order little

block_size? 8192

db_timezone -7

client_timezone 8

data_path?? data

charset_name ZHS16GBK

ncharset_name AL16UTF16

output_format dmp

lob_storage infile

clob_byte_order little

load control file 'config.txt' successful

loading default control file ......

ts#?? fn? rfn bsize?? blocks bf offset filename

---- ---- ---- ----- -------- -- ------ -------------------------------------

0??? 1??? 1? 8192??? 48640 N?????? 0 /u01/app/oracle/oradata/orac/system01.dbf

4??? 4??? 4? 8192????? 640 N?????? 0 /u01/app/oracle/oradata/orac/users01.dbf

load control file 'control.txt' successful

loading dictionary data......

抽取數據字典

ODU> unload dict

CLUSTER C_USER# file_no: 1 block_no: 89

TABLE OBJ$ file_no: 1 block_no: 121

CLUSTER C_OBJ# file_no: 1 block_no: 25

CLUSTER C_OBJ# file_no: 1 block_no: 25

found IND$'s obj# 19

found IND$'s dataobj#:2,ts#:0,file#:1,block#:25,tab#:3

found TABPART$'s obj# 266

found TABPART$'s dataobj#:266,ts#:0,file#:1,block#:2121,tab#:0

found INDPART$'s obj# 271

found INDPART$'s dataobj#:271,ts#:0,file#:1,block#:2161,tab#:0

found TABSUBPART$'s obj# 278

found TABSUBPART$'s dataobj#:278,ts#:0,file#:1,block#:2217,tab#:0

found INDSUBPART$'s obj# 283

found INDSUBPART$'s dataobj#:283,ts#:0,file#:1,block#:2257,tab#:0

found IND$'s obj# 19

found IND$'s dataobj#:2,ts#:0,file#:1,block#:25,tab#:3

found LOB$'s obj# 151

found LOB$'s dataobj#:2,ts#:0,file#:1,block#:25,tab#:6

found LOBFRAG$'s obj# 299

found LOBFRAG$'s dataobj#:299,ts#:0,file#:1,block#:2393,tab#:0

掃描數據文件

此步驟如果不執行，可能UNLOAD出來的結果不準確。

ODU> scan extent

scan extent start: 2012-11-29 22:58:34

scanning extent...

scanning extent finished.

scan extent completed: 2012-11-29 22:58:34

抽取數據

ODU> unload object 46249 tablespace 4 column NUMBER VARCHAR2 VARCHAR2

Unloading Object,object ID: 46249,? Cluster: 0

1 rows unloaded

ODU> unload object 46250 tablespace 4 column NUMBER VARCHAR2 VARCHAR2

Unloading Object,object ID: 46250,? Cluster: 0

1 rows unloaded

ODU> unload object 46251 tablespace 4 column NUMBER VARCHAR2 VARCHAR2

Unloading Object,object ID: 46251,? Cluster: 0

1 rows unloaded

ODU> unload object 46252 tablespace 4 column NUMBER VARCHAR2 VARCHAR2

Unloading Object,object ID: 46252,? Cluster: 0

1 rows unloaded

查看DMP文件

[oracle@10205 data]$ ls *.dmp

ODU_0000046249.dmp? ODU_0000046251.dmp? ODU_0000046252.dmp? ODU_0000046250.dmp

恢復數據

[oracle@10205 data]$ imp scott/tiger file=ODU_0000046249.dmp full=y

[oracle@10205 data]$ imp scott/tiger file=ODU_0000046252.dmp full=y

[oracle@10205 data]$ imp scott/tiger file=ODU_0000046251.dmp full=y

[oracle@10205 data]$ imp scott/tiger file=ODU_0000046250.dmp full=y

查詢

由于不知道被DROP表的元數據，ODU恢復的數據是按照ODU的規則建立表結構。

SQL> select * from tab;

TNAME????????????????????????? TABTYPE? CLUSTERID

------------------------------ ------- ----------

ODU_0000046249???????????????? TABLE

ODU_0000046252???????????????? TABLE

ODU_0000046251???????????????? TABLE

ODU_0000046250???????????????? TABLE

10.描述表結構

SQL> desc ODU_0000046251

Name?????????????????????? ???????????????Null???? Type

----------------------------------------- -------- ---------------------

C0001????????????????????????????????????????????? NUMBER

C0002????????????????????????????????????????????? VARCHAR2(4000)

C0003???????????????????? ?????????????????????????VARCHAR2(4000)

11.重建測試表表結構

SQL> create table dbdream(id number,name varchar2(10),test varchar2(20))

2? partition by list (id)

3? (

4? partition part1 values(1),

5? partition part2 values(2),

6? partition part3 values(3),

7? partition part4 values(default));

Table created.

12.將數據插入到新表

SQL> insert into DBDREAM select * from ODU_0000046249;

1 row created.

SQL> c/ODU_0000046249/ODU_0000046251

1* insert into DBDREAM select * from ODU_0000046251

SQL> /

1 row created.

SQL> c/ODU_0000046251/ODU_0000046252

1* insert into DBDREAM select * from ODU_0000046252

SQL> /

1 row created.

SQL> c/ODU_0000046252/ODU_0000046250

1* insert into DBDREAM select * from ODU_0000046250

SQL> /

1 row created.

SQL> commit;

Commit complete.

13.查詢新表數據

SQL> select * from dbdream;

ID NAME?????? TEST

---------- ---------- --------------------

1 dbdream??? is test

2 stream???? yes

3 wind?????? no

4 chunfeng?? ttt

SQL> a? partition (part1);

1* select * from dbdream partition (part1)

SQL> /

ID NAME?????? TEST

---------- ---------- --------------------

1 dbdream??? is test

SQL> c/part1/part2

1* select * from dbdream partition (part2)

SQL> /

ID NAME?????? TEST

---------- ---------- --------------------

2 stream???? yes

SQL> c/part2/part3

1* select * from dbdream partition (part3)

SQL> /

ID NAME?????? TEST

---------- ---------- --------------------

3 wind?????? no

SQL> c/part3/part4

1* select * from dbdream partition (part4)

SQL> /

ID NAME?????? TEST

---------- ---------- --------------------

4 chunfeng?? ttt

14.刪除ODU規則命名的表

SQL> drop table ODU_0000046249 purge;

Table dropped.

SQL> drop table ODU_0000046250 purge;

Table dropped.

SQL> drop table ODU_0000046251 purge;

Table dropped.

SQL> drop table ODU_0000046252 purge;

Table dropped.

至此，使用ODU恢復被DROP的表的操作完成。

總結

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