Oracle Drop 表(purge )恢復 (ODU)

透過 ODU 恢復 drop 掉的表 (purge) 基本步驟如下

1:offline表所在表空間；

2:透過 logminer 挖出被 drop 表對應 object_id ；

3:使用 ODU 工具將表資料抽到檔案中；

4:使用 sqlldr 將資料載入到資料庫；

5:驗證；

一：主備測試資料

1 建立測試表 odu_test

create table odu_test (a number,b varchar2(10),c nvarchar2(30),d varchar2(20),e date,f timestamp,g binary_float,h binary_double);

2 插入測試資料

insert into odu_test

select rownum,

lpad('x', 10),

'NC測試 ' || rownum,

'ZHS測試 ' || rownum,

sysdate + dbms_random.value(0, 100),

systimestamp + dbms_random.value(0, 100),

rownum + dbms_random.value(0, 10000),

rownum + dbms_random.value(0, 10000)

from dba_objects

where rownum <= 10000;

commit;

3 備份並刪除表 odu_test ，模擬誤刪除

create table odu1 as select * from odu_test;

drop table odu_test purge;

二：恢復

1 offline表所在表空間

alter tablespace users offline;

2 使用 logminer 來查詢被 drop 表的object_id

select group#,status from v$log;

select member from v$logfile where group#=1;

SQL> exec sys.dbms_logmnr.start_logmnr(options=>sys.dbms_logmnr.dict_from_online_catalog);

SQL> select scn,timestamp,sql_redo from v$logmnr_contents where operation='DDL' and sql_redo like '%odu_test%' order by 2 ;

......

990001 2017/12/27 drop table odu_test purge;

SQL> select scn,timestamp,sql_redo from v$logmnr_contents where timestamp=to_date('2017-12-27','yyyy-mm-dd') order by 1;

SQL> create table logmnr_1 as (select * from v$logmnr_contents;

SQL> exec sys.dbms_logmnr.end_logmnr;

select *from sys.logmnr_1 where scn='990001'; ---DATA_OB# 87270

select * from sys.logmnr_1 where /*operation='DDL' and*/ LOWER(sql_redo) like '%odu_test%' order by 2 ;

/*

delete from "SYS"."OBJ$" where "OBJ#" = '87270' and "DATAOBJ#" = '87270' and "OWNER#" = '84' and "NAME" = 'ODU_TEST' and "NAMESPACE" = '1' and "SUBNAME" IS NULL and "TYPE#" = '2' and "CTIME" = TO_DATE('27-12 月 -17', 'DD-MON-RR') and "MTIME" = TO_DATE('27-12 月 -17', 'DD-MON-RR') and "STIME" = TO_DATE('27-12 月 -17', 'DD-MON-RR') and "STATUS" = '1' and "REMOTEOWNER" IS NULL and "LINKNAME" IS NULL and "FLAGS" = '0' and "OID$" IS NULL and "SPARE1" = '6' and "SPARE2" = '1' and "SPARE3" = '84' and "SPARE4" IS NULL and "SPARE5" IS NULL and "SPARE6" IS NULL and ROWID = 'AAAAASAABAAAVKkABB';

*/

3 修改原 control.txt 檔案

select d.TS# ts,

d.FILE# fno,

d.NAME filename,

d.BLOCK_SIZE block_size

from v$datafile d

order by ts;

0 1 1 D:\APP\ADMINISTRATOR\ORADATA\CJC\SYSTEM01.DBF 8192

1 2 2 D:\APP\ADMINISTRATOR\ORADATA\CJC\SYSAUX01.DBF 8192

2 3 3 D:\APP\ADMINISTRATOR\ORADATA\CJC\UNDOTBS01.DBF 8192

4 4 4 D:\APP\ADMINISTRATOR\ORADATA\CJC\USERS01.DBF 8192