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這篇文章給大家介紹 Oracle Drop 表如何進行 purge 恢復 ODU,內容非常詳細,感興趣的小伙伴們可以參考借鑒,希望對大家能有所幫助。
Oracle Drop 表 (purge) 恢復(ODU)
通過 ODU 恢復 drop 掉的表 (purge) 基本步驟如下
1:offline 表所在表空間;
2: 通過 logminer 挖出被 drop 表對應 object_id;
3: 使用 ODU 工具將表數據抽到文件中;
4: 使用 sqlldr 將數據加載到數據庫;
5: 驗證;
一:主備測試數據
1 創建測試表 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 插入測試數據
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 備份并刪除表 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 來查找被 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 文件
select d.TS# ts,
d.FILE# fno,
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
—control.txt
4 登錄 odu
5 掃描數據
— 企業版 ODU 需要授權
— 本次實驗使用測試版 ODU
6 恢復表
……
生成創建表的語句和控制文件
這個命令生成了如下文件
ODU_0000087270.ctl 和 ODU_0000087270.sql
CREATE TABLE ODU_0000087270
(
C0001 NUMBER ,
C0002 VARCHAR2(4000) ,
C0003 NVARCHAR2(2000) ,
C0004 VARCHAR2(4000) ,
C0005 DATE ,
C0006 DATE ,
C0007 BINARY_FLOAT ,
C0008 BINARY_DOUBLE
);
7 online 表空間
alter tablespace users online;
8 通過 sqlldr 加載數據
9 驗證數據
select count(*) from ODU_0000087270; —10000
查看恢復后表數據
select * from ODU_0000087270;
……
查看備份表數據
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