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這篇文章給大家介紹Oracle Drop表如何進(jìn)行purge恢復(fù)ODU,內(nèi)容非常詳細(xì),感興趣的小伙伴們可以參考借鑒,希望對(duì)大家能有所幫助。
Oracle Drop表(purge)恢復(fù)(ODU)
通過ODU恢復(fù)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(duì)應(yīng)object_id;
3:使用ODU工具將表數(shù)據(jù)抽到文件中;
4:使用sqlldr將數(shù)據(jù)加載到數(shù)據(jù)庫(kù);
5:驗(yàn)證;
一:主備測(cè)試數(shù)據(jù)
1 創(chuàng)建測(cè)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(cè)試數(shù)據(jù)
insert into odu_test
select rownum,
lpad('x', 10),
'NC測(cè)試' || rownum,
'ZHS測(cè)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(fù)
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(shù)據(jù)
---企業(yè)版ODU需要授權(quán)
---本次實(shí)驗(yàn)使用測(cè)試版ODU
6 恢復(fù)表
......
生成創(chuàng)建表的語(yǔ)句和控制文件
這個(gè)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(shù)據(jù)
9 驗(yàn)證數(shù)據(jù)
select count(*) from ODU_0000087270; ---10000
查看恢復(fù)后表數(shù)據(jù)
select * from ODU_0000087270;
......
查看備份表數(shù)據(jù)
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