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2023-12-28
这篇文章给大家介绍Oracle Drop表如何进行purge恢复ODU,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
Oracle Drop表(purge)恢复(ODU)
通过ODU恢复drop掉的表(purge)基本步骤如下
1:offline表所在表空间;
2:通过logminer挖出被drop表对应object_id;
3:使用ODU工具将表数据抽到文件中;
4:使用sqlldr将数据加载到数据库;
5:验证;
一:主备测试数据
1 创建测试表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 插入测试数据
insert into odu_test
select rownum,
lpad(x, 10),
NC测试 || rownum,
ZHS测试 || 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 备份并删除表odu_test,模拟误删除
create table odu1 as select * from odu_test;
drop table odu_test purge;
二:恢复
1 offline表所在表空间
alter tablespace users offline;
2 使用logminer来查找被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 登录odu
5 扫描数据
---企业版ODU需要授权
---本次实验使用测试版ODU
6 恢复表
......
生成创建表的语句和控制文件
这个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表空间
alter tablespace users online;
8 通过sqlldr加载数据
9 验证数据
select count(*) from ODU_0000087270; ---10000
查看恢复后表数据
select * from ODU_0000087270;
......
查看备份表数据
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