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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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