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闪回技术之闪回表

原创 Oracle 作者:Rman2017 时间:2017-04-19 09:23:09 0 删除 编辑

SQL> conn test/test;

Connected.


SQL> select * from mytest2;


NAME                 EMAIL

-------------------- ------------------------------

mingming             lsm_3036@163.com

weiwei               liangliang@163.com


SQL> alter table mytest2 enable row movement;

Table altered.


SQL> select dbms_flashback.get_system_change_number from dual;


GET_SYSTEM_CHANGE_NUMBER

------------------------

                 1404479



SQL> insert into mytest2 values('xinxin','xinxin@163.com');


1 row created.


SQL> commit;

Commit complete.


SQL> select * from mytest2;


NAME                 EMAIL

-------------------- ------------------------------

mingming             lsm_3036@163.com

weiwei               liangliang@163.com

xinxin               xinxin@163.com


SQL> select dbms_flashback.get_system_change_number from dual;


GET_SYSTEM_CHANGE_NUMBER

------------------------

                 1404525


SQL> delete from mytest2;


3 rows deleted.


SQL> commit;

Commit complete.



SQL> flashback table mytest2 to scn 1404479;

Flashback complete.


SQL> select * from mytest2;


NAME                 EMAIL

-------------------- ------------------------------

mingming             lsm_3036@163.com

weiwei               liangliang@163.com


SQL> delete from mytest2;


2 rows deleted.


SQL> commit;

Commit complete.


SQL> flashback table mytest2 to scn 1404525;


Flashback complete.


SQL> select * from mytest2;


NAME                 EMAIL

-------------------- ------------------------------

mingming             lsm_3036@163.com

weiwei               liangliang@163.com

xinxin               xinxin@163.com



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