flashback off下delete和update表的恢复(flashback query技术)
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SQL> create table emp (id number,name varchar2(100),salary number);
Table created.
SQL> insert into emp values(1,'zhang',100);
1 row created.
SQL> insert into emp values(2,'jiao',100);
1 row created.
SQL> commit;
Commit complete.
(select salary from emp
as of timestamp
to_timestamp('2012-04-15 16:04:12','yyyy-mm-dd hh24:mi:ss') e2
where e1.id=e2.id )
Table created.
SQL> insert into emp values(1,'zhang',100);
1 row created.
SQL> insert into emp values(2,'jiao',100);
1 row created.
SQL> commit;
Commit complete.
SQL> alter session set nls_date_format='hh24:mi:ss';
SQL> select sysdate from dual;
SYSDATE
--------
16:04:12
SQL> delete from emp;
2 rows deleted.
SQL> commit;
Commit complete.
SQL> select * from emp;
no rows selected
SQL> select * from emp
2 as of timestamp
3 to_timestamp('2012-04-15 16:04:12','yyyy-mm-dd hh24:mi:ss');
SQL> insert into emp
2 select * from emp
3 as of timestamp
4 to_timestamp('2012-04-15 16:04:12','yyyy-mm-dd hh24:mi:ss');
2 rows created.
SQL> commit;
------------------------------------------------------------------------------------------------
update回之前指定列的恢复
update emp e1 set e1.salary=(select salary from emp
as of timestamp
to_timestamp('2012-04-15 16:04:12','yyyy-mm-dd hh24:mi:ss') e2
where e1.id=e2.id )
commit;
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