本文主要是介绍flashback table实验（基于undo数据），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
开启闪回：http://blog.csdn.net/rlhua/article/details/11934831
1、查询原数据
sys@TEST0910> select count(*) from test10;
COUNT(*)
----------
14
1 row selected.
2、查询数据库当前scn号，稍后作为恢复参考
sys@TEST0910> select checkpoint_change# from v$database;
CHECKPOINT_CHANGE#
------------------
1952615
1 row selected.
3、误操作
sys@TEST0910> delete from scott.test10;
14 rows deleted.
sys@TEST0910> commit;
Commit complete.
4、根据之前的scn号使用undo数据闪回查询
sys@TEST0910> select * from scott.test10 as of scn 1952615;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
14 rows selected.
5、将数据还原
可以插入回去，如闪回查询那样： insert into test10 select * from scott.test10 as of scn 1952615;
另外一种，可以用闪回表的方式： flashback table scott.test10 to scn 1952615;
注意，闪回表时要开启 row movement，不然要报错。
sys@TEST0910> flashback table scott.test10 to scn 1952615;
flashback table scott.test10 to scn 1952615
*
ERROR at line 1:
ORA-08189: cannot flashback the table because row movement is not enabled
sys@TEST0910> alter table scott.test10 enable row movement;
Table altered.
sys@TEST0910> flashback table scott.test10 to scn 1952615;
Flashback complete.
sys@TEST0910> select count(*) from scott.test10;
COUNT(*)
----------
14
1 row selected.
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