Oracle10g对于闪回查询进行了增强，支持更简单的SQL操作，允许对误删除、误更新等DML操作进行闪回。
看一下以下测试:
1.原表记录



$ sqlplus sys/sys@10.163.139.68 as sysdba

SQL*Plus: Release 10.1.0.2.0 - Production on Wed Mar 30 08:52:04 2005

Copyright (c) 1982, 2004, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options

SQL> select dbms_flashback.get_system_change_number from dual;

GET_SYSTEM_CHANGE_NUMBER
------------------------
                  804052

2.误修改后所有记录
并且提交更改。

select * from crm3.tsub_info as of scn 804052;

<显示数据>

我们看到在SCN=10670000时，数据都在。
3.恢复数据.

select * from crm3.tsub_info as of scn 800000;

sql> update crm3.tsub_info t1 set t1.taskid = (select t2.taskid from crm3.tsub_info as of scn 800000)
where exists (
      (
      select 'X' from crm3.tsub_info as of scn 800000
      ) t2 where t1.taskid =  t2.taskid
)

SQL >commit;

Commit complete.

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使用Oracle10g的Flashback Query进行数据闪回

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