闪回数据

/*1.FLASHBACK QUERY*/
--闪回到15分钟前
select *  from orders  as of timestamp (systimestamp - interval ''15'' minute)  where ......
这里可以使用DAY、SECOND、MONTH替换minute,例如:
SELECT * FROM orders AS OF TIMESTAMP(SYSTIMESTAMP - INTERVAL ''2'' DAY)

--闪回到某个时间点
select  *  from orders  as of timestamp  to_timestamp (''01-Sep-04 16:18:57.845993'', ''DD-Mon-RR HH24:MI:SS.FF'') where ...

--闪回到两天前
select * from orders  as of timestamp (sysdate - 2) where.........

 

/*2.FLASHBACK DROP*/
1.flashback table orders to before drop;
2.如果源表已经重建,可以使用rename to子句:
flashback table order to before drop  rename to order_old_version;

 

/*3.FLASHBACK TABLE*/
1.首先要启用行迁移:
alter table order enable row movement;
2.闪回表到15分钟前:
flashback table order  to timestamp systimestamp - interval ''15'' minute;
闪回到某个时间点:
FLASHBACK TABLE order TO TIMESTAMP    TO_TIMESTAMP('2007-09-12 01:15:25 PM','YYYY-MM-DD HH:MI:SS AM')

posted @ 2015-01-28 09:40  CoderLeob  阅读(171)  评论(0)    收藏  举报