标签:io 使用 for on 数据 ef amp as 时间
/*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‘)
标签:io 使用 for on 数据 ef amp as 时间
原文地址:http://my.oschina.net/sunnywu/blog/357950