1. 表查詢(xún)閃回create table xcp as (select * from b_za_bzdzkxx);
select * from xcp;
select count(1) from xcp;--22001
select count(1) from xcp t where t.dzbh like '510521%';--7011
delete from xcp t where t.dzbh like '510521%';
select count(1) from xcp;--14990
--查找指定時(shí)間點(diǎn)前的數據
select count(1) from xcp as of timestamp to_timestamp('2011-12-23 10:49:30','yyyy-MM-dd hh24:mi:ss');--22001
select * from xcp for update;--添加一條記錄
select count(1) from xcp;--14991
--恢復指定時(shí)間點(diǎn)的前delete數據(將刪除恢復時(shí)間點(diǎn)后面的數據)
alter table xcp enable row movement;--啟動(dòng)的行移動(dòng)功能flashback table xcp to timestamp to_timestamp('2011-12-23 10:49:30,'yyyy-MM-dd hh24:mi:ss');select count(1) from xcp;--22001
--恢復指定時(shí)間點(diǎn)的前delete數據,并保留恢復時(shí)間點(diǎn)后面的數據create table xcp2 as (select * from xcp t where t.createdtime>to_timestamp('2011-12-23 10:49:30','yyyy-MM-dd hh24:mi:ss'));
select * from xcp2;--臨時(shí)表
alter table xcp enable row movement;--啟動(dòng)的行移動(dòng)功能flashback table xcp to timestamp to_timestamp('2011-12-23 10:49:30,'yyyy-MM-dd hh24:mi:ss');select count(1) from xcp;--22001
insert into xcp select * from xcp2 --將臨時(shí)表的數據再插入到源表select count(1) from xcp;--22002
2.刪除閃回[10g+]
刪除閃回為刪除oracle 10G提供了一個(gè)數據庫安全機制,當用戶(hù)刪除一個(gè)表時(shí),oracle 10G會(huì )將該表放到回收站中,回收站中的對象一直會(huì )保留,直到用戶(hù)決定永久刪除它們或出現表空間的空間不足時(shí)才會(huì )被刪除?;厥照臼且粋€(gè)虛擬容器,用于存儲所有被刪除的對象。數據字典user_tables中的列dropped表示被刪除的表,查詢(xún)方法如下:
select table_name,dropped from user_tables;--設置數據庫是否啟用回收站
alert session set recyclebin = off;--查詢(xún)回收站對象
select * from recyclebin;
select * from user_recyclebin;
select * from dba_recyclebin;
drop table xcp;
select count(1) from xcp;--0
--恢復drop的表
flashback table xcp to before drop;select count(1) from xcp;--22001
如果不知道原表名,可以直接使用回收站中的名稱(chēng)進(jìn)行閃回..
flashback table "BIN$JiXyAUO4R+u3qNVfQK/Kiw==$0" to before drop;
在回收的同時(shí)可以修改表名
flashback table " BIN$JiXyAUO4R+u3qNVfQK/Kiw==$0" to before drop rename to xcp1;
--真正刪除一個(gè)表,而不進(jìn)入回收站,可以在刪除表時(shí)增加purge選項
drop table xcp1 purge;--也可以從回收站永久性刪除表
purge table xcp1;--刪除當前用戶(hù)回收站
purge recyclebin--刪除全體用戶(hù)在回收站的資源
purge dba_resyclebin
3.數據庫閃口 [10g+] 使用數據庫閃回功能,可以使數據庫回到過(guò)去某一狀態(tài),語(yǔ)法如下:
sql:
alter database flashback on; sql:
flashback database to scn 46963; sql:
flashback database to timestamp to_timestamp('2007-2-12 12:00:00','yyyy-MM-dd hh24:mi:ss');