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oracle 回收站管理

Jun 07, 2016 pm 02:56 PM
oracle content recycle bin manage detailed

无详细内容 无 oracle10g,在pl/sql中选中删除后会出现类似:BIN$nJ5JuP9cQmqPaArFei384g==$0的表。1.查看回收站select * from user_recyclebin;2.清空回收站purge recyclebin;3.清空回收站中的某个表--如下方式删除会提示:SQL命令未正确结束。purge table B

oracle10g,在pl/sql中选中删除后会出现类似:BIN$nJ5JuP9cQmqPaArFei384g==$0的表。
1.查看回收站
select * from user_recyclebin;
2.清空回收站
purge recyclebin;
3.清空回收站中的某个表
--如下方式删除会提示:SQL命令未正确结束。
purge table BIN$/UpBuh+LQ9yZGN95BFsk5Q==$0
--正确写法如下:
purge table "BIN$/UpBuh+LQ9yZGN95BFsk5Q==$0";
--如下方式删除会提示:SQL命令未正确结束。
drop table BIN$/UpBuh+LQ9yZGN95BFsk5Q==$0
--而如下这样写,则会提示:无法对回收站中的对象执行DDL/DML。
drop table "BIN$0iJ7/rWFQrSGdZexvGv3qQ==$0"
4.恢复回收站
FLASHBACK TABLE "BIN$0iJ7/rWFQrSGdZexvGv3qQ==$0" TO BEFORE DROP
这是10g 的新特性
在10g中,如果启用flash drop功能,在drop表时,数据库不会直接删除,而是将其放在回收站中,当空间出现短缺时,才会逐渐回收这部分空间。
bin$表示表放在了回收站,你想要的话还可以找回来
删除的话一个方法是直接删delete tanle bin$.....;
另一种方法就是使用 purge table table_name;
drop table时, 不产生他们,修改你的drop语句

写成 :
DROP TABLE TABLE_NAME PURGE ;
转载:
以前只知道Windows有个回收站,今天听说Oracle也有个回收站!
在Oracle中可能不小心会DROP掉一个表,如果没有定期做备份的话,将会带来很大的麻烦。如果有的情况下,每天的数据都很重要,而定期备份的周期又稍长,情况恐怕也不容乐观!
不过还好Oracle有个回收站,概念就跟Windows里的回收站一模一样。
比如有以下误操作:
DROP TABLE drop_test;
这个时候再用SELECT语句查询此表时,将会提示表或视图不存在。但可以用如下语句查询到这个表还在Oracle回收站中:
SELECT * FROM user_recyclebin WHERE original_name=‘drop_test’;
那么现在就可以用如下语句进行恢复:
FLASHBACK TABLE drop_test TO BEFORE DROP
但是,要注意的是,如果用toad工具进行鼠标操作,即右键drop table时,如果选择了purge选项,那么就是永久性删除,在oracle的回收站也不会存在了,所以在进行表的删除的时候一般不要选择该选项,除非你很肯定该表不再使用。
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