利用Flashback轻松找回误删除数据
测试:
1.首先创建一张表TEST
create table test (name int)
2.插入两条数据:
insert into test values (1);
insert into test values (1);
3.对表启动移动行
ALTERTABLE table ENABLE ROW MOVEMENT; 4.删除表: drop table test 5.在回收站查询表: SHOWRECYCLEBIN; 或者 SELECTobject_name AS recycle_name,original_name,type FROMrecyclebin; 这个时候我们在回收站还是可以看到表test的,Flashback Drop就是从这里讲数据恢复的。 6.恢复数据: FLASHBACK table to test to before drop; 7.查询数据: select * from test 这时候就可以看到数据已经都还原了。非常好的功能,不需要像SQL Server那样从备份中还原。 Flashbackup drop有一些条件限制: Objects must meet the following prerequisites to be eligible for retrieval from the recycle bin: ■ The recycle bin is only available for non-system,locally managed tablespaces. If a table is in a non-system,locally managed tablespace,but one or more of its dependent segments (objects) is in a dictionary-managed tablespace,then these objects are protected by the recycle bin. ■ Tables that have Fine-Grained Auditing (FGA) and Virtual Private Database (VPD) policies defined over them are not protected by the recycle bin. ■ Partitioned index-organized tables are not protected by the recycle bin. ■ The table must not have been purged,either by a user or by Oracle Database because of a space reclamation operation. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |