回滚已提交的事务 [英] Rollback a committed transaction

问题描述

有什么方法可以在oracle 11g

我已经在db中创建了delete from table并提交了它，现在我想rollback提交更改.有什么办法吗?

I have made a delete from table in db and committed it, now I want to rollback the committed change. Is there any way to do it?

推荐答案

您无法回滚已提交的内容.在这种特殊情况下，作为最快的选项之一，您可以执行的操作是对已从中删除行并将其插入的表进行闪回查询.这是一个简单的示例:

You cannot rollback what has already been commited. What you can do, in this particular situation, as one of the quickest options, is to issue a flashback query against a table you've deleted row(s) from and insert them back. Here is a simple example:

注意:此操作的成功取决于undo_retention参数的值(默认为900秒)-一段时间(可以自动减少)，在此期间将撤消信息保留在撤消表空间中.

Note: Success of this operation depends on the value(default 900 seconds) of undo_retention parameter - period of time(can be reduced automatically) during which undo information is retained in undo tablespace.

/* our test table */
create table test_tb(
   col number
);
/* populate test table with some sample data */
insert into test_tb(col)
   select level
     from dual
  connect by level <= 2;

select * from test_tb;

COL
----------
         1
         2
/* delete everything from the test table */    
delete from test_tb;

select * from test_tb;

no rows selected

向后插入已删除的行:

/* flashback query to see contents of the test table 
  as of specific point in time in the past */ 
select *                                   /* specify past time */
  from test_tb as of timestamp timestamp '2013-11-08 10:54:00'

COL
----------
         1
         2
/* insert deleted rows */
insert into test_tb
   select *                                 /* specify past time */  
    from test_tb as of timestamp timestamp '2013-11-08 10:54:00'
   minus
   select *
     from test_tb


 select *
   from test_tb;

  COL
  ----------
          1
          2

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