SQL Server是否具有任何类型的魔法撤消功能？

Question

长话短说,我试图使用Management studio快速更新SQL Server中的单行,只是键入UPDATE table SET column='value'并忘记了该WHERE other_column='other_value'部分.去吃午饭,回来了,还有15封未读的电子邮件等着我.发生在大约一个小时前,等待数据库人回来查看上次备份的时间.虽然有没有神奇的UNDO功能？

Answer 1

是的,有 - 这是交易日志.要从这样的事情中恢复,只要您的数据库处于完全恢复模型,您只需执行另一个事务日志备份,然后使用设置的STOPAT选项进行恢复,以告知恢复在此时停止恢复.在您开始交易之前的时间.这将使数据库恢复到您的错误点.

有关使用STOPAT选项的更多信息,请参见此处 - http://msdn.microsoft.com/en-us/library/ms186858(SQL.90).aspx.

你的脚本看起来像这样......

-- backup the existing log
BACKUP LOG [MyDatabase]
     TO DISK = N'\\MyServer\Share\MyDatabase.trn'
     -- options left out for brevity
GO

-- restore the database first
RESTORE DATABASE [MyDatabase] 
    FROM  DISK = N'\\MyServer\Share\MyDatabase.bak' 
    WITH  FILE = 1,  
    NORECOVERY,  
    NOUNLOAD,  
    STATS = 10
GO

/* Previous transaction logs in the chain go here... */

/* restore your log that you backed up after the mistake 
   took place, stopping at your point where the problem happened */
RESTORE LOG [MyDatabase] 
    FROM  DISK = N'\\MyServer\Share\MyDatabase.trn' 
    WITH  FILE = 1,  
    NORECOVERY,  
    NOUNLOAD,  
    STATS = 10,
    STOPAT = '2010-03-12 13:00'
GO