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记一次SQLServer数据库误删数据找回

Jun 07, 2016 pm 03:40 PM
sqlserver retrieve data database yesterday Mistakenly deleted

昨天 同事在本机清理数据库表时,连接到了生产机,误删了二十几张表,幸好是晚上加班的时候删除的,生产机上当时是一天一备份,还原备份是最后的策略,最关键的还是要找回数据。 生产机环境是server2008 R2、 sqlserver2012,使用delete语句删除的表现在开始

        昨天 同事在本机清理数据库表时,连接到了生产机,误删了二十几张表,幸好是晚上加班的时候删除的,生产机上当时是一天一备份,还原备份是最后的策略,最关键的还是要找回数据。

        生产机环境是server2008 R2、 sqlserver2012,使用delete语句删除的表现在开始还原,还原可参考dudu的这篇文章(链接),其中使用Recovery for SQL Server工具还原,发现还原的数据字段值为demo,所以最后还是用sql命令去还原的,用sql命令,微软官方给的比较明细(链接)。

一、还原需要的条件设置

        使用命令,是通过sqlserver的事务日志以及一个误删除前的数据库的完整备份进行还原,所以在sqlserver2012的维护计划向导中,要建立完整备份,差异备份和事务日志,具体如下记一次SQLServer数据库误删数据找回

以及在数据库属性,选项设置中,设置为完整备份,具体如下图

记一次SQLServer数据库误删数据找回

做好如上两个设置,数据库误删后找回数据就会非常轻松,现在说一下如何还原sqlserver数据到故障点。

二、还原命令

还原主要分为四步走:

1、出现故障后,首先执行备份事务日志命令,这里以AdventureWorks作为数据库名。命令如下:

BACKUP LOG AdventureWorks TO DISK = 'C:\SQLServerBackups\AdventureWorks_transcationlog.bak'  
   WITH NORECOVERY; 
Copy after login

2、从完整备份还原数据

RESTORE  DATABASE [QASupervision] FROM DISK=<span>'M:\Database\OA\AdventureWorks_Fullbackup_2014_03_18_010002_0155764.bak'</span> 
WITH  NORECOVERY, REPLACE 
Copy after login

3、从差异备份还原数据

RESTORE DATABASE [QASupervision] FROM DISK=<span>'M:\Database\OA\AdventureWorks_diffbackup_2014_03_18_020002_0155764.bak'</span> WITH NORECOVERY, REPLACE 
Copy after login

4、从事务日志还原数据,还原到某个时间点之前

DECLARE @dt datetime   
SELECT @dt=DATEADD(HOUR,-16,GETDATE())   
select @dt
RESTORE LOG [QASupervision] FROM DISK='C:\SQLServerBackups\AdventureWorks_transcationlog.bak'  WITH  STOPAT=@dt,RECOVERY
Copy after login

5、还原数据库,如果数据库提示正在还原中,则执行此命令即可。

RESTORE DATABASE AdventureWorks WITH RECOVERY
Copy after login
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