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SQLServer误区30日谈第16天数据的损坏和修复 - 站长搜索
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SQLServer误区30日谈第16天数据的损坏和修复

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2022-09-23 17:00:10 转载来源: 网络整理/侵权必删

误区#16:多个关于数据的损坏和修复误区坊间流传的很多版本都不正确我已经听过很多关于数据修复可以做什么、不可以做什么、什么会导致数据损坏以及损坏是否可以自行消失。其实我已经针对这类问题写过多篇博文,因此本篇博文可以作为“流言终结者”来做一个总结,希望你能有收获

误区 #16:多个关于数据损坏修复误区

坊间流传的很多版本都不正确

我已经听过很多关于数据修复可以做什么、不可以做什么、什么会导致数据损坏以及损坏是否可以自行消失。其实我已经针对这类问题写过多篇博文,因此本篇博文可以作为“流言终结者”来做一个总结,希望你能有收获。 

 首先,对于数据修复可以做什么,不可以做什么,我已经写过一篇博文Misconceptions around database repair涵盖了13个误区—从不用DBCC CHECKDB是否能修复错误(当然不能)到REPAIR_ALLOW_DATA_LOSS是否会引起数据丢失(这个名字的确很让人迷惑)。

    其次,很多人抱怨说DBCC CHECKDB第一次运行时显示的错误在第二次运行时会自行消失。这很好解释:第一次由DBCC CHECKDB检测出的错误页已经不属于页分配集了,因此在第二次运行DBCC时就显示不出来了。我有一篇博文对此进行了详细的解释:Misconceptions around corruptions: can they disappear?。

    还有一个传的很广泛的流言是,运行时间长的操作(比如索引重建,大容量数据插入,数据库或文件的收缩)会导致页损坏。其实不然,除非SQL Server存在BUG的情况下(非常罕见)。没有任何T-SQL语句会导致数据出错。我几年前写过一篇文章对此进行了详细的解释:Search Engine Q&A #26: Myths around causing corruption。

    希望这篇文章对澄清这个概念有帮助

标签: SQLServer 误区 30日 16天 数据 损坏 修复


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