何谓SQLSERVER参数嗅探
何谓SQLSERVER参数嗅探 大家听到嗅探这个词应该会觉得跟黑客肯定有关系吧,使用工具嗅探一下参数,然后截获,脱裤o(_)o 。 事实上,我觉得大家太敏感了,其实这篇文章跟数据库安全没有什么关系,实际上跟数据库性能调优有关 相信大家有泡SQLSERVER论坛的话不
何谓SQLSERVER参数嗅探
大家听到“嗅探”这个词应该会觉得跟黑客肯定有关系吧,使用工具嗅探一下参数,美国空间,然后截获,脱裤o(∩_∩)o 。
事实上,我觉得大家太敏感了,香港服务器,其实这篇文章跟数据库安全没有什么关系,香港空间,实际上跟数据库性能调优有关
相信大家有泡SQLSERVER论坛的话不多不少应该都会见过“参数嗅探”这几个字
这里有三篇帖子都是讲述参数嗅探的
下面我给出一个测试数据库的备份文件,里面有一些表和一些测试数据 ,大家可以去下载,因为我下面用的测试表都是这个数据库里的
只需要还原数据库就可以了,这个数据库是SQL2005版本的,数据库名:AdventureWorks
下面只需要用到三张表,表里面有索引:
[Production].[Product]
[SalesOrderHeader_test]
[SalesOrderDetail_test]
数据库下载链接:AdventureWorks_Full_backup_2013-3-4.bak
其实简单来讲,参数嗅探我的很通俗的解释就是:SQLSERVER用鼻子嗅不到具体参数是多少
所以他不能选择最合适的执行计划去执行你的查询,所以参数嗅探是一个不好的现象。
想真正了解参数嗅探,大家可以先创建下面两个存储过程
存储过程一:
Sniff Sniff(@i INT) (b.),) . a . b b.. p p.a.

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