如何仅在SQL Server中选择UNCOMMITTED行? [英] How to Select UNCOMMITTED rows only in SQL Server?

问题描述

我正在研究需要查询实时CRM系统的DW项目.标准隔离级别会对性能产生负面影响.我很想使用未提交的未锁定/事务隔离级别.我想知道有多少行是通过脏读识别的.

I am working on DW project where I need to query live CRM system. The standard isolation level negatively influences performance. I am tempted to use no lock/transaction isolation level read uncommitted. I want to know how many of selected rows are identified by dirty read.

推荐答案

也许您可以这样做:

SELECT * FROM T WITH (SNAPSHOT)
EXCEPT
SELECT * FROM T WITH (READCOMMITTED, READPAST)

但这是天生的不道德行为.

But this is inherently racy.

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