Snapshot isolation: A threat for integrity? (Part 2)
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In the first part of this series, I showed how SQL Server 2005 prevents violation of foreign key constraints when using snapshot isolation by automatically and silently using a less concurrent isolation level. In this part, I’ll show how snapshot isolation can be used to really mess up your data. I’ll use the same sample tables I did in the first part, with one difference: only type A orders have to be for an existing customer; type B orders still need to have a customer ID included, but it doesn’t have to refer to an existing row in the…
