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Fake statistics, and how to get rid of them

There are two ways to test how your queries behave on huge amounts of data. The simple option is to actually use them on huge amounts of data – but where do you get that if you have no access to the production database, and how do you store it if you happen not to have a multi-terabyte storage array sitting in your basement? So here’s the second best option: you cheat. Luckily, SQL Server has a feature that allows you to do just that. I must warn you that this feature is undocumented and unsupported. You should never under…
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