Estimation and Statistics : The Basis of query optimization
At the heart of SQL Server is the cost based optimizer. Stop and
think about that a minute, it attempts to give the “best plan” based on the
cost of the work undertaken.
How does it know the cost of the work before its done the work ? This isn’t a
conundrum, it doesn’t. It estimates! How does it estimate ? That is statistics.
This will be a deep dive into how the optimizer makes its decisions to give you
a plan, the things that can go wrong and how you can have influence over these
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Dave is a freelance SQLServer database developer / designer and has been working in the IT field for over 20 years, the past 15 of which has been specialising within SQLServer environment.
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