There are obvious advantages as well as challenges to schemabinding things, and whether you do or don’t is often a matter of preference. However, in some cases, you need schemabinding; when you’re designing indexed views, and to optimize user-defined functions. Here’s why:
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About the spool operator
The spool operator is one of those icons that will show up in a query plan now and then. In this post, we’ll take a closer look at what it does in a query plan, how it affects performance, and what you can do to substitute or eliminate it.