1 query, 3 parameters, 3 different plans

Parameter Sniffing in SQL Server 2019: Adaptive Joins

So far, I’ve talked about how adaptive memory grants both help and worsen parameter sniffing, and how the new air_quote_actual plans don’t accurately show what happened. But so far, I’ve been using a simple one-table query – let’s see what happens when I add a join and a supporting index: Transact-SQL CREATE INDEX IX_OwnerUserId_Includes ON…
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Do SQL Server 2017’s Adaptive Joins Work with Cross Apply or Exists?

I think I’ve mentioned that the most fun part of new features is testing them with old ideas to see how they react. It occurred to me that if Adaptive Joins didn’t work with APPLY, I might cry. So, here goes nothin’! Cross Simple Cross Apply…ies can use Adaptive Joins, though at first glance there’s…
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SQL Server 2017: Interleaved MSTVFs Vs Inline Table Valued Functions

But is it faster? Now, I know. There are very few “always” things out there in SQL Server. This is also true for functions. A lot of the time — I might even say most of the time, inline table valued functions are going to be faster that scalar and multi statement table valued functions.…
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The 2017 Adaptive Join Optimization Eats Bad TSQL For Breakfast

Cheeky If you thought that title sounded familiar, you sure were right. That’s called a classical reference. So here we are, three whole years later, and yet another improvement to the engine promises to fix performance issues forever and ever. While this isn’t exactly an entirely new cardinality estimator, it’s an entirely new branch in…
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