Adaptive Joins

Erik Darling found a query which triggers an adaptive join in SQL Server 2017 CTP 2:

This probably won’t seem like a big deal soon

But I just got the optimizer to pick an Adaptive Join! It took a few tries to figure out what would cause some guesswork to happen, but here it is.

Erik promises more details are forthcoming as he works out the XML details.

Related Posts

Testing Inline Scalar UDF Performance

Erik Darling whips up a performance test covering scalar UDF changes in SQL Server 2019: This is a slightly different take on yesterday’s post, which is also a common problem I see in queries today. Someone wrote a function to figure out if a user is trusted, or has the right permissions, and sticks it […]

Read More

Making Non-SARGable Queries SARGable with an Index

Denis Gobo violates Betteridge’s Law of Headlines: This question came up the other day from a co-worker, he said he couldn’t change a query but was there a way of making the same query produce a better plan by doing something else perhaps (magic?) He said his query had a WHERE clause that looked like […]

Read More

Categories