In the Query Plan Pop Quiz, questions 2 and 3 asked you about what the sizes of arrows on query plans meant. The good news is that almost all of you got Question 2 right, but the bad news is that the vast majority of you got Question 3 completely incorrect, and the saddest part of that is that you’ve been using that inaccurate knowledge to guide your query tuning – and wasting your time.
Question 2: on an estimated plan, what does the thickness of the colored arrow represent?
If you hover your mouse over that arrow, the