Paste The Plan

Brent Ozar introduces a new website:

It’s a free community service. We hope you love it as much as we do, especially all the cool new execution plan icons by our illustrator, Eric Larsen.

Down the road, we’re thinking about adding logins (so you can see past plans you’ve submitted), execution plan advice, image and HTML downloads (so you can embed the plan in your own blog or report), zooming, and more.

Check out the Paste The Plan website.

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Forced Parameterization and Filtered Indexes

Aaron Bertrand walks us through a case where filtered indexes become unhelpful: Again, focusing on the areas highlighted in orange: the statement has a parameter @0 (previously it had @1) but, more importantly, the clustered index is scanned now instead of the filtered index. This has impacts throughout the plan, including how many rows are […]

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COUNT(*) Versus COUNT(1)

Lukas Eder takes on the myth that COUNT(*) differs from COUNT(1): Now that we know the theory behind these COUNT expressions, what’s the difference between COUNT(*) and COUNT(1). There is none, effectively. The 1 expression in COUNT(1) evaluates a constant expression for each row in the group, and it can be proven that this constant expression will never evaluate to NULL, so effectively, we’re running COUNT(*), […]

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