Highlight Expensive Queries

Ed Elliott has another tool in his SSDT DevPack:

When you enable the query cost for a document (I map it to the keys ctrl+k, ctrl+q) what the tool does is connect to a SQL Server instance and run the stored procedure using “SET SHOWPLAN_XML ON” so it isn’t actually executed but the estimated query plan is returned and the cost of each statement checked to see how high it is.

By default high statements must have a cost over 1.0 to be marked as high and anything over 0.2 is marked as a warning – you can override these with this in your “%UsersProfile%\SSDTDevPack\config.xml” :

You can quibble with the cost values but this is a really cool feature.

Related Posts

Hiding Work: The Nested Loop Operator

Erik Darling explains that the nested loop operator is like a duck: there’s more going on beneath the surface than it lets on: I’m going to talk about my favorite example, because it can cause a lot of confusion, and can hide a lot of the work it’s doing behind what appears to be a […]

Read More

Stored Procedure IF Branching and Performance

Erik Darling explains that the IF block in a stored procedure won’t help you with performance: Making plan choices with IF branches like this plain doesn’t work.The optimizer compiles a plan for both branches based on the initial compile value.What you end up with is a stored proc that doesn’t do what it’s supposed to […]

Read More

Categories

November 2015
MTWTFSS
« Jan Dec »
 1
2345678
9101112131415
16171819202122
23242526272829
30