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The Problem with Automatic Plan Correction

Kendra Little lays it out:

I’ve written a bit about SQL Server’s Automatic Plan Correction feature before– I have an hour long free course with demos on Automatic Plan Correction here on the site.

Today I’m updating that course with a note: after using Automatic Plan Correction in anger for a good amount of time, I do not recommend enabling the feature. I’ve had it cause too many performance problems, and there are not a ton of options for an administrator when it’s causing those problems.

Kendra is still bullish about the potential of this but has some major issues with the current implementation. Read on to learn more about it.