SQL SERVER – Enabling Older Legacy Cardinality Estimation

Yesterday, I had a very interesting situation, one of our Comprehensive Database Performance Health Check client immediately called me on Skype with his entire server going continuously stopping due to a very toxic poison wait type of Resource Semaphore. Though, we had a good idea how to fix the wait type the real issue was the server was not staying up long enough to put us a patch in the system. It was extremely frustrating for us and finally, we were able to deploy the patch Enabling Older Legacy Cardinality Estimation.

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