Grant Fritchey discusses Query Store’s automated cleanup and also looks at an interesting question:
Query Store has mechanisms for automatically cleaning your data. It is possible to cause them to break down. While presenting a session about the Query Store recently, I was asked what happened if you set the size of the Query Store below the amount of data currently in the store. I didn’t know the answer, so we tried it. Things got a little weird.
Click through to see how weird.