Buffer Pools And Availability Groups

Joey D’antoni answers the question, what happens to pages in the buffer pool when you have an AG failover?

Recently at SQL Saturday Philadelphia, we started discussing failover  as it relates to mirroring and Always On Availability Groups. Specifically, we were wondering what would happen if you had a relatively busy readable secondary replica (which would have a lot of pages in the buffer pool on the secondary instance) and if those pages would be flushed from cache or anything like that. So I reached out to the product group and Kevin Farlee from Microsoft was extremely helpful

The answer is not what I was expecting.

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