FIX: Slow performance of SQL Server 2016 when Query Store is enabled

Applies to: SQL Server 2016 DeveloperSQL Server 2016 Enterprise CoreSQL Server 2016 Enterprise


Assume that you have a database that has Query Store enabled in Microsoft SQL Server 2016. When the database is under heavy workloads, spinlock contention may occur and server performance may become slow. In particular, you may see heavy contention on the QUERY_STORE_ASYNC_PERSIST spinlock or SPL_QUERY_STORE_STATS_COOKIE_CACHE spinlock.


This issue is fixed in the following cumulative update for SQL Server:

       Cumulative Update 2 for SQL Server 2016 SP2


To work around this issue, switch Query Store to read-only mode or disable Query Store on the database.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


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