KB4340759 - FIX: Slow performance of SQL Server 2016 when Query Store is enabled

Symptoms

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.

Resolution

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

       Cumulative Update 2 for SQL Server 2016 SP2

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

Latest cumulative update for SQL Server 2016

Workaround

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

Status

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

References

Learn about the terminologythat Microsoft uses to describe software updates.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

Thank you for your feedback!

Thank you for your feedback! It sounds like it might be helpful to connect you to one of our Office support agents.

×