FIX: Transactions and log truncation may be blocked when you use Query Store in SQL Server 2016 and 2017

Applies to: SQL Server 2017 Developer on WindowsSQL Server 2017 Enterprise on WindowsSQL Server 2017 Enterprise Core on Windows


Assume that you enable Query Store in SQL Server 2016 and 2017. When you run the command ALTER DATABASE <DatabaseName> SET QUERY_STORE CLEAR on a very busy database, you may notice that the transactions and log truncation will be blocked by a Query Store background thread.


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

       Cumulative Update 11 for SQL Server 2017

       Cumulative Update 5 for SQL Server 2016 Service Pack 2


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


Learn about the terminology that Microsoft uses to describe software updates.