KB4570571 - FIX: Query slowness may occur when CPU-intensive SQL Server system tasks run in SQL Server 2019

Applies to: SQL Server 2019 on Windows

Symptoms


When using Availability Groups with SQL Server 2019, you notice that some query slowness may occur on one or more replicas when there are CPU-intensiveSQL Server system tasks running.

Status


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

Resolution


This improvement is included in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
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:

References


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