FIX: CXPACKET and CXCONSUMER wait types show inconsistent results for some parallel query plans in SQL Server 2016 and 2017

Applies to: SQL Server 2017 DeveloperSQL Server 2017 EnterpriseSQL Server 2017 Enterprise Core

Symptoms


Assume that you use Microsoft SQL Server 2016 and 2017. When you query the dynamic management views (DMV's) sys.dm_exec_session_wait_stats and sys.dm_os_wait_stats, you may see inconsistent results for wait types CXPACKET and CXCONSUMER for some parallel query plans.

The same inconsistency can also be found between sys.dm_os_wait_stats and the wait stats in an Actual Execution Plan.

Resolution


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

       Cumulative Update 4 for SQL Server 2017

Service pack information for SQL Server 2016

This issue is fixed in the following service pack for SQL Server:

       Service Pack 2 for SQL Server 2016

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 terminology that Microsoft uses to describe software updates.