KB4057054 - FIX: CXPACKET and CXCONSUMER wait types show inconsistent results for some parallel query plans in SQL Server 2016 and 2017

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

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 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

Service packs are cumulative. Each new service pack contains all the fixes that are in previous service packs, together with any new fixes. Our recommendation is to apply the latest service pack and the latest cumulative update for that service pack. You do not have to install a previous service pack before you install the latest service pack. Use Table 1 in the following article for finding more information about the latest service pack and latest cumulative update.

How to determine the version, edition and update level of SQL Server and its components

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.

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