FIX: SQL Server 2016 Database Mail causes high CPU usage after many email messages are sent

Applies to: SQL Server 2016 DeveloperSQL Server 2016 EnterpriseSQL Server 2016 Enterprise Core


After you send many email messages by using SQL Server 2016 Database Mail, your CPU usage is higher than expected.


This issue occurs because Database Mail creates an orphan System.Timers.Timer object in every loop iteration of the queue processor.


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

Cumulative Update 2 for SQL Server 2016 SP1

Cumulative Update 4 for SQL Server 2016


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.