FIX: DAX query performance decrease after you upgrade to SQL Server 2017

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

Symptoms


You upgrade to SQL Server 2017. When you run any of your existing Data Analysis Expressions (DAX) queries in SQL Server 2017, you may notice a significant decrease in performance. The decrease in performance scales with the size of the DAX query after all the measures have been replaced with their corresponding expressions.

Resolution


This fix is included in the following update for SQL Server:

Cumulative Update 8 for SQL Server 2017

Note This fix limits costly analysis only to queries that contain virtual objects such as query scope columns.

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 standard terminology that Microsoft uses to describe software updates.