KB4540385 - FIX: DAX query causes server to have exceptions in TBB heap and crash in Windows heap in SQL Server 2016 and 2017


Assume that you run a Data Analysis Expressions (DAX) query in Microsoft SQL Server 2016 or 2017. If the SQL Server Analysis Services MemoryHeapType property is set to 6 or -1, you notice that an exception is generated after you wait for some time. If the server uses Windows heap, you also may notice that the same query crashes the service immediately.


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


This issue is fixed in the following cumulative updates 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:


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

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