When you run a Data Analysis Expressions (DAX) query in Microsoft SQL Server 2016 or 2017 multidimensional model database, you may notice that the DAX query requires more than 200 times of memory than the size of the database.
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: