When you run a Data Analysis Expressions (DAX) query in SQL Server 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 update 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: