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Resolver I
Resolver I

SUMX Too Slow - Solution is SUMMARIZE

Hi Community,


I need some assistance in undertanding why my SUMX is so slow performing and why the solution to my problem is SUMMARIZE.


To give you an overview of the solution i am working on:


I want to be able to view the


  • Sales £
  • Discount £,
  • Discount % = Discount £ / Sales £
  • Target % = AVERAGE(Taget %)
  • vs Target % = (Discount % - Target %) / Target %
  • Pottential Savings = sumx(RETAIL_SALES,(RETAIL_SALES[Discount %] - Disc_Target[Target %]) * RETAIL_SALES[Ticket Price])


The model is the below:


Disc Model.JPG


So what is the issue i am experiencing?


The measure:


Pottential Savings = sumx(RETAIL_SALES,(RETAIL_SALES[Discount %] - Disc_Target[Target %]) * RETAIL_SALES[Ticket Price])


is returning the following error:


Disc error.JPG


When publishing my solution to the Power BI Service. 


I done much reading into this and understood that SUMX steos through the data one row at a time and is less efficient. What exactly does this mean with the above DAX Formula i put together, can anyone please explain this in their own words?


My understanding is this: the SUMX is trying to caclulate the formula at the lowest granularity for the specified Table which is 'Retail_Sales', hence it returns the max memory consumption error. If i am wrong please do let me know.


What solution have i found?


Part 1 is the below DAX Formula:


Manual Disc % - Target % = 

    ([Discount %]-Disc_Target[Target %]),
		        STORES[Store Group],STORES[Store Name] 

Part 2 is the below Dax Formula:


Ticket Price = 

		        STORES[Store Group],STORES[Store Name] 


Part 3 is the below DAX Formula which consists of the above:


Pottential Savings V2 = 
        [Manual Disc % - Target %]*[Ticket Price]

After spending multiple hours on the above, can  someone please tell me why: the above 'Pottential Savings V2' is working brilliantly, whilst the SUMX equivalent is not performing at all.







Community Support
Community Support

Hi @Laz ,


How did you create your visual? Kindly share your pbix to me. Please upload your files to One Drive and share the link here.




Community Support Team _ Frank
If this post helps, then please consider Accept it as the solution to help the others find it more quickly.

Hi @v-frfei-msft ,


All my data is sesnisitve. hence quite hesitant to share it. I know this makes it harder for anyone to help me out when i share a post like this.


In regards to how did i create the visual. If understood correctly, all i am using is a Matrix visual which i include the measure 'Pottential Savings' as a value. This measure includes the SUMX.


I am making the assumption that the SUMX measure is displaying this error message, as it goes to the lowest level detail and conducts the calculation row by row. Whilst, when i am using the alternative which is working, with the SUMMARIZE, i stay at a much higher level hence returns the needed result.





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