topic Re: How to Improve Performance of Running Total DAX Calculation in DAX Commands and Tips

How to Improve Performance of Running Total DAX Calculation

MyKr — Sun, 19 Feb 2023 14:21:24 GMT

Hi PBI Community,

I am building a dashboard where Running Total (based on percentage of emission) need to be shown. This visual would be effected by various filters such as region, country and others.
Following is the measure that works, however the computing time is in excess of 1 minute and unable to compute if the dashboard is published (Visual has exceeded the available resources).

Attached is the sample pbix File. (Data has 59k rows) RunningTotal Power BI File

Carbon RT % = VAR CarbonRT = CALCULATE([Carbon Sum],FILTER(ALLSELECTED(Emission[Building Name]),SUM(Emission[Carbon])<=[Carbon Sum])) VAR CarbonTotal = CALCULATE(SUM(Emission[Carbon]),ALLSELECTED(Emission[Building Name])) VAR CarbonPercentage = DIVIDE(CarbonRT,CarbonTotal) Return CarbonPercentage

Is there any way I can optimise the measure to run faster or other alternative approach?

Of course limiting the table visual does help in performance, however the requirement is to display the overall table.

Appreciate your input.

Re: How to Improve Performance of Running Total DAX Calculation

Jihwan_Kim — Sun, 19 Feb 2023 16:05:00 GMT

Hi,

Please try something like below.

I don't think it improved extremely, but it did improve a little.

Please check if it suits your requirement.

Running total % = VAR _carbontotal = CALCULATE ( [Carbon Sum], ALLSELECTED ( Emission[Building Name] ) ) VAR _newtable = ADDCOLUMNS ( ALLSELECTED ( Emission[Building Name] ), "@carbonsum", [Carbon Sum] ) VAR _cumulatetable = ADDCOLUMNS ( _newtable, "@cumulatesum", SUMX ( FILTER ( _newtable, [@carbonsum] >= EARLIER ( [@carbonsum] ) ), [@carbonsum] ), "@total", _carbontotal ) RETURN MAXX ( FILTER ( ADDCOLUMNS ( _cumulatetable, "@result", DIVIDE ( [@cumulatesum], [@total] ) ), Emission[Building Name] = MAX ( Emission[Building Name] ) ), [@result] )

Re: How to Improve Performance of Running Total DAX Calculation

ppm1 — Mon, 20 Feb 2023 02:53:36 GMT

Nice improvement, Jihwan_Kim . I wrote almost the same measure before I saw your response. MyKr note that while improving the DAX is great, the real issue on performance is that you have a visual that has >11K rows. If you are creating a visual for people to export data, that's one thing. Otherwise, you may want to consider a report design that limits the # of rows in the table at any given time.

Pat

Re: How to Improve Performance of Running Total DAX Calculation

MyKr — Mon, 20 Feb 2023 13:39:06 GMT

Hi Jihwan_Kim , brilliant, your solutions works well and significantly reduced the calculation time! thank you.

ppm1 thanks for the support. Yes, it is alot of data! but unfortunately that is the requirement to facilitate discussion. Will surely keep the limit in mind.