topic Re: Top 10 - DAX formula optimization in DAX Commands and Tips

Top 10 - DAX formula optimization

danm — Tue, 01 Dec 2020 02:11:40 GMT

Hi Experts,

I try to create a measure to create Top 1o Customer by number of products bought.
I use the following formulas:

Customer Rank = RANKX(ALL(Sales_Fact[CustomerNumber]), [Total Sales], ,ASC)

Top 10 Customers by Prod # =
VAR
RankingContext = VALUES( Account_Dim[Name] )
RETURN
CALCULATE( [No of unique Products],
TOPN( 10, ALL( Account_Dim[Name] ), [No of unique Products] ),
RankingContext ).

The problem is taking around 5 min to display a table with 10 CustomerName and Rank. The tables are not huge: Account aprox 90.ooo rows and Sales aprox 120.000. The memory and cpu used around 30-40%.

Any help would be very much appreciated!

Re: Top 10 - DAX formula optimization

danm — Tue, 01 Dec 2020 02:16:10 GMT

No of unique Products = DISTINCTCOUNT(Sales_Fact[ProductNumber])

Re: Top 10 - DAX formula optimization

amitchandak — Tue, 01 Dec 2020 02:36:58 GMT

danm , do you have any bi-directional joins. and having a slicer for those bi-directional joins. Make bi-directional join and try .

Small variation in second formula

No of unique Products = DISTINCTCOUNT(Sales_Fact[ProductNumber])

Top 10 Customers by Prod # =
CALCULATE( [No of unique Products],
TOPN( 10, ALL( Account_Dim[Name] ), [No of unique Products] ),
VALUES( Account_Dim[Name] ) )

Re: Top 10 - DAX formula optimization

danm — Tue, 01 Dec 2020 02:54:39 GMT

Hi @amitchandak

I activated cross filter direction = both, changed the formula but there is no changes.

Not sure about the slicer

Re: Top 10 - DAX formula optimization

amitchandak — Tue, 01 Dec 2020 05:53:13 GMT

danm , In the model view, check relations and try to convert 1-M relation as single direction relation

Re: Top 10 - DAX formula optimization

AlB — Tue, 01 Dec 2020 08:55:32 GMT

Hi danm

I'd need more details on the model, visual where measures are used etc. Can you share the pbix?

The name for the measure [Top 10 Customers by Prod #] is a bit confusing, given what it seems to do.

Try this in the meantime:

Top 10 Customers by Prod # V2 = VAR rank_ = RANKX ( ALL ( Account_Dim[Name] ), [No of unique Products] ) RETURN IF ( rank_ <= 10, [No of unique Products] )

Please mark the question solved when done and consider giving a thumbs up if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers

Re: Top 10 - DAX formula optimization

danm — Tue, 01 Dec 2020 10:36:36 GMT

Thank you AlB !

Is simple and fast ! Great solution. We all appreciate if you add some comments to point us in right direction.

Cheers

Re: Top 10 - DAX formula optimization

AlB — Tue, 01 Dec 2020 18:08:12 GMT

danm

Essentially it is doing what you did in a more direct way. Your code was a bit convoluted.

To be quite honest though, I wouldn't expect the improvement to be really big ex ante. I'd need to see the full pbix to be able to provide a more accurate answer.

Please mark the question solved when done and consider giving a thumbs up if posts are helpful.

Contact me privately for support with any larger-scale BI needs, tutoring, etc.

Cheers