Simplifying DAX Code

Anonymous — Tue, 09 Aug 2022 17:36:08 GMT

Hi All, My PBI reports are working just fine but the problem is, it's having performance issue in my actual pbi, loading takes too much of time. But in my mockup pbi it's working fine. i think this is due to long queries of the dax measures.

Two measure that's needing simplifications

Status expected measure: =

VAR _latestdate =

CALCULATE (

MAX ( Student[Application Date] ),

ALLEXCEPT ( Student, Student[Student ID] )

)

VAR _maxstatuskey =

MAXX (

FILTER (

ALL ( Student ),

Student[Student ID] = MAX ( Student[Student ID] )

&& Student[Application Date] = _latestdate

Student[Application Status Key]

)

RETURN

IF (

HASONEVALUE ( Student[Student ID] ),

CALCULATETABLE (

VALUES ( 'Status'[Status] ),

'Status'[Application Status Key] = _maxstatuskey

)

Application date measure: =

VAR _latestdate =

CALCULATE (

MAX ( Student[Application Date] ),

ALLEXCEPT ( Student, Student[Student ID] )

)

RETURN

IF( HASONEVALUE(Student[Student ID]),

_latestdate)

Mockup result which is correct:

pbi file

I need to apply the same logic from the mockup pbi to my actual pbi and it's having performance issues, and i believe this is due to the long dax queries.Hoping that someone can guide me on this, thank you!

Re: Simplifying DAX Code

colacan — Tue, 09 Aug 2022 18:14:06 GMT

Hi, propably the perfermance issue casued by

MAXX ( <== Iterator

FILTER ( <== Iterator

ALL ( Student ), <== all Student table

you are using nested iterator which means it double iterates all student table. the quick kill would be All(Student[Student ID], Student[Application Date]) instead of iterating ALL(Student) table. even batter way is try to avoid using nested iterator for big table.
I recommend to watch this video: https://www.youtube.com/watch?v=UtDP8KnWXy8

I hope this helps you.

Thank you

topic Simplifying DAX Code in DAX Commands and Tips

Simplifying DAX Code

Re: Simplifying DAX Code