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bikeoholic's avatar
bikeoholic
Frequent Visitor
5 years ago
Solved

Count in SCD2 dimension - optimization

Hello PB community!   Can anybody please help me with DAX optimization in this scenario: I have Tabular model with 10 dimension tables, no real facts. One of the user request is to count units in ...
COUNT
Countdistinct
SCD2
  • AlB's avatar
    AlB
    5 years ago

    bikeoholic 

    Pending the response to my questions above, try this:

    Cnt of units V2 :=
CALCULATE (
    SUMX ( VALUES ( 'Units'[unit_id] ), 1 ),
    VAR minDate_ =MIN ( 'CalendarTable'[Date] )
    VAR maxDate_ = MAX ( 'CalendarTable'[Date] )
    RETURN
        FILTER (
            ALL ( 'Units'[unit_valid_from], 'Units'[unit_valid_to] ),
            NOT ( maxDate_ < 'Units'[unit_valid_from]
                || minDate_ > 'Units'[unit_valid_to] )
        )
)

     

    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 

AlB's avatar
AlB
Icon for Community Champion rankCommunity Champion
5 years ago

bikeoholic 

4 secs is still considerable and it's engaging the FE significantly.  I'm curious if this version will be faster:

Cnt of units V2_B :=
VAR minDate_ =
    MIN ( 'CalendarTable'[Date] )
VAR maxDate_ =
    MAX ( 'CalendarTable'[Date] )
RETURN
    COUNTROWS (
        FILTER (
            ALL ( 'Units'[unit_id], 'Units'[unit_valid_from], 'Units'[unit_valid_to] ),
            NOT ( maxDate_ < 'Units'[unit_valid_from]
                || minDate_ > 'Units'[unit_valid_to] )
        )
    )

 or this:

Cnt of units V2_C :=
VAR minDate_ =
    MIN ( 'CalendarTable'[Date] )
VAR maxDate_ =
    MAX ( 'CalendarTable'[Date] )
RETURN
    COUNTROWS (
        FILTER (
            ALL ( 'Units'[unit_id], 'Units'[unit_valid_from], 'Units'[unit_valid_to] ),
             maxDate_ >= 'Units'[unit_valid_from] && minDate_ <= 'Units'[unit_valid_to]
        )
    )

 

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