Help to improve my Dax

[AliAlHamadi]

Hello, 

I need help to improve my Dax code, it take a lot of my memory and can't apply for huge data it's only work for 20,000 to 30,000 row but my data more than Million row I'm trying to find duration minute between connected and Disconnected for every user.

this my code 

Duration =
VAR __thislogin = Sheet1 [Time]
VAR __nextlogout =
    CALCULATE (
        MIN (Sheet1 [Time]),
        ALLEXCEPT (Sheet1, Sheet1 [UserID]),
        Sheet1 [Time]> __thislogin,
        Sheet1 [EventType] = "DISCONNECTED"
    )
RETURN
    IF (
        Sheet1 [EventType] = "CONNECTED",
        DATEDIFF (__thislogin, __nextlogout, MINUTE),
        BLANK ()
    )

 and this my data 

it will be better to find why doing it in power query editor but in don't a lot of M code.

I just add sample of my data, only 2000 row

https://drive.google.com/file/d/1gBrDVx7CJJJ2F0cZzLnNdoZetKNV96HW/view?usp=sharing

[AliAlHamadi]

I edit my post with excel and power bi files

[ImkeF]

To get the value from the next row, you can use the function from this blogpost: https://www.thebiccountant.com/2018/07/12/fast-and-easy-way-to-reference-previous-or-next-rows-in-po... (the second function has a parameter to get the next row instead of the prevsious row).

But you have to apply it on UserID-level like described here: https://www.thebiccountant.com/2018/09/30/memory-efficient-clustered-running-total-in-power-bi/

DAX simply needs too much RAM for these kinds of calculations, unfortunately.

[v-xicai]

Hi @AliAlHamadi ,

You may create this [Duration] using measure instead of calculated column.

Duration =
VAR __thislogin = SELECTEDVALUE( Sheet1 [Time])
VAR __nextlogout =
    CALCULATE (
        MIN (Sheet1 [Time]),
        ALLEXCEPT (Sheet1, Sheet1 [UserID]),
        Sheet1 [Time]> __thislogin,
        Sheet1 [EventType] = "DISCONNECTED"
    )
RETURN
    IF (
       MAX( Sheet1 [EventType] )= "CONNECTED",
        DATEDIFF (__thislogin, __nextlogout, MINUTE),
        BLANK ()
    )

You can also refer to the links to improve the performance:

https://docs.microsoft.com/en-us/power-bi/guidance/power-bi-optimization

https://maqsoftware.com/expertise/powerbi/dax-best-practices

Best Regards,

Amy 

Community Support Team _ Amy

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[AliAlHamadi]

The measure give me blank value.

[amitchandak]

@ImkeF , can you suggest some M code for this