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reynold522
Helper II
Helper II

Optimization of the measure coding

We have more than 50 IoT devices.
 
each IoT device provide voltage for every 4millisecond, we calcualte deep discharge with voltage<1.8V.
I did following measure with formula writen:
Deep Discharge hours = Calculate(COUNT(Table[BATTVOLTAGE]), Filter(table,table[BATTVOLTAGE]<=1.8))/900
*******/900 as sample rate 4 ms********
 
I put this calculated value in a table view:
 
coloum 1: IoT device Number
coloum 2: Deep Discharge hours
 
it works when I filter the duration to the latest day
It wont work when i filter the duration to latest 2+ days with hint: the resulteset of   a query to external data source has exceeded the maximum allowed size of 1000000 rows.
 
is there a way to optimized the code or do it in some other ways so that I can have longer period evaluation than just one day?
 
Thanks in advance!
 
Best regards
 
 
1 ACCEPTED SOLUTION
Greg_Deckler
Super User
Super User

@reynold522 Sounds like this is DirectQuery, yes? In that case, I suggest you implement an Aggregation table if you have not already. User-defined aggregations - Power BI | Microsoft Learn


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Greg_Deckler
Super User
Super User

@reynold522 Sounds like this is DirectQuery, yes? In that case, I suggest you implement an Aggregation table if you have not already. User-defined aggregations - Power BI | Microsoft Learn


Follow on LinkedIn
@ me in replies or I'll lose your thread!!!
Instead of a Kudo, please vote for this idea
Become an expert!: Enterprise DNA
External Tools: MSHGQM
YouTube Channel!: Microsoft Hates Greg
Latest book!:
The Definitive Guide to Power Query (M)

DAX is easy, CALCULATE makes DAX hard...

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