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What are Capacity Units?

Everything you do in Power BI costs Capacity Units (CU). There are two type of measurements. Type 1 ‘Interactive’ is measured every 30s, Type 2 ‘Background’ doesn’t take down a capacity when a lot op CUs are used, but it’s smoothed over time.

Interactive

This means an overload takes place if one or multiple queries within this 30s interval go above the maximum CU’s of a Power BI Capacity.
A interactive action can have a few origins:
  • Full Report Email Subscription
    When a report is sent as a PDF.
  • Query
    When you open or click in a report.
  • Render
    The visuals that are rendered.
  • XMLA Read Operation
    When you call the XMLA Endpoint of a Semantic model
We have an interactive action limit of 30.000 CUs per hour.

Background

Background actions are smoothed over time. For this we have a limit of 2.000.000 CUs per month.
  • Dataflow Refresh
    Every time a dataflow refreshes it will cost CUs.
  • Dataset On-Demand Refresh
    Every time the Semantic Model is refreshed through the Webdashboard Development API.
  • Dataset Scheduled Refresh
    Every time the Semantic Model is refreshed through the Power BI Services Schedule.
 

Performance insights

Webdashboard gives insights into your performance. You can find these insights here:
This report is made so you can easily see if you use too much capacity in the 'My usage against Fair use policy' visual. If the column is red (exceeding the policy). You can see your average per day in a KPI and your overall capacity availablity for 14 days. 
The report is divided bij background and interactive tasks. And presented per hour. Just navigate over a datapoint to see details and have the ability to drill through to an hourly overview of what happend that specific hour.
Then you can see exactly what dataset caused the situation
 
 

Most common issues grouped by operation type

OperationPossible causePossible solution
QueryTable or Matrix with a lot of rowsVisualize the data and make it available through drill through
QueryTable or Matrix with a lot of measures in the Report ViewTry to move the measures to your model as calculated field
Dataset On-Demand RefreshA lot of refreshes are triggered, because data needs to be up to dateTry to only set a refresh for the part of the data that is new, with the Incremental Refresh functionality 
All refreshesTakes a long time to process- Unused columns, you can identify them by opening the dataset overview in Webdashboard
- Limit the complexity by preprocessing your model in Fabric or your DataWareHouse
You can reach out to us if you need any help with any of these issues. Our in-house (Power)-BI consultants can together with you take a look at your data(set). Plan an evaluation call with, or send an e-mail to Bart Cremers (bart.cremers@insumma.nl), and mention you are a Webdashboard customer looking for help with Webdashboard capacity reduction. 

 

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