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cte_crest
Helper I
Helper I

Count mismatch in the data imported from Azure log analytics workspace through blank query

Hi, 

I am using exported Power query in the Blank Query option of data collection to import the data from Azure Log Analytics Workspace. I am publishing this report to the Power BI service.

 

Whenever I refresh the dataset in Power BI service, the number of ids retrieved in Power BI Service is inconsistent with the actual records present using the same query in Azure Log Analytics Workspace.  The count of records on Azure log Analytics Workspace is 82647, while the records received in the service is just 78310. Below are the images, attached for reference:

Screenshot (114).png

Screenshot (115).png

 

Is there any reason why this would occur?

 

I am following the steps mentioned here:  https://docs.microsoft.com/en-us/azure/azure-monitor/platform/powerbi

2 REPLIES 2
v-diye-msft
Community Support
Community Support

Hi @cte_crest 

 

Kindly note the limitation that violated the 64,000,000 bytes maximum enforced by the Log Analytics API. Kindly re-architect the queries with this limitation in mind.  The Log Analytics API limitations are documented here:

 

https://dev.loganalytics.io/documentation/Using-the-API/Limits

 

Community Support Team _ Dina Ye
If this post helps, then please consider Accept it as the solution to help the other members find it more
quickly.

@v-diye-msft 

Actually I am respecting all the API limitations. In fact, the payload from the response is just 5 MB (vs 60 MB limit).

 

In addition, I am noticing a weird behaviour. If the count on azure workspace is 82647, then it's fetching 78310 in Power BI. If the count in azure workspace is 105k, then around 95k records are fetched. 

 

So, why am I experiencing these inconsistencies? Are there any other limitations also?

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