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Exam AZ-300 topic 2 question 32 discussion

Actual exam question from Microsoft's AZ-300
Question #: 32
Topic #: 2
[All AZ-300 Questions]

You create an Azure Time Series Insights event handler. You need to send data over the network as efficiently as possible and optimize query performance.
What should you do?

  • A. Create a query plan
  • B. Send all properties
  • C. Use a Tag ID
  • D. Use reference data
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
References:
https://docs.microsoft.com/en-us/azure/time-series-insights/how-to-shape-query-json

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JakeCallham
Highly Voted 5 years, 6 months ago
Answer D: see https://docs.microsoft.com/en-us/azure/time-series-insights/time-series-insights-add-reference-data-set
upvoted 6 times
levm39
5 years, 5 months ago
can you explain, the link you mentioned does not explain the scenario, how creating a reference data set , sends dat over the network??
upvoted 1 times
SilentH
5 years, 4 months ago
The link describes reference data as a way to "reduce the number of bytes transferred over the network" thus best answering the question's requirement which is to "send data over the network as efficiently as possible". Also, in the link for scenario one, it describes reference data as joining two attributes (messageId and deviceLocation) which meets the question's requirement to optimize query performance. The answer is D.
upvoted 13 times
tartar
4 years, 9 months ago
D is ok
upvoted 2 times
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milind8451
Highly Voted 5 years, 1 month ago
I think this is from Azure IOT and this topic isn't included in AZ-300.
upvoted 6 times
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BOC
Most Recent 4 years, 9 months ago
Reference data is used to reduce the number of bytes transferred over the network. Correct answer is D
upvoted 1 times
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kondapaturi
5 years ago
D - Use reference data - correct Reference data is used to reduce the number of bytes transferred over the network. The two attributes messageId and deviceLocation are joined by using the key property deviceId. This data is joined with the telemetry data at ingress time and is then stored in Time Series Insights for querying
upvoted 3 times
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mihlo74
5 years, 4 months ago
I'd say this reference: https://docs.microsoft.com/en-us/azure/time-series-insights/how-to-shape-query-json is more clear... it points best practices and why, for both, improve performance and also Send data over the network as efficiently as possible, so D is ok
upvoted 3 times
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