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?
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.
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
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
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