DP-203 Certification Practice Question #141

Question

You plan to build a structured streaming solution in Azure Databricks. The solution will count new events in five-minute intervals and report only events that arrive during the interval. The output will be sent to a Delta Lake table.
Which output mode should you use?

Accepted Answer

The question asks to report only events that arrive during each five-minute interval, not to continuously revise prior results. In Structured Streaming, that behavior maps to **append** mode once windowed counts are finalized and written out to Delta Lake. Update and complete are used when the sink should reflect intermediate or full aggregate-state changes, which is not the requirement here.

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