Databricks Data Engineer Professional Practice Questions - Databricks Certified Data Engineer Professional Exam

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A structured streaming job writes to Delta through `foreachBatch`. The job may be restarted after failures, and duplicate output must be avoided. Which design is best?

Write in append mode without a checkpoint Collect the micro-batch to the driver before writing Delete the target and replay the full source after every restart Use a stable checkpoint and make each micro-batch idempotent, for example with `MERGE` on a business key

Correct Answer:

Use a stable checkpoint and make each micro-batch idempotent, for example with `MERGE` on a business key

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