A streaming pipeline commits new data to catalog.ops.events every 30 seconds. After a few months, the Delta table holds hundreds of thousands of small files, and dashboard queries have degraded: execution time is dominated by listing and opening files rather than scanning data. Which maintenance action restores read performance?
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Correct answer: Run OPTIMIZE, which compacts the small files into larger ones for more efficient reads
Reference: https://docs.databricks.com/aws/en/delta/best-practices
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02 — The Myelin Layer · Canonical Discussion
Where the exam tries to trick you — and how those who passed solved it.
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Official Answer (B): Run OPTIMIZE, which compacts the small files into larger ones for more efficient reads
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