A dashboard query against two gold Delta tables finished in about 40 seconds when the warehouse was cold. Minutes later, the exact same query returned in two seconds, although no files had changed. The team concluded that the warehouse 'warmed up' and now expects every rerun to be fast. What actually explains the second run?
Reveal answer
Correct answer: The result cache served the identical query without re-execution, since the underlying tables had not changed
Reference: https://docs.databricks.com/aws/en/sql/user/queries/query-profile
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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 (D): The result cache served the identical query without re-execution, since the underlying tables had not changed
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