Question 720
A critical monthly report slows dramatically after a new data release. Following Run result-equivalence and data-quality regression before accepting the optimization, the incident team needs evidence that A rewrite made the job faster but changes the number of output records. Which observation supports closure?
Explanation
Correct Answer
The final optimized output agrees with the validated baseline directly measures whether Run result-equivalence and data-quality regression before accepting the optimization achieved the requirement “A rewrite made the job faster but changes the number of output records.” It checks the operating result rather than just a configured resource name.
Incorrect Answers
This signal belongs to the adjacent case “The job is spending most time waiting for a cold warehouse to start,” whose remedy is Measure startup separately and change supported warehouse readiness settings. The observed result for the present requirement is The final optimized output agrees with the validated baseline.
Scan/file metrics identify the additional read volume would demonstrate the separate action Inspect file pruning, statistics and changed data layout, which addresses “The report reads more files than before despite unchanged filter semantics.” It does not verify the requirement “A rewrite made the job faster but changes the number of output records” following Run result-equivalence and data-quality regression before accepting the optimization.
This signal belongs to the adjacent case “Repeated recomputation of an intermediate DataFrame dominates a notebook,” whose remedy is Persist the justified reused intermediate and release after use. The observed result for the present requirement is The final optimized output agrees with the validated baseline.