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Exam Certified Data Engineer Professional All Questions

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Exam Certified Data Engineer Professional topic 1 question 140 discussion

Actual exam question from Databricks's Certified Data Engineer Professional
Question #: 140
Topic #: 1
[All Certified Data Engineer Professional Questions]

Which statement describes Delta Lake optimized writes?

  • A. Before a Jobs cluster terminates, OPTIMIZE is executed on all tables modified during the most recent job.
  • B. An asynchronous job runs after the write completes to detect if files could be further compacted; if yes, an OPTIMIZE job is executed toward a default of 1 GB.
  • C. A shuffle occurs prior to writing to try to group similar data together resulting in fewer files instead of each executor writing multiple files based on directory partitions.
  • D. Optimized writes use logical partitions instead of directory partitions; because partition boundaries are only represented in metadata, fewer small files are written.
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Suggested Answer: C 🗳️

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Farid77
3 weeks, 5 days ago
B is correct. C is wrong OPTIMIZE is a separate process from write.
upvoted 1 times
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vexor3
3 months, 2 weeks ago
Selected Answer: C
C is correct
upvoted 2 times
only_vimal
2 months, 4 weeks ago
Please provide your input to Questions 144,145,146,147,149 also. Thanks in advance
upvoted 1 times
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