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Exam Certified Data Engineer Professional All Questions

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Exam Certified Data Engineer Professional topic 1 question 159 discussion

Actual exam question from Databricks's Certified Data Engineer Professional
Question #: 159
Topic #: 1
[All Certified Data Engineer Professional Questions]

A junior data engineer is migrating a workload from a relational database system to the Databricks Lakehouse. The source system uses a star schema, leveraging foreign key constraints and multi-table inserts to validate records on write.

Which consideration will impact the decisions made by the engineer while migrating this workload?

  • A. Databricks only allows foreign key constraints on hashed identifiers, which avoid collisions in highly-parallel writes.
  • B. Foreign keys must reference a primary key field; multi-table inserts must leverage Delta Lake’s upsert functionality.
  • C. Committing to multiple tables simultaneously requires taking out multiple table locks and can lead to a state of deadlock.
  • D. All Delta Lake transactions are ACID compliant against a single table, and Databricks does not enforce foreign key constraints.
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Suggested Answer: D 🗳️
by hpkr at June 12, 2024, 6:32 p.m.

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hpkr
5 months, 2 weeks ago
Selected Answer: D
D is correct
upvoted 3 times
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