AWS Certified Data Engineer – Associate (DEA-C01)

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Which of the following statements most accurately describes the primary difference between a data lake and a data warehouse in terms of data structure?

A data lake uses a "schema-on-write" approach, while a data warehouse uses "schema-on-read". A data lake stores raw data in its native format, applying structure during analysis ("schema-on-read"). A data warehouse stores data in a normalized form (3NF), while a data lake uses a denormalized star schema. A data lake stores only unstructured data, while a data warehouse stores only structured data.

Correct Answer:

A data lake stores raw data in its native format, applying structure during analysis ("schema-on-read").

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