A data pipeline reads many small files from Amazon S3 and processes them. The engineer notices that the job spends a large portion of time waiting for file reads. Which optimization is most directly aimed at reducing I/O wait time?

Rewriting the code in a different programming language without changing I/O patterns

Increasing the logging level to DEBUG

Using a single-threaded loop to read files sequentially

Reading files in parallel using multiple threads or async I/O

A data engineering team is developing a new data pipeline. The team wants to ensure that the code is reviewed and tested before it is deployed to production. Which practice should the team implement?

Deploy directly to production from the development branch.

Run tests only after deployment to production.

Use a Git branching strategy with pull requests and run tests in a CI pipeline.

Use a shared drive to store code and manually copy it to production.

A data engineer needs to model a social network's user connections to find the shortest path between two users for a recommendation feature. The data is stored in a table with columns user_id and friend_id. Which data structure and algorithm should the engineer use?

Use a binary search tree and apply an in-order traversal.

Use a graph data structure and apply breadth-first search (BFS).

Use an array and apply a divide-and-conquer algorithm.

Use a hash map and apply a linear scan to find the path.

AWSCertified Data Engineer - Associate

Domain 1Objective 4

Task 1.4: Apply Programming Concepts DEA-C01 Practice Questions (Page 4)

Part of the Content Domain 1: Data Ingestion and Transformation domain, which accounts for 34% of the DEA-C01 exam. AWS does not publish an official question count, but from its 130-minute exam (~50–85 total, ~17–29 in this domain), expect 4–7 from this objective — we provide 33 practice questions to prepare you well beyond it. (estimate)

33questions here

7free pages

10concepts

34%of the exam

Questions 16–20

16foundation · easy
A data pipeline reads many small files from Amazon S3 and processes them. The engineer notices that the job spends a large portion of time waiting for file reads. Which optimization is most directly aimed at reducing I/O wait time?
Select an answer first
17foundation · easy
Which AWS service is a fully managed CI/CD service that can be used to build, test, and deploy data pipeline code?
Select an answer first
18foundation · easy
A data engineer needs to model a social network where users are nodes and friendships are edges. Which data structure is most appropriate?
Select an answer first
19application · medium
A data engineering team is developing a new data pipeline. The team wants to ensure that the code is reviewed and tested before it is deployed to production. Which practice should the team implement?
Select an answer first
20application · medium
A data engineer needs to model a social network's user connections to find the shortest path between two users for a recommendation feature. The data is stored in a table with columns user_id and friend_id. Which data structure and algorithm should the engineer use?
Select an answer first

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Task 1.4: Apply Programming Concepts DEA-C01 Practice Questions (Page 4)

Questions 16–20

A data pipeline reads many small files from Amazon S3 and processes them. The engineer notices that the job spends a large portion of time waiting for file reads. Which optimization is most directly aimed at reducing I/O wait time?

Which AWS service is a fully managed CI/CD service that can be used to build, test, and deploy data pipeline code?

A data engineer needs to model a social network where users are nodes and friendships are edges. Which data structure is most appropriate?

A data engineering team is developing a new data pipeline. The team wants to ensure that the code is reviewed and tested before it is deployed to production. Which practice should the team implement?

A data engineer needs to model a social network's user connections to find the shortest path between two users for a recommendation feature. The data is stored in a table with columns user_id and friend_id. Which data structure and algorithm should the engineer use?

Keep studying — Content Domain 1: Data Ingestion and Transformation