Which of the following is an example of unstructured data?

A CSV file with customer records

A data engineer notices that an Amazon EMR job that used to complete in 30 minutes now takes over 2 hours. The job processes data from S3 and writes results back to S3. The cluster has 10 core nodes and 20 task nodes. What is the most likely cause of the performance degradation?

The cluster's EBS volumes are full.

The job's output format was changed from Parquet to CSV.

The number of files in the S3 input path has increased significantly.

The S3 bucket has been moved to a different region.

A data engineer needs to expose processed data from an Amazon DynamoDB table to external applications via a REST API. Which combination of AWS services is most appropriate?

Amazon S3 and Amazon CloudFront

Amazon API Gateway and AWS Lambda

A company runs a data processing workload on Amazon ECS using Fargate. The workload is memory-intensive and occasionally experiences out-of-memory errors. The task definition currently allocates 2 GB memory and 1 vCPU. What should the data engineer do to resolve the issue?

Add a second container to the task to share the load.

Increase the memory allocation to 4 GB and keep the vCPU at 1.

Switch from Fargate to EC2 launch type to have more control over memory.

Increase the vCPU to 2 and keep the memory at 2 GB.

AWSCertified Data Engineer - Associate

Domain 1Objective 2

Task 1.2: Transform and Process Data 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 29 practice questions to prepare you well beyond it. (estimate)

29questions here

6free pages

10concepts

34%of the exam

Questions 16–20

16foundation · easy
Which of the following is an example of unstructured data?
Select an answer first
17expert · hard
A data engineer notices that an Amazon EMR job that used to complete in 30 minutes now takes over 2 hours. The job processes data from S3 and writes results back to S3. The cluster has 10 core nodes and 20 task nodes. What is the most likely cause of the performance degradation?
Select an answer first
18foundation · easy
A data engineer needs to expose processed data from an Amazon DynamoDB table to external applications via a REST API. Which combination of AWS services is most appropriate?
Select an answer first
19foundation · easy
Which AWS service allows you to build, train, and deploy custom machine learning models, including large language models, in a fully managed environment?
Select an answer first
20application · medium
A company runs a data processing workload on Amazon ECS using Fargate. The workload is memory-intensive and occasionally experiences out-of-memory errors. The task definition currently allocates 2 GB memory and 1 vCPU. What should the data engineer do to resolve the issue?
Select an answer first

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