10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The DEA-C01 exam has 65 questions and runs 2 hours 10 minutes.
These 10 free DEA-C01 questions are organized by exam domain, so you can see how each part of the AWS Certified Data Engineer - Associate (DEA-C01) blueprint is tested. Reveal the answer and explanation under each question.
A data engineer must process clickstream events continuously and replay events after failures. Which approach best fits this requirement?
Correct answer: B - Use Amazon Kinesis Data Streams with retention for replay
A CSV dataset is converted to Apache Parquet before analytics processing. What is the main benefit?
Correct answer: A - Columnar storage efficiency and improved analytics performance
A Step Functions ETL workflow fails because a downstream service temporarily rejects requests. What design improvement is most appropriate?
Correct answer: B - Add retry and error handling for transient failures
A team needs repeatable deployment of data infrastructure across accounts. Which practice should be used?
Correct answer: B - Infrastructure as code with CloudFormation or CDK
A workload requires very low-latency key-value access. Which service matches this pattern?
Correct answer: A - Amazon MemoryDB for Redis
A data lake requires evolving tables using an open table format. Which technology should be considered?
Correct answer: A - Apache Iceberg
An application performs approximate nearest-neighbor searches on embeddings. Which concepts are relevant?
Correct answer: A - HNSW and IVF vector indexes
Older S3 objects should automatically move to cheaper storage after a defined period. Which feature should be configured?
Correct answer: A - S3 Lifecycle rules
Application logs are stored in CloudWatch Logs and must be queried using SQL-style analysis. Which service helps?
Correct answer: A - Amazon Athena
A SQL query calculates average sales over the previous 30 days for each store. Which concept is used?
Correct answer: A - Rolling average
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