DEA-C01 Data Ingestion and Transformation Practice Question
A company stores IoT sensor data in S3 as JSON files. They need to convert the data to Parquet format for efficient querying with Amazon Athena. Which AWS service can perform this transformation with minimal effort?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Glue ETL job
AWS Glue ETL jobs can easily convert JSON to Parquet with built-in transforms. Option A is wrong because Kinesis Data Firehose is for streaming data ingestion, not batch transformations. Option B is wrong because Amazon Athena is a query engine, not a transformation service. Option D is wrong because AWS Lambda is for small, event-driven transformations and is not ideal for large-scale batch conversion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Kinesis Data Firehose
Why it's wrong here
Firehose is for streaming data.
- ✗
Amazon Athena
Why it's wrong here
Athena is for querying, not transforming data.
- ✓
AWS Glue ETL job
Why this is correct
Glue ETL can convert JSON to Parquet.
- ✗
AWS Lambda
Why it's wrong here
Lambda is for small-scale transformations, not large batch conversions.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.