DEA-C01 Data Ingestion and Transformation Practice Question
A company has a large volume of CSV files in S3 that need to be transformed into Parquet using AWS Glue. The files are partitioned by date. The engineer wants to minimize costs by processing only new files each day. Which approach should be used?
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
✓
Enable job bookmarks in the Glue job.
Using a Job Bookmark in Glue tracks processed data and skips already processed files, processing only new ones. Option A is wrong because it would reprocess all files. Option B is wrong because partitioning alone does not prevent reprocessing. Option D is wrong because an SQS event can trigger a job, but without bookmarks, it may still reprocess.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use S3 partition discovery to automatically read new partitions.
Why it's wrong here
Partition discovery does not prevent reprocessing of existing data.
- ✗
Schedule the Glue job to run daily and process all files.
Why it's wrong here
Processes all files every day, increasing cost.
- ✓
Enable job bookmarks in the Glue job.
Why this is correct
Bookmarks track processed data and skip already processed files.
- ✗
Use S3 Event Notifications to trigger the Glue job on each new file.
Why it's wrong here
This triggers the job for each file, but may still reprocess if not careful.
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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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.