The correct approach is to enable job bookmarks in the Glue ETL job, as this built-in feature automatically tracks the last processed files in S3 and ensures only new data is processed in subsequent runs. Job bookmarks work by persisting state information about previously processed data, allowing the job to skip already-scanned files and focus solely on incremental processing with AWS Glue job bookmarks. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of stateful ETL patterns versus stateless triggers; a common trap is confusing S3 Event Notifications (which trigger jobs but don’t track progress) with job bookmarks (which handle deduplication natively). Remember that bookmarks are ideal for scheduled, recurring jobs where you need to process only new or changed data without writing custom tracking logic. Memory tip: think of a bookmark in a book—it marks your last page so you never re-read old pages.
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer needs to schedule an AWS Glue ETL job to run every hour and process new data that arrives in an S3 bucket. The job should only process files that have been added since the last run. Which approach should the engineer use to track which files have been processed?
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 ETL job.
Option B is correct because Glue job bookmarks automatically track the last processed files in S3 and only process new data in subsequent runs. Option A is wrong because S3 Event Notifications can trigger the job but do not track processed files; the job would need to handle deduplication. Option C is wrong because a DynamoDB table would require custom code to track state. Option D is wrong because checking last modified timestamp manually is error-prone and not built-in.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure S3 Event Notifications to trigger the Glue job on each new object creation.
Why it's wrong here
Event notifications can trigger the job but the job would need to track processed files itself to avoid reprocessing.
✓
Enable job bookmarks in the Glue ETL job.
Why this is correct
Glue job bookmarks automatically track the state of data processed and only process new data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store the last processed timestamp in a DynamoDB table and query it at the start of the job.
Why it's wrong here
This adds complexity and requires custom logic; Glue bookmarks handle this natively.
✗
Use S3 Inventory to list all objects and filter by last modified date in the job.
Why it's wrong here
S3 Inventory is a daily report, not real-time, and requires additional processing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable job bookmarks in the Glue ETL job. — Option B is correct because Glue job bookmarks automatically track the last processed files in S3 and only process new data in subsequent runs. Option A is wrong because S3 Event Notifications can trigger the job but do not track processed files; the job would need to handle deduplication. Option C is wrong because a DynamoDB table would require custom code to track state. Option D is wrong because checking last modified timestamp manually is error-prone and not built-in.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.