The correct answer is that the ETL script does not use the transformation_ctx parameter in its DynamicFrame transformations. Glue job bookmarks rely on this parameter to track which data has already been processed; without it, the job has no state to reference and must reprocess the entire dataset on every run. On the AWS Certified Data Engineer Associate DEA-C01 exam, this concept tests your understanding of how incremental processing works in AWS Glue, often appearing as a trick where the job configuration looks correct—bookmarks enabled, script type set to glueetl—but the actual script logic is missing the required context. A common trap is assuming that enabling job bookmarks in the job settings is sufficient, when in fact the transformation_ctx must be explicitly passed to each DynamicFrame transformation like ApplyMapping or Filter. Memory tip: think of transformation_ctx as the bookmark’s “memory chip”—without it, the job has amnesia and starts from scratch every time.
DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Network Topology
Refer to the exhibit. A data engineer runs the AWS CLI command to describe a Glue job. The job is expected to process new data incrementally using job bookmarks. However, the job reprocesses all data every time it runs. What is the MOST likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ETL script does not use the 'transformation_ctx' parameter in its DynamicFrame transformations.
Option B is correct because Glue job bookmarks are only supported when using Spark (glueetl) with the correct script type. The exhibit shows 'Command.Name' is 'glueetl', which is correct. But the issue might be that the script does not use the 'transformation_ctx' parameter properly. However, the exhibit shows '--job-bookmark-option' set to 'job-bookmark-enable', which is correct. Option B is wrong because the command is glueetl. Option A is wrong because bookmarks are enabled. Option C is wrong because MaxRetries does not affect bookmarks. Option D is correct because job bookmarks require the Glue job to read from a source that supports bookmarks (like S3) and the script must use the 'transformation_ctx' to enable bookmarks. But the exhibit doesn't show the script. However, a common reason is that the job's source is not S3 or that the script does not use the 'transformation_ctx' properly. Let me re-express: Option D is the most likely because the script may not be using the 'transformation_ctx' in the DynamicFrame. I'll set D as correct.
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.
✗
The job bookmark option is set to 'job-bookmark-enable' but should be 'job-bookmark-disable'.
Why it's wrong here
Enabling is correct for incremental processing.
✗
The job's MaxRetries is set to 0, which disables bookmarks.
Why it's wrong here
MaxRetries does not affect bookmarks.
✓
The ETL script does not use the 'transformation_ctx' parameter in its DynamicFrame transformations.
Why this is correct
Without transformation_ctx, Glue cannot track bookmarks.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Glue job's command name is 'glueetl', which does not support job bookmarks.
Why it's wrong here
'glueetl' is Spark, which supports bookmarks.
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: The ETL script does not use the 'transformation_ctx' parameter in its DynamicFrame transformations. — Option B is correct because Glue job bookmarks are only supported when using Spark (glueetl) with the correct script type. The exhibit shows 'Command.Name' is 'glueetl', which is correct. But the issue might be that the script does not use the 'transformation_ctx' parameter properly. However, the exhibit shows '--job-bookmark-option' set to 'job-bookmark-enable', which is correct. Option B is wrong because the command is glueetl. Option A is wrong because bookmarks are enabled. Option C is wrong because MaxRetries does not affect bookmarks. Option D is correct because job bookmarks require the Glue job to read from a source that supports bookmarks (like S3) and the script must use the 'transformation_ctx' to enable bookmarks. But the exhibit doesn't show the script. However, a common reason is that the job's source is not S3 or that the script does not use the 'transformation_ctx' properly. Let me re-express: Option D is the most likely because the script may not be using the 'transformation_ctx' in the DynamicFrame. I'll set D as correct.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. A data engineer runs this AWS CLI command to create a Glue job. The job processes JSON files in an S3 bucket and writes Parquet files to another bucket. After the first successful run, the job re-processes all input files instead of only new files. What is the most likely cause?
hard
A.The ScriptLocation points to an incorrect S3 path.
B.The --max-retries parameter is set to 0.
✓ C.The job script does not implement job bookmark support.
D.The IAM role lacks permissions to read bookmark state.
Why C: Option A is correct because the command sets 'job-bookmark-enable', but if the script does not use bookmark APIs, bookmarks won't work. Option B is wrong because max-retries is 0 but that doesn't cause reprocessing. Option C is wrong because the script location is valid. Option D is wrong because the role is specified.
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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
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