The answer is to enable partition pruning, use job bookmarks, and work with DynamicFrames. Job bookmarks are the core mechanism for AWS Glue incremental processing, as they track previously processed data in Parquet or other formats, ensuring only new or changed records are read from the source S3 bucket. DynamicFrames handle schema evolution gracefully, which is critical when source Parquet files may have varying columns over time, while partition pruning limits reads to only the relevant year, month, and day partitions, drastically reducing scan costs. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of combining incremental ETL with cost optimization—a common trap is selecting Spark SQL, which lacks native bookmark support, or JobWatch, which isn’t a real Glue feature. Remember the mnemonic “BDP” for Bookmarks, DynamicFrames, and Partition pruning to lock in the correct trio for efficient incremental pipelines.
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 is designing a data transformation pipeline using AWS Glue. The source data is in Amazon S3 in Parquet format, and the transformed output must be written to another S3 bucket in Parquet format partitioned by year, month, day. The pipeline should handle incremental updates efficiently. Which three features should the engineer use? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Glue job bookmarks to track processed data
Options A, B, and D are correct. Bookmarks track processed data for incremental jobs. DynamicFrames are flexible for schema evolution. Partition pruning helps read only relevant partitions. Option C (Spark SQL) is not specific to incremental. Option E (JobWatch) is not an AWS Glue feature.
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.
✓
AWS Glue job bookmarks to track processed data
Why this is correct
Enables incremental processing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS Glue JobWatch for monitoring job progress
Why it's wrong here
JobWatch is not an AWS service; CloudWatch is used.
✓
Use DynamicFrames instead of Spark DataFrames for schema handling
Why this is correct
DynamicFrames handle schema changes gracefully.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable partition pruning in the Glue job
Why this is correct
Reduces data scanned by reading only relevant partitions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Spark SQL for transformations
Why it's wrong here
Not specific to incremental or partitioning.
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: AWS Glue job bookmarks to track processed data — Options A, B, and D are correct. Bookmarks track processed data for incremental jobs. DynamicFrames are flexible for schema evolution. Partition pruning helps read only relevant partitions. Option C (Spark SQL) is not specific to incremental. Option E (JobWatch) is not an AWS Glue feature.
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.
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Question Discussion
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