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 creates an AWS Glue job using this CloudFormation template. The job processes new data files in S3 and uses job bookmarks to track processed files. After initial success, the job runs again but processes all files again instead of only new ones. What is the most likely cause?
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.
Network Topology
A
The job bookmark option is set to 'job-bookmark-disable'
Why wrong: The template shows 'job-bookmark-enable', so it is enabled.
B
The enable-metrics parameter is set to true
Why wrong: Metrics are for monitoring, not bookmarking.
C
The MaxRetries parameter is set to 0
Why wrong: MaxRetries does not affect bookmark behavior.
D
The S3 input path does not have a partitioning scheme or timestamp to identify new files
Job bookmarks rely on partition structure or file timestamps to track progress.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 input path does not have a partitioning scheme or timestamp to identify new files
Option D is correct because AWS Glue job bookmarks rely on the structure of the input data to identify new files. Without a partitioning scheme or a timestamp-based naming convention in the S3 path, Glue cannot determine which files are new; it falls back to reprocessing all files. The job bookmark feature tracks processed files by examining the S3 path and file metadata, so a flat or non-partitioned structure prevents it from distinguishing new files from old ones.
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-disable'
Why it's wrong here
The template shows 'job-bookmark-enable', so it is enabled.
✗
The enable-metrics parameter is set to true
Why it's wrong here
Metrics are for monitoring, not bookmarking.
✗
The MaxRetries parameter is set to 0
Why it's wrong here
MaxRetries does not affect bookmark behavior.
✓
The S3 input path does not have a partitioning scheme or timestamp to identify new files
Why this is correct
Job bookmarks rely on partition structure or file timestamps to track progress.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume job bookmarks automatically track any new files in S3, but they fail to realize that without a partitioning scheme or timestamp in the path, Glue cannot differentiate new files from existing ones, leading to full reprocessing.
Trap categories for this question
Command / output trap
The template shows 'job-bookmark-enable', so it is enabled.
Detailed technical explanation
How to think about this question
AWS Glue job bookmarks work by storing state information in a persistent metadata store, tracking the last processed file or partition. For S3 sources, Glue uses the 'last modified' timestamp and the file path to determine new files; without a partition scheme (e.g., year=2024/month=01/day=15) or a timestamp in the filename, Glue cannot reliably identify incremental data. In practice, this means data engineers must design S3 layouts with Hive-style partitions or include timestamps in filenames to enable efficient incremental processing with job bookmarks.
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.
TExam Day Tips
→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.
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
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 S3 input path does not have a partitioning scheme or timestamp to identify new files — Option D is correct because AWS Glue job bookmarks rely on the structure of the input data to identify new files. Without a partitioning scheme or a timestamp-based naming convention in the S3 path, Glue cannot determine which files are new; it falls back to reprocessing all files. The job bookmark feature tracks processed files by examining the S3 path and file metadata, so a flat or non-partitioned structure prevents it from distinguishing new files from old ones.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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
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.