The correct answer is that the Glue Data Catalog partition metadata is outdated after the S3 structure changed. This is the most likely cause of an AWS Glue partition mismatch error because the Data Catalog stores a static snapshot of your partition layout, and when you add, remove, or rename partitions directly in Amazon S3 without updating the catalog, Glue jobs will fail when they try to read data using the old partition keys. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of how Glue crawlers and the Data Catalog maintain schema consistency—a common trap is assuming the catalog auto-syncs with S3 changes, but it does not; you must run a crawler or use the MSCK REPAIR TABLE command to refresh the metadata. A helpful memory tip is to think of the catalog as a map: if you change the roads in S3 but don’t update the map, your job will get lost.
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.
A company uses AWS Glue to process data in Amazon S3. The Glue job fails with an error indicating that the partition keys in the catalog do not match the actual S3 partition structure. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Glue Data Catalog partition metadata is outdated after the S3 structure changed
Option B is correct because partition structure changes in S3 (e.g., adding a new partition) mean the catalog must be updated via a crawler. Option A is wrong because IAM permissions would cause a different error. Option C is wrong because encryption would cause decryption errors. Option D is wrong because a table name mismatch would result in a 'table not found' error.
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 IAM role does not have permissions to read the S3 data
Why it's wrong here
This would cause an access denied error, not a partition mismatch.
✗
The data files are encrypted with SSE-KMS
Why it's wrong here
Encryption does not cause partition key mismatch errors.
✗
The table name in the catalog is different from the one used in the job
Why it's wrong here
This would result in a 'table not found' error, not partition mismatch.
✓
The Glue Data Catalog partition metadata is outdated after the S3 structure changed
Why this is correct
The catalog must be refreshed by running a crawler to reflect S3 changes.
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
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 Glue Data Catalog partition metadata is outdated after the S3 structure changed — Option B is correct because partition structure changes in S3 (e.g., adding a new partition) mean the catalog must be updated via a crawler. Option A is wrong because IAM permissions would cause a different error. Option C is wrong because encryption would cause decryption errors. Option D is wrong because a table name mismatch would result in a 'table not found' error.
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.
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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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