DEA-C01 Data Operations and Support Practice Question
A company uses Amazon S3 to store raw data files. An AWS Glue crawler creates metadata in the Data Catalog. The data engineer discovers that the crawler is not detecting new partitions after new data is added to the S3 bucket. What is the MOST likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The IAM role used by the crawler does not have kms:Decrypt permission for the KMS key that encrypts the new partitions.
When new partitions are added to an S3 bucket encrypted with AWS KMS (SSE-KMS), the AWS Glue crawler needs the kms:Decrypt permission to read the object metadata and detect the new partitions. Without this permission, the crawler cannot list the objects or determine the partition structure, so it fails to update the Data Catalog. Option B is incorrect because the crawler's partition detection is not disabled by default; the 'Crawl all folders' setting is for crawling subfolders, not for partition detection. Option C is incorrect because AWS Glue crawlers can handle large numbers of objects, and there is no specific limit that would prevent partition detection. Option D is incorrect because S3 event notifications are not required for crawling; the crawler periodically scans the S3 location and does not rely on events to detect changes.
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 used by the crawler does not have kms:Decrypt permission for the KMS key that encrypts the new partitions.
Why this is correct
Without decrypt permission, the crawler cannot read the data.
- ✗
The crawler configuration has 'Crawl all folders' disabled.
Why it's wrong here
If disabled, crawler would not crawl any new folders, but the issue is specifically with new partitions.
- ✗
The S3 bucket has too many objects, exceeding the crawler's limit.
Why it's wrong here
Crawlers can handle millions of objects.
- ✗
The crawler does not have S3 event notifications enabled.
Why it's wrong here
Crawlers do not rely on event notifications; they scan the bucket.
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 |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.