DEA-C01 Data Operations and Support Practice Question
A data engineer is monitoring an Amazon Redshift cluster and notices that the disk space usage is increasing rapidly. The engineer wants to reclaim space from deleted rows. Which command should the engineer run?
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
✓
VACUUM
The VACUUM command in Amazon Redshift reclaims disk space from deleted rows and reorganizes the data to improve query performance. Option B is wrong because ANALYZE updates statistics for the query optimizer, not reclaims space. Option C is wrong because UNLOAD exports data from the cluster to Amazon S3. Option D is wrong because COPY loads data from files into the cluster.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
VACUUM
Why this is correct
VACUUM reclaims space from deleted rows.
- ✗
ANALYZE
Why it's wrong here
ANALYZE updates statistics, does not reclaim space.
- ✗
UNLOAD
Why it's wrong here
UNLOAD exports data.
- ✗
COPY
Why it's wrong here
COPY loads data.
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 |
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JA
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.