DBS-C01 Monitoring and Troubleshooting Practice Question
A developer is using AWS Database Migration Service (DMS) to migrate a database from on-premises to Amazon RDS. The migration task is failing with 'Insufficient memory' error. Which resource should be increased to resolve this?
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
✓
Increase the size of the DMS replication instance.
The DMS replication instance may have insufficient memory. Increasing its size provides more memory. Option B is wrong because source database memory is not controlled by DMS. Option C is wrong because S3 is not involved in the DMS process by default. Option D is wrong because target RDS instance memory may not be the bottleneck.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Increase the size of the DMS replication instance.
Why this is correct
Increasing the size of the DMS replication instance provides more memory for the migration task, resolving the 'Insufficient memory' error.
- ✗
Increase the memory on the source database.
Why it's wrong here
The source database memory is not controlled by DMS, so increasing it would not help.
- ✗
Increase the Amazon S3 bucket size for staging.
Why it's wrong here
Amazon S3 is not directly involved in the DMS process by default for this type of migration, so its bucket size is irrelevant.
- ✗
Increase the memory on the target RDS instance.
Why it's wrong here
The target RDS instance memory may not be the bottleneck; the error is related to the DMS replication instance memory.
Visual reference
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 DBS-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 DBS-C01 exam.