DBS-C01 Deployment and Migration Practice Question
A company is migrating a 2 TB Oracle database to Amazon Aurora PostgreSQL using AWS DMS. The migration is taking longer than expected, and the ongoing replication lag is increasing. Which action would MOST likely improve the migration speed?
⚠ Common exam trap
Test-takers frequently assume tuning batch sizes or parallel load settings will fix performance issues, but the question explicitly states the migration is taking longer than expected and replication lag is increasing, which points to an under-provisioned replication instance rather than suboptimal task configuration.
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 DMS replication instance size.
Increasing the replication instance size (Option C) directly addresses the root cause of slow migration and increasing replication lag: insufficient compute or network resources on the DMS instance. A larger instance provides more CPU, memory, and network bandwidth, enabling faster full-load processing and more efficient ongoing replication. This is the most effective action when the instance is resource-constrained, which is common with a 2 TB database.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable parallel load on the DMS task.
Why it's wrong here
Parallel load is for full load, not ongoing replication.
- ✗
Decrease the DMS task's batch size and commit interval.
Why it's wrong here
Smaller batches can increase overhead, not improve speed.
- ✓
Increase the DMS replication instance size.
Why this is correct
More resources improve replication performance.
- ✗
Disable the DMS task's logging to reduce overhead.
Why it's wrong here
Disabling logging is not recommended and may cause data loss.
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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.