- A
Disable CloudWatch logging for the DMS replication instance.
Why wrong: Disabling logging has minimal impact on replication performance.
- B
Configure multiple parallel load tasks for ongoing replication.
Why wrong: Parallel load is for full load; ongoing replication uses a single task.
- C
Enable batch apply mode in the DMS task.
Why wrong: Batch apply can improve apply speed but may not address capture performance.
- D
Increase the size of the DMS replication instance (e.g., from dms.c5.xlarge to dms.c5.2xlarge).
A larger instance provides more resources to process transactions faster.
Question 1,031 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is migrating a 1 TB SQL Server database to Amazon RDS for SQL Server. They use AWS DMS with full load and ongoing replication. After the full load completes, they observe that the ongoing replication is falling behind and the target database is not consistent. The source database has high transaction volume. What is the most effective way to improve replication performance?
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 (e.g., from dms.c5.xlarge to dms.c5.2xlarge).
Increasing the DMS replication instance size (Option D) provides more CPU and memory resources, which directly addresses the bottleneck caused by high transaction volume on the source. A larger instance can process and apply changes faster, reducing the replication lag and improving consistency. This is the most effective single action because it scales the entire replication pipeline without altering the task configuration.
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.
- ✗
Disable CloudWatch logging for the DMS replication instance.
Why it's wrong here
Disabling logging has minimal impact on replication performance.
- ✗
Configure multiple parallel load tasks for ongoing replication.
Why it's wrong here
Parallel load is for full load; ongoing replication uses a single task.
- ✗
Enable batch apply mode in the DMS task.
Why it's wrong here
Batch apply can improve apply speed but may not address capture performance.
- ✓
Increase the size of the DMS replication instance (e.g., from dms.c5.xlarge to dms.c5.2xlarge).
Why this is correct
A larger instance provides more resources to process transactions faster.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse full-load parallelism (multiple tasks) with CDC performance, or assume that disabling logging or toggling batch apply will fix lag, when the root cause is insufficient instance compute capacity for high-volume transactional workloads.
Detailed technical explanation
How to think about this question
DMS ongoing replication uses a single transaction cache and apply thread per task; when the source transaction rate exceeds the instance's capacity to parse, cache, and commit changes, lag accumulates. Scaling the instance increases available vCPUs and memory, allowing the apply thread to process larger batches and handle higher commit rates. In real-world scenarios, a dms.c5.xlarge can handle approximately 10,000–15,000 transactions per second, while a dms.c5.2xlarge roughly doubles that capacity.
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.
TExam Day Tips
- 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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the size of the DMS replication instance (e.g., from dms.c5.xlarge to dms.c5.2xlarge). — Increasing the DMS replication instance size (Option D) provides more CPU and memory resources, which directly addresses the bottleneck caused by high transaction volume on the source. A larger instance can process and apply changes faster, reducing the replication lag and improving consistency. This is the most effective single action because it scales the entire replication pipeline without altering the task configuration.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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