- A
Use AWS DMS with a VPN connection to the on-premises database
DMS can migrate online within bandwidth constraints.
- B
Set up AWS Direct Connect and use DMS
Why wrong: Direct Connect provisioning may take more than 5 days.
- C
Use AWS Snowball Edge to transfer data offline
Why wrong: Shipping may exceed the 5-day window.
- D
Export to Amazon S3 and import into Aurora
Why wrong: Aurora PostgreSQL does not support direct S3 import.
Question 567 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 needs to migrate a 2 TB PostgreSQL database from an on-premises data center to Amazon Aurora PostgreSQL. The network bandwidth is limited to 100 Mbps. The migration window is 5 days. Which approach is most cost-effective and likely to succeed?
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
✓
Use AWS DMS with a VPN connection to the on-premises database
Option A is correct because AWS DMS with a VPN connection can handle the migration of 2 TB over 100 Mbps within 5 days. At 100 Mbps, the theoretical maximum transfer is about 1.08 TB per day (100 Mbps * 86400 seconds / 8 bits per byte / 1024^3), so 2 TB would take roughly 1.85 days of continuous transfer, well within the 5-day window. DMS supports ongoing replication to minimize downtime, and a VPN is cost-effective compared to Direct Connect for a one-time migration.
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.
- ✓
Use AWS DMS with a VPN connection to the on-premises database
Why this is correct
DMS can migrate online within bandwidth constraints.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up AWS Direct Connect and use DMS
Why it's wrong here
Direct Connect provisioning may take more than 5 days.
- ✗
Use AWS Snowball Edge to transfer data offline
Why it's wrong here
Shipping may exceed the 5-day window.
- ✗
Export to Amazon S3 and import into Aurora
Why it's wrong here
Aurora PostgreSQL does not support direct S3 import.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overestimate the need for offline transfer (Snowball) or expensive dedicated connections (Direct Connect) when the bandwidth and time window are actually sufficient for an online migration, leading them to ignore the cost-effectiveness of a VPN-based DMS approach.
Detailed technical explanation
How to think about this question
AWS DMS uses Change Data Capture (CDC) via PostgreSQL's logical replication slots (pglogical or native slots) to capture ongoing changes during the full load, minimizing downtime. The 100 Mbps bandwidth translates to a practical throughput of ~11.4 MB/s after TCP/IP overhead, which for 2 TB (2,097,152 MB) yields about 2.1 days of continuous transfer, leaving ample time for CDC and validation. DMS also automatically handles table partitioning, LOBs, and data type conversions, making it the most reliable choice for heterogeneous migrations.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Deployment and Migration — study guide chapter
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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: Use AWS DMS with a VPN connection to the on-premises database — Option A is correct because AWS DMS with a VPN connection can handle the migration of 2 TB over 100 Mbps within 5 days. At 100 Mbps, the theoretical maximum transfer is about 1.08 TB per day (100 Mbps * 86400 seconds / 8 bits per byte / 1024^3), so 2 TB would take roughly 1.85 days of continuous transfer, well within the 5-day window. DMS supports ongoing replication to minimize downtime, and a VPN is cost-effective compared to Direct Connect for a one-time migration.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
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