- A
Use BCP to export the LOB table to flat files and then import to RDS.
Why wrong: Data transfer over 50 Mbps may be too slow.
- B
Use SQL Server native backup and restore to RDS.
Why wrong: Backup file transfer over 50 Mbps may exceed the time window.
- C
Use AWS DMS with compression enabled.
DMS supports compression to reduce data transfer time.
- D
Create a read replica of the on-premises database and promote it.
Why wrong: Read replicas are not supported for on-premises databases.
Question 626 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 is migrating a 1 TB SQL Server database from on-premises to Amazon RDS for SQL Server. The database has a large table with a LOB column. The network bandwidth between the on-premises data center and AWS is limited to 50 Mbps. The migration must be completed within a week. Which approach should the company use?
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 compression enabled.
AWS DMS with compression enabled is the correct approach because it can migrate the 1 TB database within the limited 50 Mbps bandwidth by compressing data during transfer, reducing the total data volume. DMS supports ongoing replication and handles LOB columns efficiently, making it suitable for a time-constrained migration. The 50 Mbps link can transfer approximately 1.5 TB in a week (50 Mbps * 604,800 seconds / 8 = ~3.78 TB raw capacity), but compression and overhead make DMS the most reliable choice for this scenario.
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 BCP to export the LOB table to flat files and then import to RDS.
Why it's wrong here
Data transfer over 50 Mbps may be too slow.
- ✗
Use SQL Server native backup and restore to RDS.
Why it's wrong here
Backup file transfer over 50 Mbps may exceed the time window.
- ✓
Use AWS DMS with compression enabled.
Why this is correct
DMS supports compression to reduce data transfer time.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a read replica of the on-premises database and promote it.
Why it's wrong here
Read replicas are not supported for on-premises databases.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume native backup and restore is universally supported for RDS migrations, but RDS for SQL Server restricts this to specific versions and requires the backup file to be uploaded to S3 first, which still faces bandwidth limitations without compression.
Detailed technical explanation
How to think about this question
AWS DMS uses a change data capture (CDC) mechanism to migrate data with minimal downtime, and compression is applied at the transport layer (gzip) to reduce bandwidth usage. For LOB columns, DMS can handle them in full LOB mode or limited LOB mode, but compression significantly reduces the transfer size, especially for large LOB data. In real-world scenarios, DMS can also parallelize table loads and use task settings to optimize performance, making it ideal for large databases under bandwidth constraints.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
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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 compression enabled. — AWS DMS with compression enabled is the correct approach because it can migrate the 1 TB database within the limited 50 Mbps bandwidth by compressing data during transfer, reducing the total data volume. DMS supports ongoing replication and handles LOB columns efficiently, making it suitable for a time-constrained migration. The 50 Mbps link can transfer approximately 1.5 TB in a week (50 Mbps * 604,800 seconds / 8 = ~3.78 TB raw capacity), but compression and overhead make DMS the most reliable choice for this scenario.
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.
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Last reviewed: Jul 4, 2026
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