The answer is to use AWS DMS with ongoing replication, as this approach enables minimal downtime database migration by continuously synchronizing changes from the on-premises SQL Server to the target Amazon RDS for SQL Server until the final cutover. AWS DMS captures ongoing transactions from the source using change data capture (CDC), allowing the target to remain nearly in sync, so the actual downtime window is reduced to just the seconds needed to redirect traffic. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding of migration strategies under strict uptime requirements, often contrasting DMS with native backup/restore (which incurs full downtime during restore) or offline methods like Snowball. A common trap is choosing a simpler but disruptive option because it seems familiar, so remember that “ongoing replication” is the key phrase for near-zero downtime. Memory tip: think “DMS syncs, downtime shrinks.”
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 wants to migrate a 500 GB SQL Server database to Amazon RDS for SQL Server with the least amount of downtime. The on-premises network has a 1 Gbps connection to AWS. Which approach should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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 ongoing replication from on-premises to RDS
Option B is correct because AWS DMS with ongoing replication allows for minimal downtime by keeping the target in sync until cutover. Option A is wrong because native backup/restore requires downtime during the restore. Option C is wrong because S3 is not a direct migration path. Option D is wrong because Snowball requires shipping time and is not minimal downtime.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 ongoing replication from on-premises to RDS
Why this is correct
DMS with CDC minimizes downtime by synchronizing changes until cutover.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS Snowball to transfer the database backup, then restore to RDS
RDS does not support direct import from .bak files via S3 without a native restore.
✗
Use native SQL Server backup to S3, then restore to RDS
Why it's wrong here
This method requires downtime during backup and restore, and does not support ongoing replication.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS DMS with ongoing replication from on-premises to RDS — Option B is correct because AWS DMS with ongoing replication allows for minimal downtime by keeping the target in sync until cutover. Option A is wrong because native backup/restore requires downtime during the restore. Option C is wrong because S3 is not a direct migration path. Option D is wrong because Snowball requires shipping time and is not minimal downtime.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to migrate a 200 GB SQL Server database to Amazon RDS for SQL Server with minimal downtime. The database is used by a critical application. Which service should be used for the migration?
easy
A.AWS Schema Conversion Tool (SCT).
✓ B.AWS Database Migration Service (DMS).
C.SQL Server Import and Export Wizard.
D.SQL Server Management Studio (SSMS) backup and restore.
Why B: Option A is correct because AWS DMS supports SQL Server as both source and target with ongoing replication. Option B is wrong because SCT is only for schema conversion. Option C is wrong because it's command-line tool for exporting/importing, not continuous replication. Option D is wrong because it's a backup/restore tool.
Variation 2. A company is migrating a 500 GB Oracle database to Amazon RDS for Oracle. The migration must complete within a 4-hour downtime window. The network bandwidth is 1 Gbps. Which migration approach minimizes the migration time?
medium
A.Use AWS Schema Conversion Tool (SCT) to convert the schema, then use AWS DMS for data migration.
B.Use Oracle Data Pump to export and import the database.
✓ C.Use AWS DMS to perform a full load of the database to RDS.
D.Use AWS DataSync to copy the database files to Amazon S3, then restore to RDS.
Why C: Option D is correct because AWS DMS can perform a full load plus ongoing replication, but given the bandwidth and data size, using a direct connection (DX) or SCT is not faster. However, the best approach is to use DMS with full load only if replication is not needed; DMS can load data faster than native export/import. Option A is wrong because native export/import is slower and more manual. Option B is wrong because SCT is for schema conversion only. Option C is wrong because DataSync is for files, not databases.
Variation 3. A company is migrating a 2 TB on-premises Oracle database to Amazon RDS for Oracle. The migration must have minimal downtime and support ongoing replication. Which AWS service should be used to accomplish this?
medium
A.AWS Schema Conversion Tool (AWS SCT)
B.AWS DataSync
C.AWS Glue
✓ D.AWS Database Migration Service (AWS DMS)
Why D: AWS DMS is the correct choice because it supports homogeneous migrations (Oracle to Oracle) with minimal downtime through ongoing replication using change data capture (CDC). It can handle a 2 TB database by using a large enough replication instance and enabling task logging for validation, ensuring data consistency during the migration.
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Question Discussion
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