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Question 488 of 1,730

Management and Operations →hardMultiple ChoiceObjective-mapped

Oracle to RDS Migration with Minimal Downtime

This DBS-C01 practice question tests your understanding of management and operations. 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 an on-premises Oracle database to Amazon RDS for Oracle. The database size is 2 TB and the network bandwidth is limited. The company needs to minimize downtime during migration. Which AWS service should be used?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
Oracle Data Pump export and import
Why wrong: This requires downtime for the export.
B
AWS Schema Conversion Tool (SCT)
Why wrong: SCT is for schema conversion, not continuous data migration.
C
AWS Database Migration Service (DMS)
DMS can migrate live data with minimal downtime.
D
AWS Snowball Edge
Why wrong: Snowball is for offline transfer, which introduces downtime.

Full breakdown with real-world context →

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

✓

AWS Database Migration Service (DMS)

AWS DMS is the correct choice because it supports ongoing replication from Oracle to Amazon RDS for Oracle, allowing you to perform a live migration with minimal downtime. With a 2 TB database and limited bandwidth, DMS can use Change Data Capture (CDC) to keep the target synchronized while the initial full load runs, then switch over with only a brief outage. This makes it ideal for minimizing downtime compared to offline methods.

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.

✗
Oracle Data Pump export and import
Why it's wrong here
This requires downtime for the export.
✗
AWS Schema Conversion Tool (SCT)
Why it's wrong here
SCT is for schema conversion, not continuous data migration.
✓
AWS Database Migration Service (DMS)
Why this is correct
DMS can migrate live data with minimal downtime.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS Snowball Edge
Why it's wrong here
Snowball is for offline transfer, which introduces downtime.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often choose AWS Snowball Edge for any large database with limited bandwidth, overlooking that DMS with CDC can achieve minimal downtime even for multi-terabyte databases, whereas Snowball introduces significant operational delay and is better suited for petabyte-scale or disconnected environments.

Detailed technical explanation

How to think about this question

DMS uses a replication instance to connect to the source Oracle database via Oracle LogMiner or binary reader to capture changes from redo logs, enabling near-real-time CDC. During the full load phase, DMS parallelizes table loads using multiple threads, but with limited bandwidth, you can throttle the task to avoid saturating the link. A real-world scenario is migrating a 2 TB OLTP database over a 50 Mbps link: DMS can run the full load over several days while CDC catches up, then a final cutover takes minutes.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DBS-C01 question test?

Management and Operations — This question tests Management and Operations — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: AWS Database Migration Service (DMS) — AWS DMS is the correct choice because it supports ongoing replication from Oracle to Amazon RDS for Oracle, allowing you to perform a live migration with minimal downtime. With a 2 TB database and limited bandwidth, DMS can use Change Data Capture (CDC) to keep the target synchronized while the initial full load runs, then switch over with only a brief outage. This makes it ideal for minimizing downtime compared to offline methods.

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.

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

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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Same concept, more angles

1 more ways this is tested on DBS-C01

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 is migrating an on-premises Oracle database to Amazon RDS for Oracle. During the migration, they need to ensure minimal downtime. Which AWS service should be used for the migration?

easy

✓ A.AWS Database Migration Service
B.AWS DataSync
C.Amazon S3 Transfer Acceleration
D.AWS Server Migration Service

Why A: AWS Database Migration Service (DMS) is the correct choice because it is specifically designed for migrating databases to AWS with minimal downtime. DMS supports homogeneous migrations (e.g., Oracle to Oracle) and heterogeneous migrations (e.g., Oracle to Amazon Aurora), and it can perform continuous replication using change data capture (CDC) to keep the source and target databases synchronized during the migration, allowing you to cut over with only a brief pause.

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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.