- A
AWS DataSync
Why wrong: DataSync is for file and object storage migration, not databases.
- B
AWS DMS with CDC
AWS DMS with CDC enables continuous replication and minimal downtime.
- C
AWS S3 Transfer Acceleration
Why wrong: S3 Transfer Acceleration speeds up uploads to S3, not for database replication.
- D
AWS Snowball Edge
Why wrong: Snowball Edge is for large offline data transfer, not real-time database replication.
Question 667 of 997
CV0-004 Deployment Practice Question
This CV0-004 practice question tests your understanding of deployment. 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 large Oracle database (2 TB) from on-premises to AWS RDS for Oracle. They require minimal downtime and need to keep the source database running during migration. Which AWS service should they use to achieve continuous replication?
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 DMS with CDC
AWS DMS with Change Data Capture (CDC) is the correct choice because it enables continuous replication of ongoing changes from the source Oracle database to the target RDS for Oracle instance, allowing the source to remain fully operational during migration. CDC captures incremental changes (inserts, updates, deletes) from the source's redo logs, minimizing downtime to a brief cutover window. This meets the requirement of a 2 TB database with minimal downtime while keeping the source running.
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.
- ✗
AWS DataSync
Why it's wrong here
DataSync is for file and object storage migration, not databases.
- ✓
AWS DMS with CDC
Why this is correct
AWS DMS with CDC enables continuous replication and minimal downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS S3 Transfer Acceleration
Why it's wrong here
S3 Transfer Acceleration speeds up uploads to S3, not for database replication.
- ✗
AWS Snowball Edge
Why it's wrong here
Snowball Edge is for large offline data transfer, not real-time database replication.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS DataSync or S3 Transfer Acceleration as suitable for database replication, but they lack CDC capabilities and are designed for file or object transfers, not transactional database synchronization.
Detailed technical explanation
How to think about this question
AWS DMS CDC works by reading the Oracle redo logs (using LogMiner or binary reader) to capture changes in near real-time, applying them to the target RDS instance with transactional consistency. For large databases like 2 TB, a full load is performed first, then CDC catches up and maintains synchronization until cutover. A common subtlety is that the source database must have supplemental logging enabled (e.g., supplemental log data primary key) to ensure all changes are captured correctly.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS DMS with CDC — AWS DMS with Change Data Capture (CDC) is the correct choice because it enables continuous replication of ongoing changes from the source Oracle database to the target RDS for Oracle instance, allowing the source to remain fully operational during migration. CDC captures incremental changes (inserts, updates, deletes) from the source's redo logs, minimizing downtime to a brief cutover window. This meets the requirement of a 2 TB database with minimal downtime while keeping the source running.
What should I do if I get this CV0-004 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
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.
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