- A
Increase the connection pool size to 200 and enable connection multiplexing
Why wrong: Increasing connection pool size to 200 and enabling connection multiplexing may reduce connection overhead but does not address the high network latency caused by the Direct Connect link to the on-premises database. It could even increase contention and not improve performance.
- B
Deploy an Amazon RDS for MySQL read replica in the same Region and direct read traffic to it
Why wrong: A read replica requires an existing RDS primary instance. Since the database is still on-premises, an RDS read replica cannot be created to replicate from on-premises. This option is not feasible during the testing phase.
- C
Use AWS Database Migration Service to set up ongoing replication from on-premises to RDS
Using DMS with ongoing replication creates an RDS instance in the VPC that stays synchronized with the on-premises database. The application can then be pointed to this local RDS instance, drastically reducing latency. This is the most effective solution with minimal application changes.
- D
Enable Multi-AZ on the RDS instance
Why wrong: Multi-AZ provides high availability for an RDS instance but does not reduce read latency. Additionally, no RDS instance exists yet, so this option is not applicable.
SAP-C02 AWS Database Migration Service (DMS) Practice Question
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. A key principle to apply: aWS Database Migration Service (DMS). 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 legacy on-premises application to AWS. The application consists of a web server, an application server, and a MySQL database. The company has already migrated the web and application servers to EC2 instances in a VPC. The database is still on-premises. The application currently connects to the database using a JDBC connection string with the on-premises IP address. The company wants to minimize changes to the application code. The network team has established an AWS Direct Connect connection between the on-premises data center and the VPC. The security team requires that traffic between the application and the database be encrypted in transit. The database is not publicly accessible. The migration plan includes moving the database to Amazon RDS for MySQL in the same VPC after the initial cutover. During the migration testing phase, the application team reports that the application can connect to the on-premises database but performance is slower than expected. CloudWatch metrics show high latency on the database connections. The application uses a connection pool with 100 connections. Which solution should the solutions architect recommend to improve performance while minimizing application code changes?
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.
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 Database Migration Service to set up ongoing replication from on-premises to RDS
Option C is correct because AWS Database Migration Service (DMS) with ongoing replication can continuously replicate data from the on-premises MySQL database to an Amazon RDS for MySQL instance in the same VPC. This allows the application to connect to the local RDS instance, significantly reducing latency compared to the Direct Connect link. To minimize code changes, the application's JDBC connection string can be updated to point to the RDS endpoint, or a DNS CNAME can be used to abstract the change. Option A (increasing connection pool size) does not reduce network latency and may worsen performance. Option B (read replica) is not feasible because an RDS read replica can only replicate from an RDS primary, not from an on-premises database. Option D (Multi-AZ) is not applicable until the database is on AWS and does not improve latency.
Key principle: AWS Database Migration Service (DMS)
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the connection pool size to 200 and enable connection multiplexing
Why it's wrong here
Increasing connection pool size to 200 and enabling connection multiplexing may reduce connection overhead but does not address the high network latency caused by the Direct Connect link to the on-premises database. It could even increase contention and not improve performance.
- ✗
Deploy an Amazon RDS for MySQL read replica in the same Region and direct read traffic to it
Why it's wrong here
A read replica requires an existing RDS primary instance. Since the database is still on-premises, an RDS read replica cannot be created to replicate from on-premises. This option is not feasible during the testing phase.
- ✓
Use AWS Database Migration Service to set up ongoing replication from on-premises to RDS
Why this is correct
Using DMS with ongoing replication creates an RDS instance in the VPC that stays synchronized with the on-premises database. The application can then be pointed to this local RDS instance, drastically reducing latency. This is the most effective solution with minimal application changes.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
AWS Database Migration Service (DMS)
- ✗
Enable Multi-AZ on the RDS instance
Why it's wrong here
Multi-AZ provides high availability for an RDS instance but does not reduce read latency. Additionally, no RDS instance exists yet, so this option is not applicable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may incorrectly choose option B (read replica) thinking it can replicate from on-premises, but RDS read replicas only work with an RDS source. The correct approach is to use DMS to replicate the on-premises database to an RDS instance in the cloud.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- AWS Database Migration Service (DMS)
- Ongoing Replication
- Connection Pooling
- Direct Connect
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
AWS Database Migration Service (DMS)
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
What to study next
Got this wrong? Here's your next step.
Review aWS Database Migration Service (DMS), then practise related SAP-C02 questions on the same topic to reinforce the concept.
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Accelerate Workload Migration and Modernization — study guide chapter
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Accelerate Workload Migration and Modernization practice questions
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — AWS Database Migration Service (DMS).
What is the correct answer to this question?
The correct answer is: Use AWS Database Migration Service to set up ongoing replication from on-premises to RDS — Option C is correct because AWS Database Migration Service (DMS) with ongoing replication can continuously replicate data from the on-premises MySQL database to an Amazon RDS for MySQL instance in the same VPC. This allows the application to connect to the local RDS instance, significantly reducing latency compared to the Direct Connect link. To minimize code changes, the application's JDBC connection string can be updated to point to the RDS endpoint, or a DNS CNAME can be used to abstract the change. Option A (increasing connection pool size) does not reduce network latency and may worsen performance. Option B (read replica) is not feasible because an RDS read replica can only replicate from an RDS primary, not from an on-premises database. Option D (Multi-AZ) is not applicable until the database is on AWS and does not improve latency.
What should I do if I get this SAP-C02 question wrong?
Review aWS Database Migration Service (DMS), then practise related SAP-C02 questions on the same topic to reinforce the concept.
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?
AWS Database Migration Service (DMS)
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Last reviewed: Jun 20, 2026
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