- A
Cloud SQL Auth Proxy
Cloud SQL Auth Proxy is the correct source connectivity method for DMS when connecting over the internet. It establishes a secure tunnel to Cloud SQL, enabling migration without exposing the source database to the public internet.
- B
Cloud Interconnect
Why wrong: Cloud Interconnect provides dedicated connectivity, but it is not required for internet-based migrations. DMS supports internet-based migration using Cloud SQL Auth Proxy, not necessarily Cloud Interconnect.
- C
VPC Network Peering to on-premises network via Cloud VPN
Why wrong: VPC Network Peering via Cloud VPN is a valid option for hybrid connectivity, but for internet-based migration over the internet, DMS supports Cloud SQL Auth Proxy as a simpler and secure method.
- D
Direct connection using Oracle Net Services over public IP with SSL
Why wrong: Direct connection using Oracle Net Services over public IP with SSL is not supported by DMS for source connectivity over the internet. DMS uses Cloud SQL Auth Proxy instead to securely connect to the source database.
PCD Database Migration Service (DMS) Practice Question
This PCD practice question tests your understanding of migrate data solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: 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 planning to migrate an on-premises Oracle database to Cloud SQL for PostgreSQL. They want to use Google's Database Migration Service (DMS) for continuous migration with minimal downtime. Which source connectivity method does DMS support for connecting to the Oracle database over the internet?
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
Cloud SQL Auth Proxy
Google's Database Migration Service (DMS) supports Cloud SQL Auth Proxy as the source connectivity method for connecting to an on-premises Oracle database over the internet. Cloud SQL Auth Proxy creates a secure tunnel to Cloud SQL, allowing DMS to connect without exposing the source database to the public internet. This method is specifically designed for secure, internet-based migrations and is the recommended approach for minimal downtime continuous migration.
Key principle: 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.
- ✓
Cloud SQL Auth Proxy
Why this is correct
Cloud SQL Auth Proxy is the correct source connectivity method for DMS when connecting over the internet. It establishes a secure tunnel to Cloud SQL, enabling migration without exposing the source database to the public internet.
Related concept
Database Migration Service (DMS)
- ✗
Cloud Interconnect
Why it's wrong here
Cloud Interconnect provides dedicated connectivity, but it is not required for internet-based migrations. DMS supports internet-based migration using Cloud SQL Auth Proxy, not necessarily Cloud Interconnect.
- ✗
VPC Network Peering to on-premises network via Cloud VPN
Why it's wrong here
VPC Network Peering via Cloud VPN is a valid option for hybrid connectivity, but for internet-based migration over the internet, DMS supports Cloud SQL Auth Proxy as a simpler and secure method.
- ✗
Direct connection using Oracle Net Services over public IP with SSL
Why it's wrong here
Direct connection using Oracle Net Services over public IP with SSL is not supported by DMS for source connectivity over the internet. DMS uses Cloud SQL Auth Proxy instead to securely connect to the source database.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many candidates incorrectly assume that DMS requires direct network connectivity via VPN or interconnect. However, Cloud SQL Auth Proxy provides a simpler, secure internet-based connection that abstracts the network complexity. The key is that Cloud SQL Auth Proxy is not just for client applications; DMS utilizes it for source connectivity as well.
Detailed technical explanation
How to think about this question
Cloud SQL Auth Proxy works by running a lightweight client on the source environment that establishes an outbound connection to the Cloud SQL instance, using IAM-based authentication and TLS 1.2 encryption. This avoids exposing the Cloud SQL instance to the public internet, as the proxy only listens on localhost on the source side. In real-world scenarios, this is critical for compliance with regulations like PCI DSS or HIPAA, where direct database exposure is prohibited.
KKey Concepts to Remember
- Database Migration Service (DMS)
- Cloud SQL Auth Proxy
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
Database Migration Service (DMS)
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.
Review database Migration Service (DMS), then practise related PCD questions on the same topic to reinforce the concept.
- →
Migrate Data Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this PCD question test?
Migrate Data Solutions — This question tests Migrate Data Solutions — Database Migration Service (DMS).
What is the correct answer to this question?
The correct answer is: Cloud SQL Auth Proxy — Google's Database Migration Service (DMS) supports Cloud SQL Auth Proxy as the source connectivity method for connecting to an on-premises Oracle database over the internet. Cloud SQL Auth Proxy creates a secure tunnel to Cloud SQL, allowing DMS to connect without exposing the source database to the public internet. This method is specifically designed for secure, internet-based migrations and is the recommended approach for minimal downtime continuous migration.
What should I do if I get this PCD question wrong?
Review database Migration Service (DMS), then practise related PCD questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Database Migration Service (DMS)
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Last reviewed: Jul 4, 2026
This PCD practice question is part of Courseiva's free Google Cloud 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 PCD exam.
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