- A
Cloud Pub/Sub with a custom connector to MySQL
Why wrong: Requires custom development and maintenance; not a managed solution.
- B
BigQuery Data Transfer Service for MySQL
Why wrong: BigQuery Data Transfer Service does not support MySQL as a source.
- C
Cloud Dataflow with a JDBC source
Why wrong: Dataflow can read from JDBC but requires a custom pipeline and does not handle MySQL replication logs natively.
- D
Cloud Datastream
Datastream is purpose-built for CDC from common databases to BigQuery or GCS.
Question 109 of 1,000
PDE Ingesting and Processing the Data Practice Question
This PDE practice question tests your understanding of ingesting and processing the data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
An organization needs to continuously replicate change data from a MySQL database to BigQuery with sub-minute latency. The database is running on-premises. Which Google Cloud service should they use?
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 Datastream
Datastream is a serverless change data capture (CDC) service that can replicate from MySQL, PostgreSQL, and Oracle to BigQuery or GCS with low latency. Pub/Sub is a messaging service and does not natively connect to MySQL. Dataflow can process streams but requires a CDC connector. BigQuery Data Transfer Service does not support live CDC from on-prem MySQL.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 Pub/Sub with a custom connector to MySQL
Why it's wrong here
Requires custom development and maintenance; not a managed solution.
- ✗
BigQuery Data Transfer Service for MySQL
Why it's wrong here
BigQuery Data Transfer Service does not support MySQL as a source.
- ✗
Cloud Dataflow with a JDBC source
Why it's wrong here
Dataflow can read from JDBC but requires a custom pipeline and does not handle MySQL replication logs natively.
- ✓
Cloud Datastream
Why this is correct
Datastream is purpose-built for CDC from common databases to BigQuery or GCS.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PDE ACL questions on filtering logic and placement.
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Ingesting and Processing the Data — study guide chapter
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FAQ
Questions learners often ask
What does this PDE question test?
Ingesting and Processing the Data — This question tests Ingesting and Processing the Data — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Cloud Datastream — Datastream is a serverless change data capture (CDC) service that can replicate from MySQL, PostgreSQL, and Oracle to BigQuery or GCS with low latency. Pub/Sub is a messaging service and does not natively connect to MySQL. Dataflow can process streams but requires a CDC connector. BigQuery Data Transfer Service does not support live CDC from on-prem MySQL.
What should I do if I get this PDE question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PDE ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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Last reviewed: Jul 4, 2026
This PDE 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 PDE exam.
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