- A
Datastream
Correct. Datastream captures changes from Oracle in near real-time.
- B
Cloud Pub/Sub
Why wrong: Incorrect. Pub/Sub is optional; it can buffer events but is not required for the core functionality.
- C
Dataflow
Correct. Dataflow handles complex transformations and loads data into BigQuery.
- D
Cloud Scheduler
Why wrong: Incorrect. Cloud Scheduler is for cron jobs, not for real-time data sync.
- E
Cloud Functions
Why wrong: Incorrect. Cloud Functions can process events but are not designed for complex, stateful transformations.
Question 654 of 999
PCD Datastream Practice Question
This PCD practice question tests your understanding of manage a solution that can span multiple database systems. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: datastream. 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 needs to synchronise data from an on-premises Oracle database to BigQuery in near real-time. They also need to perform complex transformations on the data before loading into BigQuery. Which two services should they use together? (Choose two.)
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
✓
Datastream
Datastream provides serverless change data capture (CDC) from Oracle databases, enabling near real-time synchronization. Dataflow can consume Datastream output (directly or via Pub/Sub) and perform complex transformations using Apache Beam before writing to BigQuery. Cloud Pub/Sub is not mandatory; Datastream can stream directly to BigQuery or to Dataflow. The correct combination for near real-time sync with complex transformations is Datastream and Dataflow.
Key principle: Datastream
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Datastream
Why this is correct
Correct. Datastream captures changes from Oracle in near real-time.
Related concept
Datastream
- ✗
Cloud Pub/Sub
Why it's wrong here
Incorrect. Pub/Sub is optional; it can buffer events but is not required for the core functionality.
- ✓
Dataflow
Why this is correct
Correct. Dataflow handles complex transformations and loads data into BigQuery.
Related concept
Datastream
- ✗
Cloud Scheduler
Why it's wrong here
Incorrect. Cloud Scheduler is for cron jobs, not for real-time data sync.
- ✗
Cloud Functions
Why it's wrong here
Incorrect. Cloud Functions can process events but are not designed for complex, stateful transformations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common mistake is thinking Cloud Pub/Sub is required in the pipeline, but Datastream can stream directly to Dataflow or BigQuery. The pair Datastream + Dataflow is sufficient.
Detailed technical explanation
How to think about this question
Datastream uses Oracle LogMiner or direct redo log access to capture row-level changes with minimal latency, outputting to Cloud Storage or Pub/Sub. Dataflow can read from Pub/Sub (or directly from Datastream's output) and apply stateful transformations like windowing and sessionization, ensuring exactly-once semantics for BigQuery writes via the BigQuery I/O connector.
KKey Concepts to Remember
- Datastream
- Dataflow
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
Datastream
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. Datastream 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 datastream, then practise related PCD questions on the same topic to reinforce the concept.
- →
Manage a Solution that Can Span Multiple Database Systems — study guide chapter
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FAQ
Questions learners often ask
What does this PCD question test?
Manage a Solution that Can Span Multiple Database Systems — This question tests Manage a Solution that Can Span Multiple Database Systems — Datastream.
What is the correct answer to this question?
The correct answer is: Datastream — Datastream provides serverless change data capture (CDC) from Oracle databases, enabling near real-time synchronization. Dataflow can consume Datastream output (directly or via Pub/Sub) and perform complex transformations using Apache Beam before writing to BigQuery. Cloud Pub/Sub is not mandatory; Datastream can stream directly to BigQuery or to Dataflow. The correct combination for near real-time sync with complex transformations is Datastream and Dataflow.
What should I do if I get this PCD question wrong?
Review datastream, then practise related PCD questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Datastream
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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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