- A
Cloud Data Fusion with Oracle plugin
Why wrong: Data Fusion is not serverless CDC; it's a managed ETL service.
- B
Cloud Composer with scheduled jobs
Why wrong: Composer is for workflow orchestration, not real-time CDC.
- C
Datastream
Datastream provides serverless CDC from Oracle to BigQuery.
- D
Dataflow with a Java transformation
Why wrong: Dataflow can process streams but requires custom code; Datastream is serverless and simpler for CDC.
Question 19 of 980
PCD Practice Question: Manage a Solution that Can Span Multiple Database Systems
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. 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 wants to replicate data from an on-premises Oracle database to BigQuery for analytics. They need serverless, near-real-time CDC with minimal operational overhead. Which 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
✓
Datastream
Datastream is a serverless, fully managed change data capture (CDC) and replication service that streams data from Oracle (and other sources) into BigQuery with near-real-time latency. It uses log-based CDC (Oracle Redo Logs) to capture changes without impacting source performance, and it handles schema mapping and data transformation automatically, minimizing operational overhead.
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.
- ✗
Cloud Data Fusion with Oracle plugin
Why it's wrong here
Data Fusion is not serverless CDC; it's a managed ETL service.
- ✗
Cloud Composer with scheduled jobs
Why it's wrong here
Composer is for workflow orchestration, not real-time CDC.
- ✓
Datastream
Why this is correct
Datastream provides serverless CDC from Oracle to BigQuery.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dataflow with a Java transformation
Why it's wrong here
Dataflow can process streams but requires custom code; Datastream is serverless and simpler for CDC.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Datastream with Dataflow, assuming that any streaming CDC must use Dataflow, but Datastream is the purpose-built, serverless service for database-to-BigQuery replication with minimal overhead, while Dataflow is a general-purpose processing engine that requires custom CDC implementation.
Detailed technical explanation
How to think about this question
Datastream leverages Oracle's LogMiner or direct redo log access to capture INSERT, UPDATE, and DELETE operations as they occur, then streams them via a private connectivity configuration (e.g., VPC peering or IP allowlisting) into BigQuery's streaming buffer. Under the hood, it uses a checkpoint mechanism to ensure exactly-once semantics and can handle backfill of historical data alongside ongoing CDC. A real-world scenario where this matters is replicating a high-transaction-volume OLTP Oracle database (e.g., 10k+ transactions/sec) to BigQuery for real-time dashboards, where Datastream's serverless scaling and low-latency streaming avoid the complexity of managing custom Dataflow pipelines or batch schedules.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Datastream — Datastream is a serverless, fully managed change data capture (CDC) and replication service that streams data from Oracle (and other sources) into BigQuery with near-real-time latency. It uses log-based CDC (Oracle Redo Logs) to capture changes without impacting source performance, and it handles schema mapping and data transformation automatically, minimizing operational overhead.
What should I do if I get this PCD 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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