PDE Ingesting and Processing the Data Practice Question
An organization wants to ingest on-premises Oracle database changes into BigQuery for real-time analytics with minimal latency. The Oracle database is version 19c and has a high transactional volume. Which Google Cloud service should they use?
⚠ Common exam trap
Candidates often incorrectly select Pub/Sub or Dataflow as generic streaming solutions, but Datastream is the only Google Cloud service that natively supports Oracle CDC without additional infrastructure.
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 the correct service because it is purpose-built for real-time, serverless change data capture (CDC) from Oracle databases (including 19c) to BigQuery. It uses LogMiner to read redo logs with minimal overhead, supporting high transactional volumes and sub-second latency without requiring custom code or manual schema management.
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
Datastream supports real-time CDC from Oracle to BigQuery and GCS.
- ✗
Pub/Sub
Why it's wrong here
Pub/Sub is a messaging service but does not natively connect to Oracle for CDC without additional tooling.
- ✗
Dataflow
Why it's wrong here
Dataflow can process streams but requires a separate source connector for Oracle CDC.
- ✗
Storage Transfer Service
Why it's wrong here
Storage Transfer Service is for batch transfers of files between cloud and on-premises, not for real-time CDC.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.