- A
Pub/Sub + Dataflow
Why wrong: This combination is possible but requires building a custom pipeline to handle CDC, increasing operational overhead.
- B
Storage Transfer Service
Why wrong: Storage Transfer Service is for batch file transfers between cloud storage systems, not for real-time CDC from databases.
- C
Transfer Appliance
Why wrong: Transfer Appliance is for offline, petabyte-scale data transfers, not for ongoing CDC streaming.
- D
Datastream
Datastream is purpose-built for serverless CDC from databases to Google Cloud destinations like BigQuery and GCS.
Question 669 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.
A data engineer needs to ingest on-premises Oracle CDC data into BigQuery in near real-time 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 purpose-built for streaming change data capture (CDC) from Oracle and other sources into BigQuery with near-real-time latency and minimal operational overhead. It handles schema propagation, checkpointing, and automatic retries, eliminating the need to manage custom ingestion pipelines.
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.
- ✗
Pub/Sub + Dataflow
Why it's wrong here
This combination is possible but requires building a custom pipeline to handle CDC, increasing operational overhead.
- ✗
Storage Transfer Service
Why it's wrong here
Storage Transfer Service is for batch file transfers between cloud storage systems, not for real-time CDC from databases.
- ✗
Transfer Appliance
Why it's wrong here
Transfer Appliance is for offline, petabyte-scale data transfers, not for ongoing CDC streaming.
- ✓
Datastream
Why this is correct
Datastream is purpose-built for serverless CDC from databases to Google Cloud destinations like BigQuery and GCS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google often tests the distinction between batch migration tools (Storage Transfer Service, Transfer Appliance) and streaming CDC services (Datastream), leading candidates to choose a batch option when the question explicitly requires near-real-time ingestion.
Detailed technical explanation
How to think about this question
Datastream uses Oracle LogMiner or direct redo log access to capture changes without impacting source performance, then streams them into BigQuery via a staging area in Cloud Storage. It automatically handles schema drift and supports backfill for historical data, making it ideal for hybrid cloud architectures where minimal source-side footprint is critical.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
- →
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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Datastream — Datastream is purpose-built for streaming change data capture (CDC) from Oracle and other sources into BigQuery with near-real-time latency and minimal operational overhead. It handles schema propagation, checkpointing, and automatic retries, eliminating the need to manage custom ingestion pipelines.
What should I do if I get this PDE 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.
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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 →
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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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