- A
Use Cloud Functions to receive events and call the BigQuery REST API
Why wrong: Cloud Functions would call legacy streaming inserts or Storage Write API, but the pattern adds latency and complexity; not the best choice.
- B
Use BigQuery Storage Write API in committed mode
Committed mode provides exactly-once semantics and low latency (sub-second).
- C
Use BigQuery legacy streaming inserts directly from the application
Why wrong: Legacy streaming inserts provide at-least-once delivery, not exactly-once.
- D
Use Apache Kafka on Dataproc and write to BigQuery via the BigQuery Kafka connector
Why wrong: Kafka connector provides at-least-once delivery; exactly-once would require additional handling.
- E
Stream data to Pub/Sub, then use Dataflow to write to BigQuery with exactly-once guarantees
Dataflow with the Storage Write API can provide exactly-once delivery; Pub/Sub is a scalable ingestion layer.
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 company needs to stream real-time user activity data from their application into BigQuery for immediate dashboarding. They want to minimize latency (under 5 seconds) and ensure exactly-once delivery. Which TWO options should they consider? (Choose 2)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Use BigQuery Storage Write API in committed mode
Option B is correct because the BigQuery Storage Write API in committed mode provides exactly-once delivery semantics and low-latency streaming (typically under 5 seconds) directly into BigQuery. It is designed for real-time ingestion with strong consistency guarantees, making it ideal for immediate dashboarding.
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.
- ✗
Use Cloud Functions to receive events and call the BigQuery REST API
Why it's wrong here
Cloud Functions would call legacy streaming inserts or Storage Write API, but the pattern adds latency and complexity; not the best choice.
- ✓
Use BigQuery Storage Write API in committed mode
Why this is correct
Committed mode provides exactly-once semantics and low latency (sub-second).
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use BigQuery legacy streaming inserts directly from the application
Why it's wrong here
Legacy streaming inserts provide at-least-once delivery, not exactly-once.
- ✗
Use Apache Kafka on Dataproc and write to BigQuery via the BigQuery Kafka connector
Why it's wrong here
Kafka connector provides at-least-once delivery; exactly-once would require additional handling.
- ✓
Stream data to Pub/Sub, then use Dataflow to write to BigQuery with exactly-once guarantees
Why this is correct
Dataflow with the Storage Write API can provide exactly-once delivery; Pub/Sub is a scalable ingestion layer.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between legacy streaming inserts (at-least-once) and the Storage Write API (exactly-once), and candidates mistakenly choose legacy inserts because they are simpler to implement, ignoring the exactly-once requirement.
Detailed technical explanation
How to think about this question
The BigQuery Storage Write API uses a gRPC-based protocol that supports row-level acknowledgments and offset tracking, enabling exactly-once semantics when used in committed mode. Under the hood, it writes directly to the BigQuery storage layer, bypassing the streaming buffer used by legacy inserts, which reduces visibility latency to seconds. In real-world scenarios, this API is critical for financial or fraud-detection pipelines where duplicate events would cause incorrect aggregations.
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.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use BigQuery Storage Write API in committed mode — Option B is correct because the BigQuery Storage Write API in committed mode provides exactly-once delivery semantics and low-latency streaming (typically under 5 seconds) directly into BigQuery. It is designed for real-time ingestion with strong consistency guarantees, making it ideal for immediate dashboarding.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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