Question 336 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.
Which BigQuery feature allows you to write data with exactly-once semantics, high throughput, and the ability to buffer data before making it available for queries?
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
✓
Storage Write API with buffered mode
The Storage Write API with buffered mode (option D) is correct because it provides exactly-once semantics for data ingestion, high throughput via gRPC streaming, and the ability to buffer data in memory before making it available for queries. This mode allows you to commit rows in a stream, ensuring no duplicates, while the buffering stage gives you control over when data becomes visible in BigQuery.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that legacy streaming inserts (option C) provide exactly-once semantics, but they actually offer at-least-once delivery, making the Storage Write API with buffered mode the only correct choice for exactly-once, high-throughput, buffered writes.
Detailed technical explanation
How to think about this question
The Storage Write API uses gRPC and supports both 'pending' and 'committed' modes; in buffered mode, rows are held in a stream buffer until explicitly committed via a commit operation, enabling exactly-once delivery even on retries. Under the hood, the API assigns a unique offset to each row, and the BigQuery storage layer deduplicates based on these offsets, ensuring no duplicate writes. A real-world scenario is ingesting financial transaction logs where duplicates are unacceptable, and you need to batch-commit rows after validation without immediate query visibility.
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
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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: Storage Write API with buffered mode — The Storage Write API with buffered mode (option D) is correct because it provides exactly-once semantics for data ingestion, high throughput via gRPC streaming, and the ability to buffer data in memory before making it available for queries. This mode allows you to commit rows in a stream, ensuring no duplicates, while the buffering stage gives you control over when data becomes visible in BigQuery.
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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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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