PDE Ingesting and Processing the Data Practice Question
You need to ingest streaming data from a custom application into BigQuery with exactly-once semantics and low latency. The data volume is up to 10 MB/s. Which TWO services should you combine?
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
✓
Pub/Sub
Pub/Sub provides reliable, low-latency message ingestion, and Dataflow can read from Pub/Sub and write to BigQuery using the Storage Write API, which supports exactly-once semantics. The Storage Write API with committed mode ensures exactly-once delivery.
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
Why this is correct
Pub/Sub is the recommended message ingestion service for streaming data.
- ✗
Cloud Functions
Why it's wrong here
Cloud Functions are not ideal for high-throughput streaming and do not provide exactly-once to BigQuery easily.
- ✗
BigQuery legacy streaming inserts
Why it's wrong here
Legacy streaming inserts offer at-least-once semantics, not exactly-once.
- ✓
Dataflow with Storage Write API
Why this is correct
Dataflow with Storage Write API provides exactly-once streaming inserts into BigQuery.
- ✗
Datastream
Why it's wrong here
Datastream is for CDC from databases, not custom applications.
Go deeper
Related to this question
About these practice questions
Courseiva writes every PDE question from scratch — 890 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
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.