- A
Set the pipeline to use event time for watermarking.
Event time ensures windows based on actual event occurrence time, necessary for correct sliding window semantics.
- B
Use a Sliding window of 1 hour with a 1-minute slide.
This computes the average over the last hour, updated every minute.
- C
Use a Fixed window of 1 minute.
Why wrong: Fixed window does not slide; it would produce non-overlapping windows.
- D
Use stateful processing with a custom timer.
Why wrong: Possible but not necessary; Beam's sliding window is simpler and directly applicable.
- E
Set the pipeline to use processing time for watermarking.
Why wrong: Processing time would not correctly reflect event timestamps, causing inaccurate windows.
Question 672 of 1,000
PDE Ingesting and Processing the Data Practice Question
This PDE practice question tests your understanding of ingesting and processing the data. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is building a real-time anomaly detection pipeline using Dataflow. Events are ingested from Pub/Sub, and the pipeline must compute a sliding window average every minute over a 1-hour window. Which TWO configurations are required for this pipeline? (Choose 2)
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
✓
Set the pipeline to use event time for watermarking.
A sliding window of 1-hour length with a 1-minute slide period fits the requirement (every minute, compute over last hour). Fixed window of 1 minute would compute only per-minute, not sliding. Using stateful processing with timers is an alternative but not standard for sliding windows. Dataflow's default watermark is based on event time; processing time would cause incorrect results. The window type and period are the key.
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.
- ✓
Set the pipeline to use event time for watermarking.
Why this is correct
Event time ensures windows based on actual event occurrence time, necessary for correct sliding window semantics.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Use a Sliding window of 1 hour with a 1-minute slide.
Why this is correct
This computes the average over the last hour, updated every minute.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a Fixed window of 1 minute.
Why it's wrong here
Fixed window does not slide; it would produce non-overlapping windows.
- ✗
Use stateful processing with a custom timer.
Why it's wrong here
Possible but not necessary; Beam's sliding window is simpler and directly applicable.
- ✗
Set the pipeline to use processing time for watermarking.
Why it's wrong here
Processing time would not correctly reflect event timestamps, causing inaccurate windows.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which PDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: Set the pipeline to use event time for watermarking. — A sliding window of 1-hour length with a 1-minute slide period fits the requirement (every minute, compute over last hour). Fixed window of 1 minute would compute only per-minute, not sliding. Using stateful processing with timers is an alternative but not standard for sliding windows. Dataflow's default watermark is based on event time; processing time would cause incorrect results. The window type and period are the key.
What should I do if I get this PDE question wrong?
Identify which PDE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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