- A
Use manual scaling instead of automatic scaling
Why wrong: Manual scaling does not automatically keep idle instances; you must set min_idle_instances.
- B
Use Cloud Endpoints for request authentication
Why wrong: Cloud Endpoints adds API management but does not affect instance startup latency.
- C
Set min_idle_instances to a value greater than 0
This ensures that a pool of warm instances is always available, reducing cold start latency.
- D
Increase the memory limit per instance
Why wrong: More memory may not reduce instance startup time; the issue is initial setup, not memory.
Question 528 of 1,000
PCDOE Optimizing service performance Practice Question
This PCDOE practice question tests your understanding of optimizing service performance. 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.
An application running on App Engine standard environment has high instance startup latency, leading to slow first requests. What is the most effective configuration change to reduce cold starts?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 min_idle_instances to a value greater than 0
Setting min_idle_instances to a value greater than 0 ensures that a baseline number of instances are always running and ready to serve requests, eliminating the need to spin up new instances on the first request. This directly reduces cold start latency because the application does not have to wait for instance initialization, which includes loading dependencies and running startup scripts.
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 manual scaling instead of automatic scaling
Why it's wrong here
Manual scaling does not automatically keep idle instances; you must set min_idle_instances.
- ✗
Use Cloud Endpoints for request authentication
Why it's wrong here
Cloud Endpoints adds API management but does not affect instance startup latency.
- ✓
Set min_idle_instances to a value greater than 0
Why this is correct
This ensures that a pool of warm instances is always available, reducing cold start latency.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the memory limit per instance
Why it's wrong here
More memory may not reduce instance startup time; the issue is initial setup, not memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that manual scaling eliminates cold starts, but candidates fail to realize that manual scaling still requires new instances to cold-start if the fixed pool is exhausted or if instances are recycled.
Detailed technical explanation
How to think about this question
Under the hood, App Engine standard environment uses a sandboxed runtime where each instance must load the application code, initialize frameworks, and establish connections (e.g., to Cloud SQL or Datastore) before serving requests. Setting min_idle_instances keeps a pool of warm instances that have already completed this initialization, so the first request bypasses the startup sequence entirely. In a real-world scenario, a production app with spiky traffic might set min_idle_instances to 2-3 to handle sudden bursts without incurring cold start penalties.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
- →
Optimizing service performance — study guide chapter
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FAQ
Questions learners often ask
What does this PCDOE question test?
Optimizing service performance — This question tests Optimizing service performance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set min_idle_instances to a value greater than 0 — Setting min_idle_instances to a value greater than 0 ensures that a baseline number of instances are always running and ready to serve requests, eliminating the need to spin up new instances on the first request. This directly reduces cold start latency because the application does not have to wait for instance initialization, which includes loading dependencies and running startup scripts.
What should I do if I get this PCDOE 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 PCDOE 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 PCDOE exam.
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