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.
A team is using Cloud Run for a containerized application. They notice that requests have high latency due to cold starts. Which configuration change would most effectively reduce cold start latency?
Set the min-instances parameter to a value > 0
Correct. Min-instances keeps instances warm.
Enable concurrent requests
Why wrong: Concurrent requests affect throughput, not cold starts.
Increase the function timeout
Why wrong: Timeout does not reduce cold starts.
Reduce the container image size
Why wrong: Reducing image size helps but is less effective than keeping instances warm.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Set the min-instances parameter to a value > 0
Setting the `min-instances` parameter to a value greater than 0 keeps a baseline number of container instances always warm and ready to serve requests. This eliminates the cold start penalty because the runtime environment, including the container and its dependencies, is already initialized and listening for traffic. Cloud Run will scale down to this minimum count, ensuring that new requests are routed to pre-warmed instances rather than triggering a new container startup.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Set the min-instances parameter to a value > 0
Why this is correct
Correct. Min-instances keeps instances warm.
Related concept
Read the scenario before looking for a memorised answer.
Enable concurrent requests
Why it's wrong here
Concurrent requests affect throughput, not cold starts.
Increase the function timeout
Why it's wrong here
Timeout does not reduce cold starts.
Reduce the container image size
Why it's wrong here
Reducing image size helps but is less effective than keeping instances warm.
Common exam traps
The trap here is that candidates often think reducing container image size (Option D) is the most effective solution, but while it reduces startup time, it does not prevent cold starts entirely, whereas min-instances eliminates them for the baseline count.
Detailed technical explanation
Under the hood, Cloud Run uses Knative serving to manage container lifecycles. When `min-instances` is set, the Knative autoscaler maintains a specified number of 'activator' routes and keeps the container pods in a ready state, bypassing the full startup sequence (image pull, filesystem mount, entrypoint execution). In a real-world scenario, a financial trading dashboard that must respond within milliseconds can use min-instances to guarantee sub-100ms response times even during traffic troughs, while still benefiting from scale-to-zero for cost savings during extended idle periods.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Optimizing service performance — This question tests Optimizing service performance — Read the scenario before looking for a memorised answer..
The correct answer is: Set the min-instances parameter to a value > 0 — Setting the `min-instances` parameter to a value greater than 0 keeps a baseline number of container instances always warm and ready to serve requests. This eliminates the cold start penalty because the runtime environment, including the container and its dependencies, is already initialized and listening for traffic. Cloud Run will scale down to this minimum count, ensuring that new requests are routed to pre-warmed instances rather than triggering a new container startup.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 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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