SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company uses AWS Lambda to process events from an SQS queue. The Lambda function has a reserved concurrency of 5. During peak hours, messages are being backed up in the queue. The function's duration is well within the 15-minute limit. What is the fastest way to increase throughput?
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
✓
Increase the reserved concurrency to 20.
Increasing the reserved concurrency to 20 allows more Lambda functions to run simultaneously, enabling more messages to be processed in parallel. This is the fastest way to increase throughput because it directly increases the number of concurrent executions handling messages from the SQS queue. Option A is incorrect because Lambda does not have a configurable maximum thread count. Option C is incorrect because the SQS batch size is limited to a maximum of 10, not 100. Option D is incorrect because creating additional queues would require significant application changes and does not directly increase the processing capacity of the existing Lambda function.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the function's maximum thread count.
Why it's wrong here
Lambda does not expose thread count configuration.
- ✓
Increase the reserved concurrency to 20.
Why this is correct
More concurrency allows more messages to be processed in parallel.
- ✗
Create additional SQS queues and distribute messages.
Why it's wrong here
This adds complexity and requires code changes; not the fastest fix.
- ✗
Increase the SQS batch size to 100.
Why it's wrong here
SQS batch size max is 10 for Lambda.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-C02 practice question is part of Courseiva's free Amazon Web Services 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 SAP-C02 exam.