SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company uses AWS Lambda functions to process events from an SQS queue. The Lambda function is configured with a reserved concurrency of 5. The SQS queue has a high volume of messages, and the Lambda function is experiencing throttling errors. What is the most cost-effective solution to reduce throttling?
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 for the Lambda function.
Increasing the reserved concurrency from 5 to a higher value allows the Lambda function to handle more concurrent invocations, directly reducing throttling errors. Option A is incorrect because each Lambda function has its own concurrency limit; adding more functions does not increase the concurrency of a single function. Option B is incorrect because decreasing reserved concurrency would worsen throttling. Option D is incorrect because increasing the batch size increases the number of messages processed per invocation but does not increase the number of concurrent invocations, so it does not address throttling caused by concurrency limits.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create multiple Lambda functions each processing a subset of the queue.
Why it's wrong here
This is unnecessary and increases complexity.
- ✗
Decrease the reserved concurrency to force the function to process messages more efficiently.
Why it's wrong here
This would increase throttling.
- ✓
Increase the reserved concurrency for the Lambda function.
Why this is correct
This allows more concurrent executions, reducing throttling.
- ✗
Increase the batch size of the SQS event source mapping.
Why it's wrong here
Larger batches may cause function timeouts.
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.