The Serverless Spotlight

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The Serverless Spotlight
Using Reserved Vs Unreserved Concurrency in AWS Lambda

Using Reserved Vs Unreserved Concurrency in AWS Lambda

The pros and cons of using reserved and unreserved concurrency in your Lambda functions

Uriel Bitton's avatar
Uriel Bitton
Jun 26, 2025
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The Serverless Spotlight
The Serverless Spotlight
Using Reserved Vs Unreserved Concurrency in AWS Lambda
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AWS Lambda has a powerful feature for configuring the scalability of your serverless functions.

It offers two types of concurrency provisioning for your functions:

  1. Reserved concurrency

  2. Unreserved concurrency

Understanding the difference between both and how to provision them correctly is key to scalable serverless functions.

What is Concurrency?

Concurrency i…

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