Lambda pricing model in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are the two main factors that determine AWS Lambda pricing?

AWS Lambda pricing is mainly based on the number of requests and the duration of code execution measured in GB-seconds.

beginner

How does AWS Lambda measure the duration for billing?

Duration is measured from the time your code begins executing until it returns or otherwise terminates, rounded up to the nearest 1 millisecond.

intermediate

What is a GB-second in AWS Lambda pricing?

A GB-second is the amount of memory allocated to your function multiplied by the execution time in seconds. For example, 1 GB of memory running for 1 second equals 1 GB-second.

beginner

Does AWS Lambda charge for idle time when your function is not running?

No, AWS Lambda only charges for the actual compute time your function runs, not for idle time.

beginner

What is the AWS Lambda free tier offer?

AWS Lambda offers 1 million free requests and 400,000 GB-seconds of compute time per month at no charge.

Which of the following does NOT affect AWS Lambda pricing?

A Number of concurrent users accessing your website

B Execution duration

C Amount of memory allocated

D Number of requests

AWS Lambda pricing depends on requests, execution duration, and memory allocated, not on website user count.

How is the execution duration rounded for billing in AWS Lambda?

A To the nearest second

B To the nearest 100 milliseconds

C To the nearest 1 millisecond

D To the nearest minute

AWS Lambda rounds execution duration up to the nearest 1 millisecond for billing.

What does 1 GB-second represent in AWS Lambda pricing?

A 1 GB of storage used for 1 second

B 1 GB of CPU usage for 1 second

C 1 GB of network bandwidth used for 1 second

D 1 GB of memory used for 1 second

1 GB-second means your function used 1 GB of memory for 1 second of execution time.

What is included in the AWS Lambda free tier each month?

A 500,000 requests and 200,000 GB-seconds

B 1 million requests and 400,000 GB-seconds

C Unlimited requests and 100,000 GB-seconds

D 1 million requests and unlimited GB-seconds

The free tier includes 1 million requests and 400,000 GB-seconds of compute time monthly.

Does AWS Lambda charge for the time your function is waiting (idle) between executions?

A No, only for actual execution time

B Only during peak hours

C Yes, always

D Only if memory is above 1 GB

AWS Lambda charges only for the actual time your function runs, not for idle waiting time.

Explain how AWS Lambda pricing works including the main factors that affect cost.

Think about what AWS counts and charges you for when your function runs.

Describe what a GB-second means in the context of AWS Lambda and why it matters for pricing.

Consider how memory and time combine to form the billing metric.