Serverless

Question 1

Are Lambda Limits Global?

Answer 1

No, they are per region

Question 2

What is the Lambda Memory Allocation?

Answer 2

Between 128MB and 10GB, made in increments of 1MB

Question 3

What is the max runtime for a Lambda?

Answer 3

900 seconds (15 minutes)

Question 4

How much space can the Lambda env variables take up?

Answer 4

4KB

Question 5

How many concurrent execution can be made?

Answer 5

1000 but can be increased

Question 6

When deploying the Lambda, how big can the zip file be?

Answer 6

50MB

Question 7

How big can the deployment code and dependencies be uncompressed?

Answer 7

250MB

Question 8

Why would you use Lambda Edge?

Answer 8

When you use lambda with Cloudfront and need to modify the Cloudfront response before returning to the client

Question 9

What are the 2 modes available for Read/Write Capacity in DynamoDB?

Answer 9

• Provisioned Mode (Default)

- On-Demand

Question 10

What are 4 features of Provisioned Mode for DynamoDB?

Answer 10

• You specify the # of reads/writes per second
• You need to plan capacity in advance
• You pay for provisioned RCU and WCU
• You can add autoscaling for RCU and WCU

Question 11

What are 4 features of On-Demand mode for DynamoDB?

Answer 11

• Reads/Writes automatically scale with your workload
• No Capacity Planning needed
• Its more expensive as you pay for what you use
• Great for unpredictable workloads

Question 12

What is DAX?

Answer 12

DynamoDB Accelerator

Question 13

What does DAX do?

Answer 13

It helps solve read congestion by caching data

Question 14

What are DynamoDB Streams?

Answer 14

They are an ordered stream of changes in a table

Question 15

How long can data stay in a DynamoDB Stream?

Answer 15

Up to 24 hours

Question 16

What are some use cases for using DynamoDB streams?

Answer 16

• Analytics

- Real time change

Question 17

What is a pre-requisite for using a Global DynamoDB table?

Answer 17

You must enable DynamoDB Streams

Question 18

What 2 indexes are available in DynamoDB?

Answer 18

• Global Secondary Indexes

- Local Secondary Indexes

Question 19

What benefit do you get when using indexes?

Answer 19

They allow you to query on attributes other than the primary key

Question 20

What are DynamoDB Transactions?

Answer 20

The ability to write a transaction to either multiple tables or none

Question 21

What are the 3 Security Options for API Gateway?

Answer 21

• IAM Permissions
• Lambda Authorizer
• Cognito User Pools

Question 22

What does Cognito help with?

Answer 22

It helps with authentication, not authorization