Serverless — Amazon DynamoDB Quiz

Score: 0%Correct: 0Incorrect: 0

Question 1: Before you create a DynamoDB table, you need to provision the EC2 instance the DynamoDB table will be running on.

TrueFalse

Question 2: You have provisioned a DynamoDB table with 10 RCUs and 10 WCUs. A month later you want to increase the RCU to handle more read traffic. What should you do?

Increase RCU and keep WCU the sameYou need to increase both RCU and WCUIncrease RCU and decrease WCU

Question 3: You have an e-commerce website where you are using DynamoDB as your database. You are about to enter the Christmas sale and you have a few items which are very popular and you expect that they will be read often. Unfortunately, last year due to the huge traffic you had the ProvisionedThroughputExceededException exception. What would you do to prevent this error from happening again?

Increase the RCU to a very high valueCreate a DAX ClusterMigrate the database away from DynamoDB for the time of the sale

Question 4: You have developed a mobile application that uses DynamoDB as its datastore. You want to automate sending welcome emails to new users after they sign up. What is the most efficient way to achieve this?

Schedule a Lambda function to run every minute using CloudWatch Events, scan the entire table looking for new usersEnable SNS and DynamoDB integrationEnable DynamoDB Streams and configure it to invoke a Lambda function to send emails

Question 5: You are running an application in production that is leveraging DynamoDB as its datastore and is experiencing smooth sustained usage. There is a need to make the application run in development mode as well, where it will experience the unpredictable volume of requests. What is the most cost-effective solution that you recommend?

Use Provisioned Capacity Mode with Auto Scaling enabled for both development and productionUse Provisioned Capacity Mode with Auto Scaling enabled for production and use On-Demand Capacity Mode for developmentUse Provisioned Capacity Mode with Auto Scaling enabled for development and use On-Demand Capacity Mode for productionUse On-Demand Capacity Mode for both development and production

Question 6: The maximum size of an item in a DynamoDB table is ...................

1 MB500 KB400 KB400 MB

Question 7: A company has a serverless application on AWS which consists of Lambda, DynamoDB, and Step Functions. In the last month, there are an increase in the number of requests against the application which results in an increase in DynamoDB costs, and requests started to be throttled. After further investigation, it shows that the majority of requests are read requests against some queries in the DynamoDB table. What do you recommend to prevent throttles and reduce costs efficiently?

Use an EC2 instance with Redis installed and place it between the Lambda function and the DynamoDB tableMigrate from DynamoDB to Aurora and use ElastiCache to cache the most requested read dataMigrate from DynamoDB to S3 and use CloudFront to cache the most requested read dataUse DynamoDB Accelerator (DAX) to cache the most requested read data

Question 8: You are a DevOps engineer in a football company that has a website that is backed by a DynamoDB table. The table stores viewers’ feedback for football matches. You have been tasked to work with the analytics team to generate reports on the viewers’ feedback. The analytics team wants the data in DynamoDB json format and hosted in an S3 bucket to start working on it and create the reports. What is the best and most cost-effective way you can achieve this task?

Select DynamoDB table then select Export to S3Create a Lambda function to read DynamoDB data, convert them to json files, then store the files in S3 bucketUse AWS Transfer FamilyUse AWS DataSync

Question 9: A website is currently in the development process and it is going to be hosted on AWS. There is a requirement to store user sessions for users logged in to the website with an automatic expiry and deletion of expired user sessions. Which of the following AWS services are best suited for this use case?

Store users' sessions in an S3 bucket and enable S3 Lifecycle PolicyStore users' sessions locally in an EC2 instanceStore users' sessions in a DynamoDB table and enable TTLStore users' sessions in an EFS file system