Amazon (DVA-C01) Exam Questions And Answers page 17
A Developer has an e-commerce API hosted on Amazon ECS. Variable and spiking demand on the application is causing order processing to take too long. The application processes Amazon SQS queues. The ApproximateNumberOfMessagesVisible metric spikes at very high values throughout the day, which cause Amazon CloudWatch alarm breaches. Other ECS metrics for the API containers are well within limits.
What can the Developer implement to improve performance while keeping costs low?
What can the Developer implement to improve performance while keeping costs low?
Networking and Content Delivery
Monitoring and Troubleshooting
A Developer has a stateful web server on-premises that is being migrated to AWS. The Developer must have greater elasticity in the new design.
How should the Developer re-factor the application to make it more elastic? (Choose two.)
How should the Developer re-factor the application to make it more elastic? (Choose two.)
Storage Services
Deployment and Management
A Developer has been asked to build a real-time dashboard web application to visualize the key prefixes and storage size of objects in Amazon S3 buckets. Amazon DynamoDB will be used to store the Amazon S3 metadata.
What is the optimal and MOST cost-effective design to ensure that the real-time dashboard is kept up to date with the state of the objects in the Amazon S3 buckets?
What is the optimal and MOST cost-effective design to ensure that the real-time dashboard is kept up to date with the state of the objects in the Amazon S3 buckets?
Storage Services
Networking and Content Delivery
A Developer has been asked to create an AWS Lambda function that is triggered any time updates are made to items in an Amazon DynamoDB table. The function has been created, and appropriate permissions have been added to the Lambda execution role. Amazon DynamoDB streams have been enabled for the table, but the function is still not being triggered.
Which option would enable DynamoDB table updates to trigger the Lambda function?
Which option would enable DynamoDB table updates to trigger the Lambda function?
Compute Services
Database Services
A Developer has been asked to make changes to the source code of an AWS Lambda function. The function is managed using an AWS CloudFormation template. The template is configured to load the source code from an Amazon S3 bucket. The Developer manually created a .ZIP file deployment package containing the changes and put the file into the correct location on Amazon S3. When the function is invoked, the code changes have not been applied.
What step is required to update the function with the changes?
What step is required to update the function with the changes?
Storage Services
Deployment and Management
A developer has built a market application that stores pricing data in Amazon DynamoDB with Amazon ElastiCache in front. The prices of items in the market change frequently. Sellers have begun complaining that, after they update the price of an item, the price does not actually change in the product listing.
What could be causing this issue?
What could be causing this issue?
Database Services
Networking and Content Delivery
A Developer has built an application running on AWS Lambda using AWS Serverless Application Model (AWS SAM).
What is the correct order of execution to successfully deploy the application?
What is the correct order of execution to successfully deploy the application?
Security and Identity Services
Deployment and Management
A developer has built an application using Amazon Cognito for authentication and authorization. After a user is successfully logged in to the application, the application creates a user record in an Amazon DynamoDB table.
What is the correct flow to authenticate the user and create a record in the DynamoDB table?
What is the correct flow to authenticate the user and create a record in the DynamoDB table?
Compute Services
Storage Services
A Developer has code running on Amazon EC2 instances that needs read-only access to an Amazon DynamoDB table.
What is the MOST secure approach the Developer should take to accomplish this task?
What is the MOST secure approach the Developer should take to accomplish this task?
Storage Services
Security and Identity Services
A Developer has code running on Amazon EC2 instances that needs read-only access to an Amazon DynamoDB table.
What is the MOST secure approach the Developer should take to accomplish this task?
What is the MOST secure approach the Developer should take to accomplish this task?
Database Services
Security and Identity Services
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