DVA-C01 (Page 7)

A developer at a company recently created a serverless application to process and show data from business reports.The application’s user interface (UI) allows users to select and start processing the flies.The UI displays a message when the result is available to view.The application uses AWS Step Functions with AWSLambda functions to process the files.The developer used Amazon API Gateway and Lambda functions to create an API to support the UI.The company’s UI team reports that the request to process a file s often returning timeout errors because of the size or complexity of the files.The UI team wants the API to provide an immediate response so that the UI can display a message while the files are being processed.The backend process that is invoked by theAPI needs to send an email message when the report processing is complete.What should the developer do to configure the API to meet these requirements?Read More →

A developer has an application that asynchronously invokes an AWS Lambda function.The developer wants to store messages that resulted in failed invocations of the Lambda function so that the application can retry the call later.What should the developer do to accomplish this goal with the LEAST operational overhead?Read More →

A developer is designing an Amazon DynamoDB table for an application.The application will store user information that includes a unique identifier and an email address for each user.The application must be able to query the table by using either the unique identifier or the email address.How should the developer design the DynamoDB table to meet these requirements?Read More →

A developer is working on a web application that runs on Amazon Elastic Container Service (Amazon ECS) and uses an Amazon DynamoDB table to store data.The application performs a large number of read requests against a small set of the table data.How can the developer improve the performance of these requests? (Choose two.)Read More →

A development team has been using a builder server that is hosted on an Amazon EC2 instance to perform builds and deployments for the last 3 months.TheEC2 instance’s instance profile uses an IAM role that contains the Administrator Access managed policy.The development team must replace that policy with a policy that provides only the required permissions.What is the FASTEST way to create a custom 1AM policy for the EC2 instance to meet this requirement?Read More →

A company hosts a microservices application that uses Amazon API Gateway.AWS Lambda, Amazon Simple Queue Service (Amazon SQS), and AmazonDynamoDB.One of the Lambda functions adds messages to an SQS FIFO queue.When a developer checks the application logs, the developer finds a few duplicated items in a DynamoDB table.The items were inserted by another polling function that processes messages from the queue.What is the MOST likely cause of this issue?Read More →

A company that has multiple offices uses an Amazon DynamoDB table to store employee payroll information. Item attributes consist of employee names, office identifiers, and cumulative daily hours worked The most frequently used query extracts a report of an alphabetical subset of employees for a specific office.Which design of the DynamoDB table primary key will have the MINIMUM performance impact?Read More →

A developer is writing an AWS Lambda function.The Lambda function needs to access items that are stored in an Amazon DynamoDB table.What is the MOST secure way to configure this access for the Lambda function?Read More →

A company has point-of-sale devices across thousands of retail shops that synchronize sales transactions with a centralized system.The system includes anAmazon API Gateway API that exposes an AWS Lambda function.The Lambda function processes the transactions and stores the transactions in Amazon RDS for MySQL.The number of transactions increases rapidly during the day and is near zero at night.How can a developer increase the elasticity of the system MOST cost-effectively?Read More →

A company is using AWS CodeDeploy for all production deployments.A developer has an Amazon Elastic Container Service (Amazon ECS) application that uses the CodeDeployDefault.ECSAIIAtOnce configuration.The developer needs to update the production environment in increments of 10% until the entire production environment is updated.Which CodeDeploy configuration should the developer use to meet these requirements?Read More →