Developer Associate (Page 72)

A company with multiple branch locations has an analytics and reporting application.Each branch office pushes a sales report to a shared Amazon S3 bucket at a predefined time each day.The company has developed an AWS Lambda function that analyzes the reports from all branch offices in a single pass.The Lambda function stores the results in a database.The company needs to start the analysis once each day at a specific time.Which solution will meet these requirements MOST cost-effectively?Read More →

A developer is building an event-driven application by using AWS Lambda and Amazon EventBridge.The Lambda function needs to push events to an EventBridge event bus.The developer uses an SDK to run the PutEvents EventBridge action and specifies no credentials in the code.After deploying the Lambda function, the developer notices that the function is failing and there are AccessDeniedException errors in the logs.How should the developer resolve this issue?Read More →

A developer is creating a simple proof-of-concept demo by using AWS CloudFormation and AWS Lambda functions.The demo will use a CloudFormation template to deploy an existing Lambda function.The Lambda function uses deployment packages and dependencies stored in Amazon S3.The developer defined an AWS::Lambda::Function resource in a CloudFormation template.The developer needs to add the S3 bucket to the CloudFormation template.What should the developer do to meet these requirements with the LEAST development effort?Read More →

A company runs its website on AWS.The company posts daily polls on its website and publishes the poll results next day.The website stores user responses in an Amazon DynamoDB table.After the poll results are published, the company does not need to keep the user responses.A developer needs to implement a solution that will automatically remove old user responses from the DynamoDB table.The developer adds a new expiration_date attribute to the DynamoDB table.The developer plans to use the expiration_date attribute for the automation.Which solution will meet these requirements with the LEAST development effort?Read More →

A company uses an AWS Lambda function that reads messages from an Amazon Simple Queue Service (Amazon SQS) standard queue.The Lambda function makes an HTTP call to a third-party API for each message.The company wants to ensure that the Lambda function does not overwhelm the third-party API with more than two concurrent requests.Which solution will meet these requirements?Read More →

A developer is designing a serverless application that customers use to select seats for a concert venue.Customers send the ticket requests to an Amazon API Gateway API with an AWS Lambda function that acknowledges the order and generates an order ID.The application includes two additional Lambda functions: one for inventory management and one for payment processing.These two Lambda functions run in parallel and write the order to an Amazon Dynamo DB table.The application must provide seats to customers according to the following requirements.If a seat is accidently sold more than once, the first order that the application received must get the seat.In these cases, the application must process the payment for only the first order.However, if the first order is rejected during payment processing, the second order must get the seat.In these cases, the application must process the payment for the second order.Which solution will meet these requirements?Read More →

A company is expanding the compatibility of its photo-sharing mobile app to hundreds of additional devices with unique screen dimensions and resolutions.Photos are stored in Amazon S3 in their original format and resolution.The company uses an Amazon CloudFront distribution to serve the photos.The app includes the dimension and resolution of the display as GET parameters with every request.A developer needs to implement a solution that optimizes the photos that are served to each device to reduce load time and increase photo quality.Which solution will meet these requirements MOST cost-effectively?Read More →

A developer is working on an existing application that uses Amazon DynamoDB as its data store.The DynamoDB table has the following attributes: partNumber (partition key), vendor (sort key), description, productFamily, and productType.When the developer analyzes the usage patterns, the developer notices that there are application modules that frequently look for a list of products based on the productFamily and productType attributes.The developer wants to make changes to the application to improve performance of the query operations.Which solution will meet these requirements?Read More →

A company has installed smart meters in all its customer locations.The smart meters measure power usage at 1-minute intervals and send the usage readings to a remote endpoint for collection.The company needs to create an endpoint that will receive the smart meter readings and store the readings in a database.The company wants to store the location ID and timestamp information.The company wants to give its customers low-latency access to their current usage and historical usage on demand.The company expects demand to increase significantly.The solution must not impact performance or include downtime while scaling.Which solution will meet these requirements MOST cost-effectively?Read More →

A company has a critical application on AWS. The application exposes an HTTP API by using Amazon API Gateway. The API is integrated with an AWS Lambda function. The application stores data in an Amazon RDS for MySQL DB instance with 2 virtual CPUs (vCPUs) and 64 GB of RAM.Customers have reported that some of the API calls return HTTP 500 Internal Server Error responses. Amazon CloudWatch Logs shows errors for “too many connections.” The errors occur during peak usage times that are unpredictable.The company needs to make the application resilient. The database cannot be down outside of scheduled maintenance hours.Which solution will meet these requirements?Read More →