DVA-C02 (Page 38)

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 →

A developer is building a new application on AWS.The application uses an AWS Lambda function that retrieves information from an Amazon DynamoDB table.The developer hard coded the DynamoDB table name into the Lambda function code.The table name might change over time.The developer does not want to modify the Lambda code if the table name changes.Which solution will meet these requirements MOST efficiently?Read More →

A developer is incorporating AWS X-Ray into an application that handles personal identifiable information (PII).The application is hosted on Amazon EC2 instances.The application trace messages include encrypted PII and go to Amazon CloudWatch.The developer needs to ensure that no PII goes outside of the EC2 instances.Which solution will meet these requirements?Read More →

A company has deployed an application on AWS Elastic Beanstalk.The company has configured the Auto Scaling group that is associated with the Elastic Beanstalk environment to have five Amazon EC2 instances.If the capacity is fewer than four EC2 instances during the deployment, application performance degrades.The company is using the all-at-once deployment policy.What is the MOST cost-effective way to solve the deployment issue?Read More →

A company is building a web application on AWS.When a customer sends a request, the application will generate reports and then make the reports available to the customer within one hour.Reports should be accessible to the customer for 8 hours.Some reports are larger than 1 MB.Each report is unique to the customer.The application should delete all reports that are older than 2 days.Which solution will meet these requirements with the LEAST operational overhead?Read More →

A developer is testing a new file storage application that uses an Amazon CloudFront distribution to serve content from an Amazon S3 bucket.The distribution accesses the S3 bucket by using an origin access identity (OAI).The S3 bucket’s permissions explicitly deny access to all other users.The application prompts users to authenticate on a login page and then uses signed cookies to allow users to access their personal storage directories.The developer has configured the distribution to use its default cache behavior with restricted viewer access and has set the origin to point to the S3 bucket.However, when the developer tries to navigate to the login page, the developer receives a 403 Forbidden error.The developer needs to implement a solution to allow unauthenticated access to the login page.The solution also must keep all private content secure.Which solution will meet these requirements?Read More →

A company needs to harden its container images before the images are in a running state.The company’s application uses Amazon Elastic Container Registry (Amazon ECR) as an image registry.Amazon Elastic Kubernetes Service (Amazon EKS) for compute, and an AWS CodePipeline pipeline that orchestrates a continuous integration and continuous delivery (CI/CD) workflow.Dynamic application security testing occurs in the final stage of the pipeline after a new image is deployed to a development namespace in the EKS cluster.A developer needs to place an analysis stage before this deployment to analyze the container image earlier in the CI/CD pipeline.Which solution will meet these requirements with the MOST operational efficiency?Read More →

A developer needs to migrate an online retail application to AWS to handle an anticipated increase in traffic.The application currently runs on two servers: one server for the web application and another server for the database.The web server renders webpages and manages session state in memory.The database server hosts a MySQL database that contains order details.When traffic to the application is heavy, the memory usage for the web server approaches 100% and the application slows down considerably.The developer has found that most of the memory increase and performance decrease is related to the load of managing additional user sessions.For the web server migration, the developer will use Amazon EC2 instances with an Auto Scaling group behind an Application Load Balancer.Which additional set of changes should the developer make to the application to improve the application’s performance?Read More →