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A company is building an application for stock trading.The application needs sub-millisecond latency for processing trade requests.The company uses Amazon DynamoDB to store all the trading data that is used to process each trading request.A development team performs load testing on the application and finds that the data retrieval time is higher than expected.The development team needs a solution that reduces the data retrieval time with the least possible effort.Which solution meets these requirements?Read More →

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A developer is modifying an existing AWS Lambda function.While checking the code, the developer notices hardcoded parameter values for an Amazon RDS for SQL Server user name, password, database, host, and port.There are also hardcoded parameter values for an Amazon DynamoDB table, an Amazon S3 bucket, and an Amazon Simple Notification Service (Amazon SNS) topic.The developer wants to securely store the parameter values outside the code in an encrypted format and wants to turn on rotation for the credentials.The developer also wants to be able to reuse the parameter values from other applications and to update the parameter values without modifying code.Which solution will meet these requirements with the LEAST operational overhead?Read More →

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A mobile app stores blog posts in an Amazon DynamoDB table.Millions of posts are added every day, and each post represents a single item in the table.The mobile app requires only recent posts.Any post that is older than 48 hours can be removed.What is the MOST cost-effective way to delete posts that are older than 48 hours?Read More →

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A developer has an application that is composed of many different AWS Lambda functions.The Lambda functions all use some of the same dependencies.To avoid security issues, the developer is constantly updating the dependencies of all of the Lambda functions.The result is duplicated effort for each function.How can the developer keep the dependencies of the Lambda functions up to date with the LEAST additional complexity?Read More →

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A company is using Amazon RDS as the backend database for its application.After a recent marketing campaign, a surge of read requests to the database increased the latency of data retrieval from the database.The company has decided to implement a caching layer in front of the database.The cached content must be encrypted and must be highly available.Which solution will meet these requirements?Read More →

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A company has a web application that is hosted on Amazon EC2 instances.The EC2 instances are configured to stream logs to Amazon CloudWatch Logs.The company needs to receive an Amazon Simple Notification Service (Amazon SNS) notification when the number of application error messages exceeds a defined threshold within a 5-minute period.Which solution will meet these requirements?Read More →

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A company has migrated an application to Amazon EC2 instances.Automatic scaling is working well for the application user interface.However, the process to deliver shipping requests to the company’s warehouse staff is encountering issues.Duplicate shipping requests are arriving, and some requests are lost or arrive out of order.The company must avoid duplicate shipping requests and must process the requests in the order that the requests arrive.Requests are never more than 250 KB in size and take 5-10 minutes to process.A developer needs to rearchitect the application to improve the reliability of the delivery and processing of the requests.What should the developer do to meet these requirements?Read More →