A company runs an e-commerce website that uses Amazon DynamoDB where pricing for items is dynamically updated in real time. At any given time, multiple updates may occur simultaneously for pricing information on a particular product. This is causing the original editor's changes to be overwritten without a proper review process.
Which DynamoDB write option should be selected to prevent this overwriting?

• A.Concurrent writes
• B.Conditional writes
• C.Atomic writes
• D.Batch writes

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A Developer wants access to make the log data of an application running on an EC2 instance available to systems administrators.
Which of the following enables monitoring of this metric in Amazon CloudWatch?

• A.Launch a new EC2 instance, configure Amazon CloudWatch Events, and then install the application.
• B.Install the Amazon CloudWatch Logs agent on the EC2 instance that the application is running on.
• C.Retrieve the log data from AWS CloudTrail using the LookupEvents API call.
• D.Retrieve the log data from CloudWatch using the GetMetricData API call

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A company has a two-tier application running on an Amazon EC2 server that handles all of its AWS based e-commerce activity During peak times, the backend servers that process orders are overloaded with requests. This results in some orders failing to process. A developer needs to create a solution that will re-factor the application.
Which steps will allow for more flexibility during peak times, while still remaining cost-effective? (Select TWO.)

• A.Modify the backend servers to pull from an Amazon SQS queue.
• B.Use an Amazon SNS queue to decouple the front-end and backend servers.
• C.Migrate the backend servers to on-premises and pull from an Amazon SNS queue
• D.Increase the backend T2 EC2 instance sees to xl to handle the largest possible load throughout the year
• E.implement an Amazon SQS queue to decouple the front-end and backend servers

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A developer is trying to get data from an Amazon DynamoDB table called demoman-table The developer configured the AWS CLI to use a specific 1AM user's credentials and executed the following command:
aws dynamodb get-item table-name demoman-table --key '("id": <"N''; ''1993''}} ' The command returned errors and no rows were returned What is the MOST likely cause of these issues?

• A.The developer needs to log a ticket with AWS Support to enable access to the demoman-table.
• B.The 1AM user needs an associated policy with read access to demoman-table.
• C.The command is incorrect; it should be rewritten to use : ut-i t am with a string argument.
• D.Amazon DynamoDB cannot be accessed from the AWS CLI and needs to be called via the REST API

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An application displays a status dashboard. The status is updated by 1 KB messages from an SQS queue.
Although the status changes infrequently, the Developer must minimize the time between the message arrival in the queue and the dashboard update.
What technique provides the shortest delay in updating the dashboard?

• A.Retrieve the messages from the queue using long polling every 20 seconds.
• B.Reduce the size of the messages by compressing them before sending.
• C.Retrieve the messages from the queue using short polling every 10 seconds.
• D.Reduce the size of each message payload by sending it in two parts.

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