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An online sales company is developing a serverless application that runs on AWS. The application uses an AWS Lambda function that calculates order success rates and stores the data in an Amazon DynamoDB table. A developer wants an efficient way to invoke the Lambda function every 15 minutes.
Which solution will meet this requirement with the LEAST development effort?
A. Create an Amazon EventBridge rule that has a rate expression that will run the rule every 15 minutes.
Add the Lambda function as the target of the EventBridge rule.
B. Provision a small Amazon EC2 instance. Set up a cron job that invokes the Lambda function every 15 minutes.
C. Create an AWS Step Functions state machine. Configure the state machine to invoke the Lambda function execution role at a specified interval by using a Wait state. Set the interval to 15 minutes.
D. Create an AWS Systems Manager document that has a script that will invoke the Lambda function on Amazon EC2. Use a Systems Manager Run Command task to run the shell script every 15 minutes.
Answer: A
Explanation:
Explanation
The best solution for this requirement is option A. Creating an Amazon EventBridge rule that has a rate expression that will run the rule every 15 minutes and adding the Lambda function as the target of the EventBridge rule is the most efficient way to invoke the Lambda function periodically. This solution does not require any additional resources or development effort, and it leverages the built-in scheduling capabilities of EventBridge1.
NEW QUESTION # 96
A company maintains a REST service using Amazon API Gateway and the API Gateway native API key validation. The company recently launched a new registration page, which allows users to sign up for the service. The registration page creates a new API key using CreateApiKey and sends the new key to the user.
When the user attempts to call the API using this key. the user receives a 403 Forbidden error. Existing users are unaffected and can still call the API.
What code updates will grant these new users access to the API?
A. The createUsagePlanKey method must be called to associate the newly created API key with the correct usage plan.
B. The createDeploymer.t method must be called so the API can be redeployed to include the newly created API key.
C. The importApiKeys method must be called to import all newly created API keys into the current stage of the API.
D. The updateAuthorizer method must be called to update the API's authorizer to include the newly created API key
Answer: A
NEW QUESTION # 97
A company is developing an application that will be accessed through the Amazon API Gateway REST API. Registered users should be the only ones who can access certain resources of this API. The token being used should expire automatically and needs to be refreshed periodically.
How can a developer meet these requirements?
A. Create and maintain a database record for each user with a corresponding token and use an AWS Lambda authorizer in API Gateway.
B. Create an IAM user for each API user, attach an invoke permissions policy to the API, and use an IAM authorizer in API Gateway.
C. Create an Amazon Cognito identity pool, configure the Amazon Cognito Authorizer in API Gateway, and use the temporary credentials generated by the identity pool.
D. Create an Amazon Cognito user pool, configure the Cognito Authorizer in API Gateway, and use the identity or access token.
Answer: D
NEW QUESTION # 98
A developer is receiving an intermittent ProvisionedThroughputExceededException error from an application that is based on Amazon DynamoDB. According to the Amazon CloudWatch metrics for the table, the application is not exceeding the provisioned throughput. What could be the cause of the issue?
A. The application is exceeding capacity on a particular sort key.
B. The DynamoDB table storage size is larger than the provisioned size.
C. The application is exceeding capacity on a particular hash key.
D. The DynamoDB table is exceeding the provisioned scaling operations.
Answer: C
Explanation:
DynamoDB distributes throughput across partitions based on the hash key. Ahot partition(caused by high usage of a specific hash key) can result in a ProvisionedThroughputExceededException, even if overall usage is below the provisioned capacity.
* Why Option B is Correct:
* Partition-Level Limits: Each partition has a limit of 3,000 read capacity units or 1,000 write capacity units per second.
* Hot Partition: Excessive use of a single hash key can overwhelm its partition.
* Why Not Other Options:
* Option A: DynamoDB storage size does not affect throughput.
* Option C: Provisioned scaling operations are unrelated to throughput errors.
* Option D: Sort keys do not impact partition-level throughput.
References:
* DynamoDB Partition Key Design Best Practices
NEW QUESTION # 99
A developer is building an ecommerce application. When there is a sale event, the application needs to concurrently call three third-party systems to record the sale. The developer wrote three AWS Lambda functions. There is one Lambda function for each third-party system, which contains complex integration logic.
These Lambda functions are all independent. The developer needs to design the application so each Lambda function will run regardless of others' success or failure.
Which solution will meet these requirements?
A. Publish the sale event from the application to an Application Load Balancer (ALB). Add the three Lambda functions as ALB targets.
B. Publish the sale event from the application to an Amazon Simple Queue Service (Amazon SQS) queue. Configure the three Lambda functions to poll the queue.
C. Publish the sale event from the application to an AWS Step Functions state machine. Move the logic from the three Lambda functions into the Step Functions state machine.
D. Publish the sale event from the application to an Amazon Simple Notification Service (Amazon SNS) topic. Subscribe the three Lambda functions to be triggered by the SNS topic.
Answer: D
NEW QUESTION # 100
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