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NEW QUESTION # 154
A company has developed an application that uses AWS Lambda functions to process messages from an Amazon SQS queue. One of the Lambda functions makes a call to an external API that is expected to encounter temporary service unavailability.
A developer needs to configure the function to retry failed messages from an Amazon SQS dead-letter queue. The developer notices that the Lambda function is re-processing some messages in the queue more than once.
Which solution will resolve this issue?
Answer: B
Explanation:
Comprehensive Detailed Explanation with all AWS Reference
Why Option B is Correct:
Setting the visibility timeout ensures that once a message is being processed, it is temporarily hidden from other consumers. The Lambda function must delete processed messages to avoid re-processing when the visibility timeout expires.
Why Other Options are Incorrect:
Option A: Message retention affects how long messages stay in the queue, not how they are processed.
Option C: Receive message wait time optimizes long polling but does not prevent re-processing.
Option D: Delivery delay introduces latency for new messages and does not address message re-processing.
AWS Documentation Reference:
Using SQS Visibility Timeout
NEW QUESTION # 155
A developer needs to troubleshoot an AWS Lambda function in a development environment. The Lambda function is configured in VPC mode and needs to connect to an existing Amazon RDS for SQL Server DB instance. The DB instance is deployed in a private subnet and accepts connections by using port 1433.
When the developer tests the function, the function reports an error when it tries to connect to the database.
Which combination of steps should the developer take to diagnose this issue? (Choose two.)
Answer: A,D
Explanation:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/lambda-rds-connect.html
NEW QUESTION # 156
A company has an application that uses an Amazon Cognito user pool for authentication. A developer needs to add a new REST API that will use the user pool to authenticate requests.
Which solution will meet this requirement with the LEAST development effort?
Answer: D
NEW QUESTION # 157
A developer is working on a web application that uses Amazon DynamoDB as its data store The application has two DynamoDB tables one table that is named artists and one table that is named songs The artists table has artistName as the partition key. The songs table has songName as the partition key and artistName as the sort key The table usage patterns include the retrieval of multiple songs and artists in a single database operation from the webpage. The developer needs a way to retrieve this information with minimal network traffic and optimal application performance.
Which solution will meet these requirements'?
Answer: A
Explanation:
Scenario: Application needs to fetch songs and artists efficiently in a single operation.
BatchGetItem: This DynamoDB operation retrieves multiple items across different tables based on their primary keys in a single request.
Optimized for Request Batching: This approach reduces network traffic compared to performing multiple queries individually.
Data Modeling: The songs table is designed appropriately for this access pattern using artistName as the sort key.
Reference:
Amazon DynamoDB BatchGetItem: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.ht
NEW QUESTION # 158
A developer is writing unit tests for a new application that will be deployed on AWS. The developer wants to validate all pull requests with unit tests and merge the code with the main branch only when all tests pass.
The developer stores the code in AWS CodeCommit and sets up AWS CodeBuild to run the unit tests. The developer creates an AWS Lambda function to start the CodeBuild task. The developer needs to identify the CodeCommit events in an Amazon EventBridge event that can invoke the Lambda function when a pull request is created or updated.
Which CodeCommit event will meet these requirements?
Answer: A
Explanation:
https://docs.aws.amazon.com/codecommit/latest/userguide/monitoring-events.html#pullRequestSourceBranchUpdated
NEW QUESTION # 159
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