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Amazon AWS Certified Developer - Associate Sample Questions (Q639-Q644):

NEW QUESTION # 639
A developer maintains a critical business application that uses Amazon DynamoDB as the primary data store The DynamoDB table contains millions of documents and receives 30-60 requests each minute The developer needs to perform processing in near-real time on the documents when they are added or updated in the DynamoDB table How can the developer implement this feature with the LEAST amount of change to the existing application code?

A. Enable a DynamoDB stream on the table Invoke an AWS Lambda function to process the documents.
B. Set up a cron job on an Amazon EC2 instance Run a script every hour to query the table for changes and process the documents
C. Update the application to synchronously process the documents directly after the DynamoDB write
D. Update the application to send a PutEvents request to Amazon EventBridge. Create an EventBridge rule to invoke an AWS Lambda function to process the documents.

Answer: A

Explanation:
DynamoDB Streams: Capture near real-time changes to DynamoDB tables, triggering downstream actions.
Lambda for Processing: Lambda functions provide a serverless way to execute code in response to events like DynamoDB Stream updates.
Minimal Code Changes: This solution requires the least modifications to the existing application.
Reference:
DynamoDB Streams: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.html AWS Lambda: https://aws.amazon.com/lambda/

NEW QUESTION # 640
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'?

A. Perform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.
B. Create a local secondary index (LSI) on the songs table that uses artistName as the partition key Perform a query operation for each artistName on the songs table that filters by the list of songName Perform a query operation for each artistName on the artists table
C. Perform a BatchGetltem operation on the songs table that uses the songName/artistName keys. Perform a BatchGetltem operation on the artists table that uses artistName as the key.
D. Perform a BatchGetltem operation that returns items from the two tables. Use the list of songName artistName keys for the songs table and the list of artistName key for the artists table.

Answer: D

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.

NEW QUESTION # 641
A developer is designing an AWS Lambda function that creates temporary files that are less than 10 MB during invocation. The temporary files will be accessed and modified multiple times during invocation. The developer has no need to save or retrieve these files in the future.
Where should the temporary files be stored?

A. Amazon Elastic Block Store (Amazon EBS)
B. the /tmp directory
C. Amazon Elastic File System (Amazon EFS)
D. Amazon S3

Answer: B

NEW QUESTION # 642
A developer is setting up a deployment pipeline. The pipeline includes an AWS CodeBuild build stage that requires access to a database to run integration tests. The developer is using a buildspec.yml file to configure the database connection. Company policy requires automatic rotation of all database credentials.
Which solution will handle the database credentials MOST securely?

A. Retrieve the credentials from an environment variable that is linked to an AWS Secrets Manager secret.
Configure Secrets Manager for automatic
rotation.
B. Retrieve the credentials from an environment variable that contains the connection string in plaintext.
Configure an Amazon EventBridge event to rotate the credentials.
C. Retrieve the credentials from variables that are hardcoded in the buildspec.yml file. Configure an AWS Lambda function to rotate the credentials.
D. Retrieve the credentials from an environment variable that is linked to a SecureString parameter in AWS Systems Manager Parameter Store. Configure Parameter Store for automatic rotation.

Answer: D

NEW QUESTION # 643
A developer is implementing an AWS Cloud Development Kit (AWS CDK) serverless application.
The developer will provision several AWS Lambda functions and Amazon API Gateway APIs during AWS CloudFormation stack creation. The developer's workstation has the AWS Serverless Application Model (AWS SAM) and the AWS CDK installed locally.
How can the developer test a specific Lambda function locally?

A. Run the sam package and sam deploy commands. Create a Lambda test event from the AWS Management Console. Test the Lambda function.
B. Run the cdk synth and sam local invoke commands with the function construct identifier and the path to the synthesized CloudFormation template.
C. Run the cdk synth and sam local start-lambda commands with the function construct identifier and the path to the synthesized CloudFormation template.
D. Run the cdk synth and cdk deploy commands. Create a Lambda test event from the AWS Management Console. Test the Lambda function.

Answer: B

Explanation:
Use the AWS SAM CLI sam local invoke subcommand to initiate a one-time invocation of an AWS Lambda function locally.
https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/using-sam-cli- local-invoke.html

NEW QUESTION # 644
......

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