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Amazon AWS Certified Developer Associate Exam (DVA-C02) Sample Questions (Q57-Q62):

NEW QUESTION # 57
A developer is building an application that includes an AWS Lambda function that is written in .NET Core.
The Lambda function's code needs to interact with Amazon DynamoDB tables and Amazon S3 buckets. The developer must minimize the Lambda function's deployment time and invocation duration.
Which solution will meet these requirements?

A. Include the entire AWS SDK for .NET in the Lambda function's deployment package.
B. Include only the AWS SDK for .NET modules for DynamoDB and Amazon S3 in the Lambda function's deployment package.
C. Increase the Lambda function's memory.
D. Configure the Lambda function to download the AWS SDK for .NET from an S3 bucket at runtime.

Answer: B

NEW QUESTION # 58
During non-peak hours, a Developer wants to minimize the execution time of a full Amazon DynamoDB table scan without affecting normal workloads. The workloads average half of the strongly consistent read capacity units during non-peak hours.
How would the Developer optimize this scan?

A. Increase read capacity units during the scan operation
B. Change consistency to eventually consistent during the scan operation
C. Use sequential scans
D. Use parallel scans while limiting the rate

Answer: D

Explanation:
Explanation
Parallel scans would help improve the scan performance while using limit parameter the provisioned throughput consumed can be limited.
Refer AWS documentation - DynamoDB Parallel Scan
By default, the Scan operation processes data sequentially. DynamoDB returns data to the application in 1 MB increments, and an application performs additional operations to retrieve the next 1 MB of data.
The larger the table or index being scanned, the more time the take to complete. In addition, a sequential Scan might not always be able to fully utilize the provisioned read throughput capacity: Even though DynamoDB distributes a large table s data across multiple physical partitions, a Scan operation can only read one partition at a time. For this reason, the throughput of a is constrained by the maximum throughput of a single partition.
To address these issues, the Scan operation can logically divide a table or secondary index into multiple segments, with multiple application workers scanning the segments in parallel. Each worker can be a thread (in programming languages that support multithreading) or an operating system process.
A parallel scan with a large number of workers can easily consume all of the provisioned throughput for the table or index being scanned. It is best to avoid such scans if the table or index is also incurring heavy read or write activity from other applications.
To control the amount of data returned per request, use the Limit parameter. This can help prevent situations where one worker consumes all of the provisioned throughput, at the expense of all other workers.

NEW QUESTION # 59
A Developer is creating a Lambda function and will be using external libraries that are not included in the standard Lambda libraries.
What action would minimize the Lambda compute time consumed?

A. Install the dependencies and external libraries at the beginning of the Lambda function.
B. Copy the external libraries to Amazon S3, and reference the external libraries to the S3 location.
C. Install the external libraries in Lambda to be available to all Lambda functions.
D. Create a Lambda deployment package that includes the external libraries.

Answer: C

NEW QUESTION # 60
A developer is building a serverless application that is based on AWS Lambda. The developer initializes the AWS software development kit (SDK) outside of the Lambda handcar function.
What is the PRIMARY benefit of this action?

A. Provides better error handling
B. Takes advantage of runtime environment reuse
C. Improves legibility and systolic convention
D. Creates a new SDK instance for each invocation

Answer: B

Explanation:
This benefit occurs when initializing the AWS SDK outside of the Lambda handler function because it allows the SDK instance to be reused across multiple invocations of the same function. This can improve performance and reduce latency by avoiding unnecessary initialization overhead. If the SDK is initialized inside the handler function, it will create a new SDK instance for each invocation, which can increase memory usage and execution time.
Reference: [AWS Lambda execution environment], [Best Practices for Working with AWS Lambda Functions]

NEW QUESTION # 61
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 createDeploymentmethod must be called so the API can be redeployed to include the newly created API key.
B. The importApiKeysmethod must be called to import all newly created API keys into the current stage of the API.
C. The createUsagePlanKeymethod must be called to associate the newly created API key with the correct usage plan.
D. The updateAuthorizer method must be called to update the API's authorizer to include the newly created API key.

Answer: B

NEW QUESTION # 62
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