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The AWS Certified Developer - Associate certification exam, also known as Amazon DVA-C02, is designed for professionals who want to demonstrate their expertise in developing and deploying AWS applications. DVA-C02 Exam Tests a candidate's ability to write code using AWS services, design and deploy scalable and highly available systems, and troubleshoot common issues.
NEW QUESTION # 743
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: A
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 # 744
A developer is responsible for three AWS Lambda functions that run in the same AWS account.
The functions are named Lambda A, Lambda B, and Lambda C. The AWS account has a concurrent executions quota of 1,000.
Lambda A needs to use up to 80% of the concurrent execution quota to support business operations. However, the developer notices that Lambda B and Lambda C occasionally use more than 20% of the concurrent execution quota. High load from Lambda B and Lambda C causes throttling errors for Lambda A.
The developer must ensure that Lambda A never experiences throttling errors. Throttling issues for Lambda B and Lambda C are tolerable. However, Lambda B and Lambda C must handle as much traffic as possible.
Which solution will meet these requirements?
Answer: C
Explanation:
Set reserved concurrency of 100 for Lambda B and Lambda C to cap their usage and reserve
200 capacity, leaving 800 (80%) guaranteed for Lambda A; this prevents A's throttling while allowing B and C to process up to their limits.
NEW QUESTION # 745
A developer is working on an app for a company that uses an Amazon DynamoDB table named Orders to store customer orders. The table uses OrderlD as the partition key and there is no sort key. The table contains more than 100,000 records. The developer needs to add a functionality that will retrieve all Orders records that contain an OrderSource attribute with the MobileApp value.
Which solution will improve the user experience in the MOST efficient way?
Answer: C
Explanation:
Requirement Summary:
* DynamoDB table Orders
* Partition key: OrderID
* No sort key
* 100,000+ records
* Need toefficiently retrieveall records where:
* OrderSource = "MobileApp"
* Mustoptimize for user experience(i.e., performance)
Evaluate Options:
Option A: Scan with FilterExpression
* #Inefficientfor large tables
* AScanreadsevery itemin the table and then applies a filter condition.
* This isslow, expensive, andnot scalableas the dataset grows.
Option B: Create a Local Secondary Index (LSI) with OrderSource
* #Invalid: LSIs require thesame partition key(OrderID) as the base table.
* Since OrderSource is not part of the primary key, and we want to querybased on it, LSI won't help.
Option C: Create a GSI with OrderSource as the sort key
* #Misuse of sort key: Querying bysort key alone is not allowedin DynamoDB.
* Youmust specify a partition keyin a Query.
* This design is not valid for the use case.
Option D: Create a GSI with OrderSource as the partition key
* ##BEST CHOICE: With a GSI on OrderSource, you canquery efficientlyfor all items where OrderSource = "MobileApp".
* DynamoDB GSIs allow analternative access patternfor queries not supported by the base table schema.
* GSI Design:https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/GSI.html
* Querying a GSI:https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Query.html
* Scan vs Query:https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-query-scan.
html
NEW QUESTION # 746
A company is building a micro services app1 cation that consists of many AWS Lambda functions. The development team wants to use AWS Serverless Application Model (AWS SAM) templates to automatically test the Lambda functions. The development team plans to test a small percentage of traffic that is directed to new updates before the team commits to a full deployment of the application.
Which combination of steps will meet these requirements in the MOST operationally efficient way? (Select TWO.)
Answer: B,E
Explanation:
This solution will meet the requirements by using AWS Serverless Application Model (AWS SAM) templates and gradual deployments to automatically test the Lambda functions. AWS SAM templates are configuration files that define serverless applications and resources such as Lambda functions. Gradual deployments are a feature of AWS SAM that enable deploying new versions of Lambda functions incrementally, shifting traffic gradually, and performing validation tests during deployment. The developer can enable gradual deployments through AWS SAM templates by adding a DeploymentPreference property to each Lambda function resource in the template. The developer can set the deployment preference type to Canary10Percent30Minutes, which means that 10 percent of traffic will be shifted to the new version of the Lambda function for 30 minutes before shifting 100 percent of traffic. The developer can also use hooks to test the deployment, which are custom Lambda functions that run before or after traffic shifting and perform validation tests or rollback actions.
NEW QUESTION # 747
A company has an AWS Step Functions state machine named myStateMachine.
The company configured a service role for Step Functions.
The developer must ensure that only the myStateMachine state machine can assume the service role.
Answer: A,B
Explanation:
Comprehensive Detailed Step by Step Explanation with All AWS Developer Reference:
To ensure that only a specific AWS Step Functions state machine (myStateMachine) can assume the service role, you must configure the correct trust policy in AWS IAM.
Trust Policies: Trust policies determine which entities (services or users) are allowed to assume the role. In this case, we want to restrict the trust policy to only allow the specific state machine (myStateMachine) to assume the role.
Using ArnLike: The condition "ArnLike" is used to specify that the SourceArn (which refers to the ARN of the entity assuming the role) must match a specific ARN. Option A specifies the exact ARN of the myStateMachine state machine, ensuring that only this state machine can assume the role.
Option B: This option is incorrect because it uses a wildcard (*) for the account ID, which would allow any state machine in the ap-south-1 region to assume the role, not just the specific one.
Reference:
AWS Step Functions IAM Policies
NEW QUESTION # 748
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