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| Section | Weight | Objectives |
|---|---|---|
| Development with AWS Services | 32% | - AWS core services development
|
| Deployment | 24% | - CI/CD and deployment strategies
|
| Troubleshooting and Optimization | 18% | - Monitoring and logging
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|
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問題 #885
A development team is creating a serverless application that uses AWS Lambda functions. The team wants to streamline a testing workflow by sharing test events across multiple developers within the same AWS account. The team wants to ensure all developers can use consistent test events without compromising security.
答案：D
解題說明：
Comprehensive and Detailed Step-by-Step Explanation:
Option A: Use Amazon S3 for Shared Test Events:
Storing JSON test event files in an S3 bucket provides a centralized, cost-effective, and highly available solution.
Granular IAM policies can restrict access to specific developers or roles, ensuring security while maintaining consistency for shared test events.
This solution has minimal operational overhead and integrates easily with existing workflows.
Why Other Options Are Incorrect:
Option B: Using DynamoDB and a Lambda function introduces unnecessary complexity for a relatively simple requirement. S3 provides a simpler and more cost-efficient solution.
Option C: AWS Lambda test events are not inherently shareable across developers, making this option invalid.
Option D: Using a Git repository adds operational overhead and requires developers to clone/update repositories for access, which is more cumbersome compared to S3.
References:
Amazon S3 for Centralized Storage
問題 #886
A developer created several AWS Lambda functions that write data to a single Amazon S3 bucket. The developer configured all the Lambda functions to send logs and metrics to Amazon CloudWatch.
The developer receives reports that one of the Lambda functions writes data to the bucket very slowly. The developer needs to measure the latency between the problematic Lambda function and the S3 bucket.
Which solution will meet this requirement?
答案：D
問題 #887
An application makes requests to an Amazon DynamoDB table that is configured with provisioned throughput. The table has a partition key of UserID .
A developer needs to identify items in the table that have a status attribute of " Inactive " . The developer must add a specific email address to the appropriate attribute for all inactive items. The developer attempts to use an AWS Lambda function to update the table items. However, the function fails with the following error:
ConditionalCheckFailedException .
How can the developer resolve this error?
答案：D
解題說明：
In DynamoDB, a ConditionalCheckFailedException occurs when an UpdateItem, PutItem, or DeleteItem operation includes a ConditionExpression that evaluates to false for the target item at the time of the write.
This is expected behavior: DynamoDB uses conditional expressions for optimistic concurrency control and for enforcing business rules atomically at write time.
In this scenario, the developer wants to update only items whose status is Inactive by adding an email address. The most correct way to prevent conditional failures is to ensure the update request's condition matches the intended target state. By adding (or correcting) a condition expression such as #st = :inactive (with expression attribute names/values), the update will proceed only when the item's status is actually " Inactive " . Items that are " Active " will be skipped by design rather than causing unexpected failures in the workflow.
Option B checks whether the email attribute exists, but that does not enforce the key business rule ("only inactive items") and may still fail depending on whether the attribute is present or absent across items. Option C (retry on ConditionalCheckFailedException) is not appropriate: the failure is not transient like throttling; it indicates the condition was not met, and retrying will likely fail again unless the item changes state. Option D is unrelated because email format validation is not what triggers DynamoDB conditional failures; the exception is about the conditional expression not matching item state.
Therefore, the correct fix is A : update the request's conditional expression to explicitly check that status equals " Inactive " before applying the update. This ensures only the intended items are modified and eliminates unnecessary conditional failures.
問題 #888
A company's developer has deployed an application in AWS by using AWS CloudFormation The CloudFormation stack includes parameters in AWS Systems Manager Parameter Store that the application uses as configuration settings. The application can modify the parameter values When the developer updated the stack to create additional resources with tags, the developer noted that the parameter values were reset and that the values ignored the latest changes made by the application. The developer needs to change the way the company deploys the CloudFormation stack. The developer also needs to avoid resetting the parameter values outside the stack.
Which solution will meet these requirements with the LEAST development effort?
答案：C
解題說明：
* Problem: CloudFormation updates reset Parameter Store parameters, disrupting application behavior.
* Deletion Policy: CloudFormation has a deletion policy that controls resource behavior when a stack is deleted or updated. The 'Retain' policy instructs CloudFormation to preserve a resource's current state.
* Least Development Effort: This solution involves a simple CloudFormation template modification, requiring minimal code changes.
References:
* CloudFormation Deletion Policies: https://docs.aws.amazon.com/AWSCloudFormation/latest
/UserGuide/aws-attribute-deletionpolicy.html
問題 #889
An ecommerce company is using an AWS Lambda function behind Amazon API Gateway as its application tier. To process orders during checkout, the application calls a POST API from the frontend. The POST API invokes the Lambda function asynchronously. In rare situations, the application has not processed orders. The Lambda application logs show no errors or failures.
What should a developer do to solve this problem?
答案：A
問題 #890
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