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問題 #647
A developer has an application that makes batch requests directly to Amazon DynamoDB by using the BatchGetItem low-level API operation. The responses frequently return values in the UnprocessedKeys element.
Which actions should the developer take to increase the resiliency of the application when the batch response includes values in UnprocessedKeys? (Choose two.)
答案：C,E
解題說明：
The UnprocessedKeys element indicates that the BatchGetItem operation did not process all of the requested items in the current response. This can happen if the response size limit is exceeded or if the table's provisioned throughput is exceeded. To handle this situation, the developer should retry the batch operation with exponential backoff and randomized delay to avoid throttling errors and reduce the load on the table. The developer should also use an AWS SDK to make the requests, as the SDKs automatically retry requests that return UnprocessedKeys.
References:
* [BatchGetItem - Amazon DynamoDB]
* [Working with Queries and Scans - Amazon DynamoDB]
* [Best Practices for Handling DynamoDB Throttling Errors]
問題 #648
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?
答案：A
問題 #649
An ecommerce company is developing a serverless application to track user activities. The company needs to track each type of activity with a timestamp and a unique product ID. The company also must track actions that are associated with each activity, such as product views, shopping cart actions, purchases, and checkout processes.
The company is planning a marketing campaign based on each user's activity. A developer needs to implement a partitioning strategy for an Amazon DynamoDB table to meet the data storage and access requirements for the application. The strategy must maximize provisioned throughput efficiency while minimizing the risk of throttling.
Which solution will meet these requirements?
答案：D
解題說明：
For this workload, the access pattern is centered on each user's activity history over time (the company is planning a marketing campaign based on each user's activity). In DynamoDB, the most effective way to store and query time-ordered events per entity is to use a composite primary key where the entity identifier is the partition key and a time attribute is the sort key. Therefore, using user ID as the partition key groups all events for a given user together, and using timestamp as the sort key allows efficient retrieval in chronological order and supports range queries (for example, "activities in the last 7 days" or "between two dates").
This design also helps maximize provisioned throughput efficiency and reduce throttling risk because it distributes data across partitions based on the partition key values (user IDs). With many users, writes and reads naturally spread across multiple partition key values rather than concentrating on a small set. The sort key further enables multiple activity records per user without overwriting items and supports precise queries without scanning.
Option B (product ID as partition key) does not align with the stated marketing need (per-user activity). It would cluster all users' actions for a popular product into the same partition key, increasing the chance of hot partitions and throttling. Option C also risks hot partitions for popular product IDs; auto scaling helps capacity management but does not fix poor key distribution or hot-key access patterns. Option D (monotonic counter as partition key) is particularly problematic: sequential keys can create uneven distribution and a throughput bottleneck pattern, and it does not support user-centric queries efficiently.
Thus, A best matches the data model (user events over time), supports efficient queries, and reduces throttling risk by distributing workload across user IDs.
問題 #650
A company uses AWS Secrets Manager to store API keys for external REST services. The company uses an AWS Lambda function to rotate the API keys on a regular schedule.
Due to an error in the Lambda function, the API keys are successfully updated in AWS Secrets Manager but are not updated in the external REST services. Before investigating the root cause of the issue, the company wants to resume requests to the external REST services as quickly as possible.
Which solution will meet this requirement with the LEAST operational overhead?
答案：B
解題說明：
Comprehensive and Detailed Explanation (250-300 words) From Exact Extract of AWS Developer Documents:
AWS Secrets Manager is designed to securely store, rotate, and manage sensitive information such as API keys, database credentials, and tokens. A core feature of Secrets Manager is secret versioning, which enables recovery from failed or partial rotation events. Each secret version is associated with staging labels, most notably AWSCURRENT and AWSPREVIOUS.
According to AWS documentation, during a successful rotation, Secrets Manager creates a new secret version and assigns it the AWSCURRENT label, while the previous version is retained with the AWSPREVIOUS label. Applications that retrieve secrets typically reference the secret using the AWSCURRENT label. If a rotation fails after updating the secret value but before synchronizing the change with the external system, authentication failures can occur.
AWS explicitly states that in such scenarios, customers can restore service quickly by moving the AWSCURRENT label back to the previous version. This rollback capability allows applications to immediately resume using the last known valid credentials without modifying application code, redeploying resources, or interacting with external systems.
This approach represents the least operational overhead because it is a metadata-only operation within Secrets Manager. No new secrets are created, no Lambda functions are invoked, and no manual updates are required in the external REST services. Additionally, AWS recommends postponing troubleshooting until service availability is restored, which aligns precisely with the requirement in this scenario.
Other options introduce unnecessary complexity, increased risk of human error, and longer recovery times.
Therefore, rolling back to the last working secret version is the fastest, safest, and AWS-recommended solution.
問題 #651
A developer has a continuous integration and continuous delivery (CI/CD) pipeline that uses AWS CodeArtifact and AWS CodeBuild. The build artifacts are between 0.5 GB and 1.5 GB in size.
The builds happen frequently and retrieve many dependencies from CodeArtifact each time.
The builds have been slow because of the time it takes to transfer dependencies. The developer needs to improve build performance by reducing the number of dependencies that are retrieved for each build.
Which solution will meet this requirement?
答案：C
解題說明：
Using a local cache in CodeBuild allows you to cache dependencies locally on the build host, which can significantly reduce the time it takes to retrieve dependencies during subsequent builds.
問題 #652
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