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[Design Resilient Architectures]
A company offers a food delivery service that is growing rapidly. Because of the growth, the company's order processing system is experiencing scaling problems during peak traffic hours. The current architecture includes the following:
* A group of Amazon EC2 instances that run in an Amazon EC2 Auto Scaling group to collect orders from the application
* Another group of EC2 instances that run in an Amazon EC2 Auto Scaling group to fulfill orders
The order collection process occurs quickly, but the order fulfillment process can take longer. Data must not be lost because of a scaling event.
A solutions architect must ensure that the order collection process and the order fulfillment process can both scale properly during peak traffic hours. The solution must optimize utilization of the company's AWS resources.
Which solution meets these requirements?
The number of instances in your Auto Scaling group can be driven by how long it takes to process a message and the acceptable amount of latency (queue delay). The solution is to use a backlog per instance metric with the target value being the acceptable backlog per instance to maintain.
[Design Secure Architectures]
A company has an on-premises MySQL database that handles transactional dat
a. The company is migrating the database to the AWS Cloud. The migrated database must maintain compatibility with the company's applications that use the database. The migrated database also must scale automatically during periods of increased demand.
Which migration solution will meet these requirements?
To migrate a MySQL database to AWS with compatibility and scalability, Amazon Aurora is a suitable option. Aurora is compatible with MySQL and can scale automatically with Aurora Auto Scaling. AWS Database Migration Service (AWS DMS) can be used to migrate the database from on-premises to Aurora with minimal downtime.
What Is Amazon Aurora?
Using Amazon Aurora Auto Scaling with Aurora Replicas
What Is AWS Database Migration Service?
[Design Secure Architectures]
A solutions architect is designing the architecture for a web application that has a frontend and a backend. The backend services must receive data from the frontend services for processing. The frontend must manage access to the application by using API keys. The backend must scale without affecting the frontend.
Which solution will meet these requirements?
Using API Gateway with API keys provides secure access control. Amazon SQS allows asynchronous decoupling between frontend and backend, ensuring that backend processing can scale independently. AWS Lambda reading from SQS ensures scalable, event-driven processing with minimal operational management. This architecture is resilient and decoupled.
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[Design Secure Architectures]
An ecommerce company hosts its analytics application in the AWS Cloud. The application generates about 300 MB of data each month. The data is stored in JSON format. The company is evaluating a disaster recovery solution to back up the dat
a. The data must be accessible in milliseconds if it is needed, and the data must be kept for 30 days.
Which solution meets these requirements MOST cost-effectively?
This solution meets the requirements of a disaster recovery solution to back up the data that is generated by an analytics application, stored in JSON format, and must be accessible in milliseconds if it is needed. Amazon S3 Standard is a durable and scalable storage class for frequently accessed data. It can store any amount of data and provide high availability and performance. It can also support millisecond access time for data retrieval.
Option A is incorrect because Amazon OpenSearch Service (Amazon Elasticsearch Service) is a search and analytics service that can index and query data, but it is not a backup solution for data stored in JSON format. Option B is incorrect because Amazon S3 Glacier is a low-cost storage class for data archiving and long-term backup, but it does not support millisecond access time fordata retrieval. Option D is incorrect because Amazon RDS for PostgreSQL is a relational database service that can store and query structured data, but it is not a backup solution for data stored in JSON format.
https://aws.amazon.com/s3/storage-classes/
https://aws.amazon.com/s3/faqs/#Durability_and_data_protection
A company needs to store confidential files on AWS. The company accesses the files every week. The company must encrypt the files by using envelope encryption, and the encryption keys must be rotated automatically. The company must have an audit trail to monitor encryption key usage.
Which combination of solutions will meet these requirements? (Select TWO.)
