AWS Certified Solutions Architect - Associate
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A company hosts a three-tier ecommerce application on a fleet of Amazon EC2 instances. The instances run in an Auto Scaling group behind an Application Load Balancer (ALB). All ecommerce data is stored in an Amazon RDS for MariaDB Multi-AZ DB instance.
The company wants to optimize customer session management during transactions. The application must store session data durably.
Which solutions will meet these requirements? (Choose two.)
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UAnonymous
A
Turn on the sticky sessions feature (session affinity) on the ALB.
B
Use an Amazon DynamoDB table to store customer session information.
C
Deploy an Amazon Cognito user pool to manage user session information.
D
Deploy an Amazon ElastiCache for Redis cluster to store customer session information.
E
Use AWS Systems Manager Application Manager in the application to manage user session information.
Explanation:
Explanation
Correct Answers: B and D
B. Use an Amazon DynamoDB table to store customer session information.
- DynamoDB is a fully managed NoSQL database service that provides durable storage with high availability and scalability.
- It can store session data durably with automatic replication across multiple Availability Zones.
- DynamoDB offers single-digit millisecond latency, making it suitable for session management.
- Data is persisted to disk, ensuring durability even if instances fail.
D. Deploy an Amazon ElastiCache for Redis cluster to store customer session information.
- ElastiCache for Redis provides in-memory data storage with optional persistence features.
- Redis can be configured with AOF (Append Only File) or RDB snapshots for durability.
- It offers extremely low latency for session data access.
- Redis clustering provides high availability and scalability.
Why other options are incorrect:
A. Turn on the sticky sessions feature (session affinity) on the ALB.
- Sticky sessions route user requests to the same EC2 instance, but session data is still stored locally on that instance.
- If the instance fails or is terminated by Auto Scaling, session data is lost.
- This does not provide durable storage of session data.
C. Deploy an Amazon Cognito user pool to manage user session information.
- Amazon Cognito is primarily for user authentication and authorization, not for storing general session data during ecommerce transactions.
- While it manages authentication sessions, it's not designed for storing shopping cart data or transaction state.
E. Use AWS Systems Manager Application Manager in the application to manage user session information.
- AWS Systems Manager Application Manager is for operational management, monitoring, and troubleshooting of applications.
- It's not designed for storing customer session data.
Key Requirements Met:
- Durable storage - Both DynamoDB and ElastiCache Redis (with persistence enabled) provide durable storage.
- Optimized session management - Both provide low-latency access suitable for ecommerce transactions.
- Scalability - Both services can scale to handle varying loads.
- High availability - Both offer multi-AZ deployments for fault tolerance.
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