AWS Certified Solutions Architect – ProfessionalAccelerate Workload Migration and ModernizationMedium
A company is migrating a critical, high-performance web application to AWS. The application uses a custom caching layer that stores session data and frequently accessed database query results. The company wants to modernize this caching layer to be highly available, scalable, and fully managed to reduce operational overhead. Which AWS service should be used?
- AUtilize Amazon ElastiCache for Redis in a Cluster Mode enabled configuration.
- BDeploy a custom caching solution on Amazon EC2 instances with Auto Scaling.
- CUse Amazon S3 for storing cached objects with lifecycle policies.
- DStore cached data in an Amazon DynamoDB table with on-demand capacity.
Show answer & explanationAnswer & explanation
Correct answer: A. Utilize Amazon ElastiCache for Redis in a Cluster Mode enabled configuration.
Amazon ElastiCache for Redis, especially in a Cluster Mode enabled configuration, provides a fully managed, highly available, and scalable in-memory data store suitable for caching session data and query results. It significantly reduces operational overhead compared to a self-managed solution.
Why the other options are wrong
- B. Deploying a custom caching solution on EC2 instances would require significant operational overhead for management, scaling, and high availability, which contradicts the 'fully managed' and 'reduce operational overhead' requirements.
- C. Amazon S3 is object storage and is not suitable for high-performance, low-latency in-memory caching of session data or query results.
- D. DynamoDB is a NoSQL database, not primarily optimized for in-memory caching, and might introduce higher latency and cost compared to a dedicated caching service for this specific use case.
Amazon ElastiCache
A fully managed in-memory data store and caching service that supports Redis and Memcached, designed to accelerate application performance by retrieving data from fast, managed in-memory caches.
- Supports both Redis and Memcached engines.
- Provides high availability with replication and failover.
- Offers automatic scaling, patching, and backups, reducing operational burden.
Memory trick: ElastiCache for speed, Dynamo for NoSQL, S3 for objects.