# ADVREL02-BP02 Implement a caching strategy
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 Implementing caching strategies enhances system reliability and performance. Evaluate different caching levels from client-side to server-side, and explore various caching solutions, including ElastiCache, third-party databases, and CDNs for optimizing ad payload delivery and reducing backend load. 

## Implementation guidance
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 Caching can be applied at various levels, such as client-side caching of user-profiles and server-side caching for bid enhancement. Distributed caching solutions include Amazon ElastiCache Redis or Memcached. Third-party databases such as Aerospike, Cassandra, and Scylla Cache are also commonly deployed for server-side caching. Ad Creative payloads are very effectively cached by CDNs, such as CloudFront, further reducing the load on web-servers. 

## Key AWS services
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+  [Amazon ElastiCache](https://aws.amazon.com/elasticache/) is a fully managed in-memory data store 
+  [Amazon API Gateway](https://aws.amazon.com/api-gateway/) also provides a built-in caching layer 
+  [AWS Lambda](https://aws.amazon.com/lambda/), a serverless compute service, can be used to implement caching at the application layer 

## Resources
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 **Related documentation:** 
+  [Amazon ElastiCache (Memcached)](https://aws.amazon.com/elasticache/memcached/index.html) 
+  [Data Caching Across Microservices in a Serverless Architecture](https://aws.amazon.com/blogs/architecture/data-caching-across-microservices-in-a-serverless-architecture/index.html) 
+  [Caching for high-volume workloads with Amazon ElastiCache](https://aws.amazon.com/getting-started/hands-on/purpose-built-databases/elasticache/index.html)