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Lessons (5)

• Replication, Partitioning & Sharding

  Scale reads with replicas, split data safely with partitions and shards, and plan for consistency, hot keys and …

• Caching, Consistent Hashing and Sharding

  … Choose a stable shard key such as tenant or user ID, and remember: cache is never the source …

• Scaling, Load Balancing & Rate Limiting

  … Vertical vs horizontal scaling, load balancers, stateless servers, replication, sharding, rate limiting and resilience basics. The big idea …

• SQL vs NoSQL Databases

  … were built to spread data across many machines (sharding) from day one. SQL databases can scale out too …

• Caching & Redis

  … You can use both. - Replication + Sentinel: automatic failover to a replica. - Redis Cluster: shards data across nodes using …