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Lessons (7)

• Caching, Consistent Hashing and Sharding

  … and database consistency costs. Three different tools ![A request can use cache for speed, consistent hashing for stable …

• Scaling, Load Balancing & Rate Limiting

  … active requests Requests vary in duration IP hash / consistent hashing Same client → same server Need stickiness or cache …

• Topics, Partitions & Offsets

  … order-42"] -- "hash → 1" P1[Partition 1] K2["key: order-77"] -- "hash → 0" P0[Partition 0] K3["key …

• Replication, Partitioning & Sharding

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

• SQL vs NoSQL Databases

  … Very organised, very consistent. - NoSQL is like a filing cabinet of folders : each folder (document) holds everything about …

• REST API Design

  … User not found } Checklist - [ ] Plural nouns, no verbs in paths - [ ] Correct methods and status codes - [ ] One consistent error …

• Database Indexing & Transactions

  … tree (default) = , < , , BETWEEN , ORDER BY , prefix LIKE 'abc%' Hash Equality only GIN Full-text search, JSONB, arrays GiST …