Azure Cosmos DB Azure Cosmos DB is a globally distributed, multi-model database with guaranteed single-digit millisecond latency at the 99th percentile. It supports document (NoSQL), key-value, graph, and column-family data models with five tunable consistency levels. Core Concepts - Account — top-level resource, defines global regions and consistency - Database — a namespace for containers - Container — equivalent to a collection/table, holds items - Partition Key — determines data distribution; critical for performance - Request Unit (RU) — normalized cost of database operations - Consisten…