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Azure Cosmos DB

Azure Cosmos DB is a fully managed NoSQL database for modern app development.

Key Features

  • Global Distribution: Turnkey global distribution to any number of Azure regions.
  • Multi-Model: Supports Key-Value, Column Family, Document, and Graph data models.
  • APIs: SQL (Core), MongoDB, Cassandra, Gremlin, Table.
  • SLA: 99.999% availability for multi-region writes.

Use Cases

  • IoT and Telemetry: Ingesting massive amounts of data in real-time.
  • Retail and E-commerce: storing product catalogs and user profiles.
  • Gaming: Storing player stats and leaderboards.

Key Concepts

  • Request Units (RUs): The currency for throughput. You provision RUs per second.
  • Partition Key: Critical for scaling. Determines how data is distributed across physical partitions.
  • Consistency Levels: Strong, Bounded Staleness, Session, Consistent Prefix, Eventual.