Azure Cosmos DB

  • Globally distributed database that supports NoSQL.
  • A fully-managed database service with turnkey global distribution and transparent multi-master replication.


  • Cosmos DB offers encryption at rest.
  • It replicates every partition across all the regions.
  • CosmosDB offers single-digit millisecond reads and writes in all regions.
  • Supports automatic failover during a regional outage.
  • Consistency Levels: Strong, Bounded Staleness, Session, Consistent Prefix, and Eventual
  • You can set either standard (manual) or autoscale provisioned throughput on your databases and containers.
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  • Monitor both the provisioned autoscale max RU/s and the current throughput (RU/s) of the system with Azure Monitor metrics.

Consistency Levels

  • Strong – reads are guaranteed to return the most recent committed version of an item.
  • Bounded Staleness – is for low write latencies but requires a total global order guarantee.
  • Session – reads are guaranteed to honor the consistent-prefix, monotonic reads, monotonic writes, read-your-writes, and write-follows-reads guarantees.
  • Consistent Prefixupdates that are returned will contain some prefix of all the updates.
  • Eventualhas no ordering guarantee for reads.


  • Encryption at rest is applied automatically.
  • Uses AES-256 encryption in all regions.
  • You can use the keys that are managed by Microsoft or customer-managed keys.
  • Two types of keys to authenticate users:
    • Master Keys for administrative resources.
    • Resources Tokens for application resources.
  • Detect suspicious activities which indicate unusual and potentially harmful attempts to access or exploit databases with Advanced Threat Protection.


  • Elastically scale the provisioned throughput and storage for your databases according to your needs and only pay for the throughput and storage needed.
  • Cosmos DB throughput per second and request unit consumption varies by operation and JSON document.
  • Additional backup copies will be billed as total GBs of data stored (first two copies are free).
  • You provision the number of RUs for your application on a per-second basis in increments of 100 RUs per second. You are billed on an hourly basis.
  • With autoscale for containers, you pay per hour for the highest RU/s that the system scaled up to within the hour.

Azure SQL Database vs Cosmos DB:

Technical Overview and Unique Features of Azure Cosmos DB


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