Azure Cosmos DB

 

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

Features

• 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.
• 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 Prefix – updates that are returned will contain some prefix of all the updates.
• Eventual – has no ordering guarantee for reads.

Security

• 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.

Pricing

• 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.