Cosmos DB

Azure Cosmos DB is a fully managed, globally distributed multi-model database (NoSQL, MongoDB, PostgreSQL) with guaranteed single-digit millisecond latency and 99.999% SLA-backed availability.

This is your mission-critical database: Azure Cosmos DB delivers guaranteed single-digit millisecond response times and 99.999% availability, all backed by comprehensive SLAs. It offers instant, elastic scalability for both storage and throughput via automatic horizontal partitioning. Developers get maximum flexibility, leveraging multi-model support through open-source APIs (including NoSQL, MongoDB, PostgreSQL, and Apache Cassandra) to build high-performance, cloud-native applications that require turnkey global distribution.

https://azure.microsoft.com/en-us/products/cosmos-db/