Document database

Azure Cosmos DB

Globally distributed, multi-API database on Azure.

Microsoft's managed NoSQL service with turnkey multi-region replication, five tunable consistency levels, and APIs for NoSQL documents, MongoDB, Cassandra, Gremlin and Table, plus a distributed PostgreSQL option.

Data model: Document
Vendor: Microsoft
License: Commercial (managed service; free tier)
Articles: 1

Azure Cosmos DBIntermediate

Why does Azure Cosmos DB return 429 "Request rate is too large"?

Throttled at 30% usage? Throughput is split across physical partitions, so one hot partition key throttles alone. Diagnose it, then fix keys, RU costs and scaling.

#data-modeling#performance#troubleshooting

Tanishk · 8 min

Oct 26, 2026