Azure Cosmos DB Blog
The latest news, updates and technical insights from the Azure Cosmos DB team
Latest posts
Now in Public Preview: Azure Functions Trigger for Azure Cosmos DB for MongoDB vCore
Editor's note (November 2025): Azure Cosmos DB for MongoDB (vCore) has been renamed to Azure DocumentDB. This article was originally published before the rename, so it uses the product name that was current at the time. While the product name has changed, the technical concepts discussed in this article remain applicable unless otherwise noted. For the latest Azure DocumentDB announcements, features, and technical guidance, visit the Azure DocumentDB Dev Blog. The Azure Cosmos DB trigger for Azure Functions is now in public preview—available for C# Azure Functions using Azure Cosmos DB for MongoDB vCore! Th...
Now Available: Migrate from RU to vCore for Azure Cosmos DB for MongoDB via Azure Portal
Editor's note (November 2025): Azure Cosmos DB for MongoDB (vCore) has been renamed to Azure DocumentDB. This article was originally published before the rename, so it uses the product name that was current at the time. While the product name has changed, the technical concepts discussed in this article remain applicable unless otherwise noted. For the latest Azure DocumentDB announcements, features, and technical guidance, visit the Azure DocumentDB Dev Blog. We are thrilled to introduce a cost-effective, simple, and efficient solution for migrating from RU-based Azure Cosmos DB for MongoDB to Azure DocumentD...
Generally Available: Seamless Migration from Serverless to Provisioned Throughput in Azure Cosmos DB
We are excited to announce the general availability (GA) of a highly requested capability in Azure Cosmos DB: the ability to migrate from serverless to provisioned throughput mode—without manual recreation, or downtime. This release builds on the momentum of our public preview and is now fully supported across all regions. Why it matters Azure Cosmos DB offers two powerful capacity modes designed to match your application's scale and usage patterns: With this new capability, you can now start with serverless—avoiding the need to estimate or configure throughput early—and transition seamlessly to...
Public Preview: Shape and Control Workloads with Throughput Buckets in Azure Cosmos DB
Imagine your application is processing customer checkouts in real-time, while a background process synchronizes data for reporting. Suddenly, the seamless user experience falters because the sync job consumes more RU/s than anticipated. Many teams face a common challenge: multiple workloads share the same container resources, yet each has different performance requirements. We're excited to introduce the public preview of Throughput Buckets in Azure Cosmos DB for NoSQL—a new solution designed to address this challenge. Introducing Throughput Buckets Throughput Buckets allow you to set a maximum RU/s c...
Microsoft Entra ID integration with Azure Cosmos DB for MongoDB (vCore)
Security is no longer a nice-to-have—it’s a foundational requirement for any cloud-native architecture. As organizations adopt managed database services to support mission-critical applications, they must prioritize robust, scalable, and centralized security. Azure Cosmos DB for MongoDB (vCore) delivers high performance and flexibility, but it provides the most value when paired with well-implemented security practices. Authentication anchors any effective security strategy. It verifies that only authorized users and applications can access your data and serves as the first line of defense against unauthorized...
DiskANN and Filtered Vector Search are Now Generally Available in Azure Cosmos DB for MongoDB (vCore)
We’re excited to announce general availability of DiskANN and Filtered Vector Search on Azure Cosmos DB for MongoDB (vCore), starting with M30 cluster tiers and above. You can now use these features in production to store and query vector embeddings directly alongside your operational data—efficiently and in one integrated vector database. DiskANN Indexing: Scaling Vector Search to Massive Datasets Efficient vector indexing is critical for AI applications that process large-scale datasets. While HNSW and IVF each offer advantages, we recommend DiskANN for datasets with more than 1 million documents. Dis...
Now in Preview: Azure Cosmos DB Fleets
We’re excited to announce the preview of Azure Cosmos DB fleets. Azure Cosmos DB fleets address common challenges that developers face when building and managing multi-tenant or Software as a Service (SaaS) applications. Today, many SaaS providers using Azure Cosmos DB isolate each tenant in a separate database account to meet strict performance and security requirements—for example, supporting customer-managed keys. While this approach ensures tenant isolation, it creates operational complexity at scale. Managing thousands of RU/s settings becomes difficult, and provisioning dedicated capacity for every te...
General Availability of Change Streams in vCore-Based Azure Cosmos DB for MongoDB
Editor's note (November 2025): Azure Cosmos DB for MongoDB (vCore) has been renamed to Azure DocumentDB. This article was originally published before the rename, so it uses the product name that was current at the time. While the product name has changed, the technical concepts discussed in this article remain applicable unless otherwise noted. For the latest Azure DocumentDB announcements, features, and technical guidance, visit the Azure DocumentDB Dev Blog. We’re excited to announce the general availability (GA) of Change Streams for Azure Cosmos DB for MongoDB (vCore)—empowering developers to build real-ti...
Announced at Build 2025: Foundry connection for Azure Cosmos DB, Global Secondary Index, full-text search, and more
The countdown to innovation has begun: Day 1 of Microsoft Build 2025 bought several new announcements, demos, and live coding sessions to in-person and online audiences, showcasing the potential of cloud-native and AI-driven applications. Azure Cosmos DB is at the forefront of this innovation. From powering multi-agent applications and unlocking high-speed analytics to delivering new features designed for faster and easier app development, we highlighted once again why Azure Cosmos DB is the go-to database for developers building at the edge of what’s possible. Here’s a look at what we announced today and Day...