Azure Cosmos DB Blog
The latest news, updates and technical insights from the Azure Cosmos DB team
Latest posts
Now Available: Migrate from RU to vCore for Azure Cosmos DB for MongoDB via Azure Portal
We are thrilled to introduce a cost-effective, simple, and efficient solution for migrating from RU-based Azure Cosmos DB for MongoDB to vCore-based. You can now move to vCore-based Azure Cosmos DB for MongoDB at no cost using the Azure portal. How is the vCore model different? Azure Cosmos DB offers two pricing models: Request Units (RU) and vCore. The RU-based model ensures dynamic pricing based on throughput consumption, allowing dynamic scaling and optimized performance. With higher scale-out elasticity, top-end scalability, and consistent availability, RU-based provisioning works best for workloads with...
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
We’re excited to announce the general availability (GA) of Change Streams for Azure Cosmos DB for MongoDB (vCore)—empowering developers to build real-time, event-driven applications with ease and scale. With Change Streams now in GA, your applications can react instantly to data changes in the database, enabling low-latency use cases such as live dashboards, alerting systems, and reactive microservices. Whether you're building IoT platforms, order processing systems, or collaborative applications, Change Streams provides the foundation for responsive, modern architectures.  Key Capabilities Now Availab...
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...
Accelerating MongoDB Development on Azure: What’s New at Microsoft Build 2025
Microsoft Build 2025 is underway in Seattle, bringing developers together to shape the future of cloud-native app development. If you build MongoDB workloads in Azure, this year’s updates give you even more tools to accelerate development. We’ve streamlined how you build and modernize MongoDB applications in the cloud with our managed service- vCore-based Azure Cosmos DB for MongoDB- powered by DocumentDB, our fully open-source, MongoDB-compatible, multi-cloud engine. Whether you're driving real-time workloads, creating AI-powered chatbots, or scaling mission-critical applications, here’s everything new for M...