Azure Cosmos DB Blog
The latest news, updates and technical insights from the Azure Cosmos DB team
Latest posts
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...
Accelerating MongoDB Development on Azure: What’s New at Microsoft Build 2025
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. Microsoft Build 2025 is underway in Seattle, bringing developers together to shape the future of cloud-native app development. If you buil...
New Generally Available and Preview Search Capabilities in Azure Cosmos DB for NoSQL
At Microsoft Build 2025, we're excited to announce general availability of search capabilities for Azure Cosmos DB, including full-text and hybrid search, enabling developers to build highly performant, scalable, and intelligent applications. We're also introducing new preview enhancements such as multi-language support and fuzzy search, further enriching search accuracy and flexibility across the globe. To streamline developer productivity, we're announcing improved developer tooling, featuring Entity Framework integration and robust LINQ support for Azure Cosmos DB search capabilities. Additionally, Filtered Ve...
What’s new in Azure Cosmos DB for NoSQL at Microsoft Build 2025
Building modern, scalable applications often comes with the challenge of managing and scaling your database infrastructure. That’s exactly why we built Azure Cosmos DB – to provide a fast, flexible NoSQL database service that frees you from the operational heavy lifting. With automatic scaling, built-in high availability, and consistent single-digit millisecond performance at any scale, Azure Cosmos DB lets you focus on innovating rather than database administration. Today, at the Microsoft Build 2025 conference, we're excited to announce powerful new features to Azure Cosmos DB aligned to four key investm...
Boost Query Performance with Global Secondary Indexes in Azure Cosmos DB
Global secondary indexes for Azure Cosmos DB—now in Public Preview—make it easier to query data efficiently, especially as your datasets grow. Distributed databases like Azure Cosmos DB scale with dataset growth by partitioning data across multiple physical machines. When your queries include the partition key, the client routes them directly to the appropriate partition. Queries that include the partition key remain low-latency regardless of how many partitions exist. But in real-world applications, or in the case of AI apps and agents, you often need to query data without including the partition key. Th...