Editor's note (May 2026): This article was published in the Azure Cosmos DB Dev Blog before the launch of the dedicated Azure DocumentDB Dev Blog. Azure DocumentDB now has its own home for product announcements, engineering insights, migration guidance, technical deep dives, and developer tutorials. If you're building with Azure DocumentDB or the o...

After a successful public preview, we’re excited to announce the General Availability (GA) of online migration from RU-based Azure Cosmos DB for MongoDB to Azure DocumentDB (with MongoDB compatibility). This capability makes migration fast, simple, and cost-free—all through the Azure portal. Why This Matters If you’re running workloads on RU-base...

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...

MongoDB is a popular document database that offers high performance, scalability, and flexibility. Many organizations use MongoDB to store and process large volumes of data for various applications. However, managing and maintaining MongoDB clusters can be challenging and costly, especially as the data grows and the demand increases.  Azure ...

We’re thrilled to announce a significant enhancement to the Azure Cosmos DB Migration for MongoDB extension! Now, you can seamlessly migrate your MongoDB workloads to vCore-based Azure Cosmos DB for MongoDB with the added convenience of online migration capability. Let’s dive into the details. What Is the Azure Cosmos DB Migration for MongoDB Exte...

Over the past couple of years, we have collaborated with numerous customers to tackle performance, scaling, and cost issues that arise when transitioning their Azure Cosmos DB for NoSQL API based applications to production. In many cases, these challenges stem from a lack of understanding of key Azure Cosmos DB concepts. To address this, We tea...

Introduction Azure Cosmos DB is Microsoft's premier fully managed NoSQL database for modern app development. It is ideal for solutions including artificial intelligence, digital commerce, Internet of Things, booking management and other types of use cases. It offers single-digit millisecond response times, automatic and instant scalability along w...

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...

As more and more businesses are moving their applications to the cloud or looking for improvements in their cloud applications, they are faced with the challenge of choosing the right database solution for their needs. For those who are currently using MongoDB, Azure Cosmos DB for MongoDB is an attractive option. Azure Cosmos DB offers two types...

"Cosmos DB is the go-to database powering the world’s most demanding workloads at any scale. OpenAI relies on Cosmos DB to dynamically scale their ChatGPT service – one of the fastest-growing consumer apps ever – enabling high reliability and low maintenance." - Satya Nadella, Microsoft chairman and chief executive officer   As the ne...