Azure DocumentDB Blog
News and technical insights from the Azure DocumentDB team
Latest posts
Join the Azure DocumentDB team at Microsoft Ignite 2026 in San Francisco!
Microsoft Ignite 2026 is just around the corner! From November 17–20, the Azure DocumentDB team will be in San Francisco, and we're excited to connect with developers, architects, and database professionals from around the world. We're especially looking forward to our breakout session, Migrate and modernize MongoDB applications with Azure DocumentDB (BRK375). In this session, we'll explore how to migrate existing MongoDB applications to Azure DocumentDB while minimizing migration risks and disruption. We'll walk through the migration journey - from assessing compatibility and moving data to validating appl...
Modernize MongoDB applications with Azure DocumentDB: From assessment to what’s next
Migrating an existing MongoDB application shouldn't mean starting over. The application code, data models, APIs, and integrations you've already built represent years of investment. The challenge is moving forward while preserving what works. For many organizations, modernization is about more than moving a database to the cloud. It's an opportunity to simplify operations, optimize costs, build on open-source technologies, and prepare applications for new requirements, including AI-powered experiences. Azure DocumentDB provides a path forward. Microsoft's fully managed, MongoDB-compatible database service i...
Build offline-first apps with Azure DocumentDB and PowerSync
Modern applications often need to work in places where network connectivity is slow, intermittent, or unavailable. Field service, retail, logistics, healthcare, and mobile SaaS applications are common examples. PowerSync recently introduced alpha support for Azure DocumentDB, giving developers a way to combine Azure DocumentDB as the cloud operational database with local SQLite databases on client devices. Applications can remain responsive and continue working offline while PowerSync synchronizes relevant data in the background. Note: PowerSync support for Azure DocumentDB is currently an alpha release. Be...
Query Performance Tuning in Azure DocumentDB: A Practical Guide
Writing a query that works is easy. Writing a query that scales is a different story. As collections grow to millions of documents, queries that returned results in milliseconds during development start taking seconds or timing out entirely. The root cause is almost always the same: the database is doing far more work than it needs to. In this post, we’ll take a single, realistic query and walk through the full optimization process: running explain() to understand what’s happening under the hood, building indexes step by step, and applying the ESR rule to design a compound index that eliminates wasted scans and...
How a Large Enterprise Migrated 47 TB and 7,000+ Collections to Azure DocumentDB in Under 48 Hours
Large database migrations are where good planning either pays off or falls apart. In a MongoDB-compatible estate with thousands of collections, the hard part is not only moving data. It is deciding what to move, what to defer, how to sequence the work, and how to keep the system stable while ingestion is running at full speed. That is exactly what we saw in a recent large enterprise migration to Azure DocumentDB: 47 TB of data, 7,000+ collections, a 27-node source footprint, and a production cutover window of less than 48 hours. The target was intentionally smaller and simpler: a 3-node, 16 TB Azure DocumentDB...
Azure DocumentDB – General Availability of Service-Managed Failovers
We are excited to announce the general availability of service-managed failovers in Azure DocumentDB, eliminating the need for human intervention to recover from a regional outage. Running a production database means planning for the unlikely. Regional outages are rare, but when they happen, every second lost can have significant business impact. Previously, protecting against a region-wide failure in Azure DocumentDB required user-initiated actions - starting with monitoring availability and then making a judgment call based on the criticality of the application. Eventually culminating in manually promoting a...
Instant Free Tier Clusters in Azure DocumentDB
Feedback from developers using Azure DocumentDB consistently pointed to one small but still impactful item on their wish list: provisioning a free tier cluster took a few minutes. For a developer just getting started, or an agentic workflow spinning up ephemeral clusters to validate a solution, those minutes are vital. Today, that wait is effectively gone. Free tier cluster provisioning on Azure DocumentDB is now a near-instant operation. What Changed We've made optimizations to the free tier provisioning path. What previously took a few minutes now completes in seconds, with no changes to feature com...
Change Streams in Azure DocumentDB: Richer Events, Historical Replay, and Multi-Node Change Streams (Public Preview)
Real-time, event-driven applications are now the expectation, not the exception. Teams want dashboards that update the instant something happens, microservices that react the moment data lands, and pipelines that move changes downstream without polling a database on a timer. Since Change Streams reached General Availability in Azure DocumentDB, that pattern has been production-ready and the feature has kept getting better. Here’s a quick tour of what’s new since GA, with the headline being three of the most requested capabilities: richer change events, historical replay, and Multi-Node Change Streams, now in Pub...
Graceful Failovers in Azure DocumentDB – Now Generally Available
We are excited to announce the general availability of graceful failovers in Azure DocumentDB. Not every region switch is because of availability loss. Whether you're migrating your primary workload to a different Azure region or proactively moving ahead of a forecasted application-level upgrade, you need a failover mechanism that prioritizes data integrity over speed. One that lets you move deliberately, not reactively. With Graceful Failover, you initiate a controlled promotion of your replica cluster to read-write and the service guarantees that every write committed on the primary is replicated before t...
