W6 Azure Cosmos DB in depth

Who it is for

For developers who have to use, run or review Cosmos DB in an application and know lesson 3.6.4 from K3.

Prerequisites

K3 (lesson 3.6.4, managed identity, Bicep, monitoring) and K2 (C#, web API) or equivalent experience. The AI track helps for module W6.4. You need an Azure account only for the optional steps; the exercises have a part without an account. The exam allows C# or Python: the course teaches C#.

Afterward, you can

• Choose resource model, throughput and partition keys from access patterns and justify them with numbers
• Query, write, patch, batch and process the change feed with the .NET SDK
• Assess indexing policies and queries by consumption
• Secure an account without keys, plan regions and recovery and observe operation
• Build vector, full-text and hybrid search and a memory store for agents
• Review a foreign model for anti-patterns

Contents

1. W6.1

   Models, throughput and partitions

   resource model, request units, SDK client, embedding or referencing, partition keys

   6 h
2. W6.2

   Working with data

   queries and paging, writes, patch, TTL, concurrency, bulk and batch, indexing, change feed

   7 h
3. W6.3

   Secure, available, observed

   sign-in and rights, network, masking, regions, recovery, metrics, logs, fleet

   5 h
4. W6.4

   AI and analytics

   vector and full-text search, hybrid search and RAG, memory for agents, Microsoft Fabric, AI-assisted tools

   7 h
5. W6.5

   Wrap-up

   reviewing a design for anti-patterns, module exam

   3 h

About 28 hours in all (indicative).

Lessons

You see the text and video of every lesson here on the site after buying the course; the titles and goals are already shown. A self-study course: you work through the lessons in order and check your exercises yourself against the solutions.

You can read the first module (W6.1) for free, with text and video, without signing in: so you see how the course works before you buy.

The lessons stand under their modules, in the order of the course. Click a module to open or close its lessons.

Final project: the Kladde

Certifications

An offer, never a requirement: these Microsoft exams fit this stage. You take them at Microsoft; we are not a Microsoft training partner.

• DP-420 Azure Cosmos DB AI Developer Associate

  Expects C# or Python experience.

The course follows the topics Microsoft lists for exam DP-420 (the version of the skills list dated October 6, 2026, read on Microsoft Learn on November 12, 2026; the certification has since been called Azure Cosmos DB AI Developer Associate) and replaces neither Microsoft's material nor exam preparation. You take the exam with Microsoft; registration, price and dates are there.

Keep learning with Microsoft Learn

Microsoft's learning paths and documentation that go with this course.

• Study guide for Exam DP-420: Building AI Applications with Azure Cosmos DB
• Microsoft Certified: Azure Cosmos DB AI Developer Associate
• Azure Cosmos DB documentation
• Partitioning and horizontal scaling in Azure Cosmos DB