Quick Answer
The answer is Azure Cosmos DB for Gremlin, which is the correct choice because it delivers a fully managed, enterprise-grade graph database service that models data as vertices and edges, allowing you to run complex relationship queries using the Apache TinkerPop Gremlin traversal language. This service handles global distribution, automatic indexing, and multi-region writes with SLA-backed performance, making it the go-to Azure graph database service for connected data scenarios like social networks or recommendation engines. On the AZ-900 exam, this question tests your understanding of Azure’s purpose-built database offerings—specifically how Cosmos DB supports multiple data models, with Gremlin being the graph API. A common trap is confusing it with Azure SQL Database or Azure Database for PostgreSQL, which are relational, not graph-based. For a quick memory tip: think “Gremlin for Graphs” to link the Gremlin API directly to graph database needs.
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which Azure service provides an enterprise-grade, fully managed graph database as a service?
Azure SQL Database
Why wrong: Azure SQL Database is a relational database, not a graph database.
Azure Cosmos DB for Gremlin
Cosmos DB for Gremlin is Azure's fully managed graph database service using the Apache TinkerPop standard.
Azure Table Storage
Why wrong: Azure Table Storage is a key-value NoSQL store, not a graph database.
Azure Cache for Redis
Why wrong: Azure Cache for Redis is an in-memory caching service, not a graph database.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Cosmos DB for Gremlin
Azure Cosmos DB for Gremlin is the correct answer because it provides a fully managed, enterprise-grade graph database service that uses the Apache TinkerPop Gremlin graph traversal language. It supports graph data models with vertices and edges, enabling complex relationship queries at global scale with turnkey distribution and SLA-backed performance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Azure SQL Database
Why it's wrong here
Azure SQL Database is a relational database, not a graph database.
Azure Cosmos DB for Gremlin
Why this is correct
Cosmos DB for Gremlin is Azure's fully managed graph database service using the Apache TinkerPop standard.
Related concept
Read the scenario before looking for a memorised answer.
Azure Table Storage
Why it's wrong here
Azure Table Storage is a key-value NoSQL store, not a graph database.
Azure Cache for Redis
Why it's wrong here
Azure Cache for Redis is an in-memory caching service, not a graph database.
Common exam traps
The trap here is that candidates may confuse Azure Cosmos DB's multiple APIs (e.g., SQL, MongoDB, Cassandra, Table, Gremlin) and incorrectly assume that Azure SQL Database or Azure Table Storage can handle graph workloads, when only the Gremlin API within Cosmos DB is purpose-built for graph databases.
Detailed technical explanation
Azure Cosmos DB for Gremlin implements the Apache TinkerPop graph computing framework, allowing users to model data as vertices (nodes) and edges (relationships) with properties. Under the hood, it stores graph data in a partitioned, horizontally scalable manner, and queries are executed using the Gremlin traversal language, which supports complex patterns like shortest path, recommendation engines, and social network analysis. A real-world scenario is a fraud detection system that traverses transaction relationships in real time, where Cosmos DB's multi-region writes and low-latency reads are critical.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Cosmos DB for Gremlin — Azure Cosmos DB for Gremlin is the correct answer because it provides a fully managed, enterprise-grade graph database service that uses the Apache TinkerPop Gremlin graph traversal language. It supports graph data models with vertices and edges, enabling complex relationship queries at global scale with turnkey distribution and SLA-backed performance.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This AZ-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-900 exam.
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