The answer is Azure Database for PostgreSQL, the fully managed relational database service that provides native PostgreSQL compatibility without the operational overhead of self-managed infrastructure. This service is correct because it handles critical database administration tasks like automated patching, high availability, and point-in-time backups while preserving the full open-source PostgreSQL engine, allowing you to use familiar tools and extensions. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of Azure’s platform-as-a-service database offerings, often appearing alongside comparisons to Azure SQL Database or Azure Cosmos DB. A common trap is confusing Azure Database for PostgreSQL with a simple virtual machine running PostgreSQL, but the key distinction is the “fully managed” label—Azure handles the underlying hardware, OS, and database engine maintenance. For a quick memory tip, think “PostgreSQL = open-source, managed = no server chores,” and remember that the service name directly matches the exam’s phrasing: “Azure Database for PostgreSQL.”
AZ-900 Describe Azure architecture and services Practice Question
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 a managed relational database compatible with PostgreSQL?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Database for PostgreSQL
Azure Database for PostgreSQL is a fully managed, enterprise-ready relational database service built on the open-source PostgreSQL engine. It provides built-in high availability, automated backups, and scaling, making it the correct choice for a managed PostgreSQL-compatible database in Azure.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
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 uses the Microsoft SQL Server engine, not PostgreSQL.
✓
Azure Database for PostgreSQL
Why this is correct
Azure Database for PostgreSQL is the fully managed service for open-source PostgreSQL workloads.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Cosmos DB for PostgreSQL
Why it's wrong here
Cosmos DB for PostgreSQL (formerly Citus) is a distributed version; Azure Database for PostgreSQL is the standard managed offering.
✗
Azure Database for MariaDB
Why it's wrong here
Azure Database for MariaDB uses the MariaDB engine, not PostgreSQL.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Azure Cosmos DB for PostgreSQL (a distributed, sharded database) with the standard managed Azure Database for PostgreSQL, leading candidates to select the Cosmos DB option when the question asks for a managed relational database compatible with PostgreSQL.
Detailed technical explanation
How to think about this question
Azure Database for PostgreSQL offers two deployment modes: Single Server and Flexible Server. Flexible Server provides more control over compute and storage, zone-redundant high availability, and a fully managed experience with up to 99.99% SLA. Under the hood, it uses the same PostgreSQL wire protocol (port 5432) and supports extensions like PostGIS and pg_stat_statements, enabling seamless migration from on-premises PostgreSQL instances.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Database for PostgreSQL — Azure Database for PostgreSQL is a fully managed, enterprise-ready relational database service built on the open-source PostgreSQL engine. It provides built-in high availability, automated backups, and scaling, making it the correct choice for a managed PostgreSQL-compatible database in Azure.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which Azure service provides managed relational database compatible with open-source PostgreSQL?
easy
A.Azure SQL Managed Instance
✓ B.Azure Database for PostgreSQL
C.Azure Cosmos DB for PostgreSQL
D.Azure SQL Database Hyperscale
Why B: Azure Database for PostgreSQL is a fully managed relational database service specifically built for PostgreSQL, providing high availability, automated backups, and built-in security. It is the correct choice because it directly offers a managed PostgreSQL-compatible database without requiring any middleware or translation layer.
Last reviewed: Jun 11, 2026
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