Build practical High Availability (HA) and Disaster Recovery (DR) solutions using SQL Server 2025 Always On Availability Groups.
This repository is created as a public introduction and reference page for my Udemy course:
👉 SQL Server 2025: Build Always On HA & DR Solutions 🔗 https://www.udemy.com/course/sqlserverag/?referralCode=2E28F5CFD4DFBAD4EC15
In production database environments, running backups is not enough.
A real SQL Server HA/DR strategy requires proper architecture, failover planning, application connectivity, monitoring, backup validation, and recovery testing.
This course helps you build a practical SQL Server 2025 Always On lab environment from the ground up. You will learn how to configure Windows Server, Active Directory, DNS, Windows Server Failover Cluster, SQL Server 2025, Availability Groups, AG Listener, failover scenarios, read-only routing, monitoring, backup, restore, and disaster recovery patterns.
The goal is not only to install SQL Server Always On, but to understand how it works in a realistic HA/DR environment.
By the end of this course, you will be able to:
- Design a SQL Server 2025 HA/DR lab environment
- Set up Windows Server 2025, Active Directory, DNS, and networking
- Configure Windows Server Failover Cluster
- Install and configure SQL Server 2025
- Enable Always On Availability Groups
- Create and test an Availability Group
- Configure an AG Listener for application connectivity
- Test failover scenarios
- Configure synchronous and asynchronous commit modes
- Implement read-only routing
- Connect an ASP.NET Core application to SQL Server Always On
- Monitor AG health using dashboards, DMVs, SQL Agent, and PowerShell
- Configure AG-aware backup strategies
- Restore and rejoin databases to an Availability Group
- Combine Log Shipping and Always On AG for disaster recovery scenarios
Learn the core concepts of SQL Server high availability, disaster recovery, Always On Availability Groups, Failover Cluster Instance, and Log Shipping.
Build the full lab environment step by step, including Windows Server 2025, Active Directory, DNS, Windows Server Failover Cluster, SQL Server 2025, Availability Groups, AG Listener, failover testing, synchronization modes, and read-only routing.
Understand how applications connect to an AG Listener and how read-write and read-only routing can be tested using ASP.NET Core.
Learn how to monitor Availability Group health using dashboards, Dynamic Management Views, SQL Agent alerts, Database Mail, and PowerShell-based health check reports.
Explore practical backup and restore scenarios in SQL Server Always On, including preferred backup replica, backup from primary and secondary replicas, AG-aware backup automation, restore and rejoin operations, log file growth handling, and Log Shipping integration for DR.
Many teams assume that SQL Server backups are enough for disaster recovery.
But in a real incident, the important questions are different:
- Can the database fail over successfully?
- Can the application reconnect through the AG Listener?
- Can the team detect synchronization issues early?
- Can backups be restored within the expected recovery time?
- Can the business continue operating after a failure?
This course helps you understand these questions through a practical, hands-on SQL Server 2025 lab.
This course is suitable for:
- SQL Server DBAs
- Database administrators
- System administrators
- Backend developers
- DevOps engineers
- Cloud and infrastructure engineers
- IT professionals responsible for database availability
- Anyone who wants to learn SQL Server Always On in a practical way
This GitHub repository does not contain the full course source code or lab files.
The complete hands-on materials, step-by-step demonstrations, configuration walkthroughs, source code examples, and lab explanations are provided inside the Udemy course.
You can access the full course here:
👉 https://www.udemy.com/course/sqlserverag/?referralCode=2E28F5CFD4DFBAD4EC15
If you want to build and understand SQL Server 2025 Always On HA/DR solutions through a practical lab, you can join the course here:
🎓 SQL Server 2025: Build Always On HA & DR Solutions 🔗 https://www.udemy.com/course/sqlserverag/?referralCode=2E28F5CFD4DFBAD4EC15
https://www.udemy.com/course/sqlserverag/?referralCode=2E28F5CFD4DFBAD4EC15