Always on Availability group (AG) cluster in SQL Server

In this video, I am going to introduce the concepts of Always On availability groups that are central for configuring and managing this type of cluster.
At first, I will show you why AG is needed and created, how it functions at high level. Afterwards, we will dive more deeply into internals of AG and I will show you in very much detailed way how AG works internally.
If you are building, troubleshooting or trying to understand AG cluster you find this video very useful.

Chapters
0:00 - Introduction
0:38 - Why AG is needed?
1:46 - Important features and concepts of AG: primary/secondary replica, listener, WSFC, data sync etc.
10:37 - Synchronization commit modes: Asynchronous-commit and synchronous-commit
14:05 - Internals of AG
21:24 - Disaster recovery solution: Manual, automatic and forced manual failovers
31:27 - Summary

Useful documentations on building multi region and multi subnet AG cluster:
https://learn.microsoft.com/en-us/azu...
https://learn.microsoft.com/en-us/azu...

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