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:
learn.microsoft.com/en-us/azu...
learn.microsoft.com/en-us/azu...
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Пікірлер: 14
Great content and balance between concepts and practical example!
@arslanov1886
14 күн бұрын
Thank you. Glad it helped🙂
Thanks for this. At last I understood AG. I have never seen this kind of detailed video for AG internals. This is very good channel for internals :)
Very useful information. Thanks a lot 🙏
@arslanov1886
7 ай бұрын
Most welcome 😊
cool explanation.. thanks!!🙂
@arslanov1886
10 ай бұрын
Glad it was helpful!
Good session mate..please make the videos of basic troubleshooting in AOAG..thank you 🙂
@arslanov1886
Жыл бұрын
Sure mate. Thanks for suggestions
when we create windows failover cluster for SQL AG, do we need to have quorum disk / file witness? what is the best practice for the same.
@arslanov1886
10 ай бұрын
yes, you should create quorum witness as best practice. If you do not have quorum witness, there will be 50% probability that your whole cluster fails when one node goes down. Please refer below official doc: learn.microsoft.com/en-us/azure-stack/hci/concepts/quorum#examples
@riazkm9136
10 ай бұрын
@@arslanov1886thank you very much for the prompt and detailed reply. our environment is on a vxrail. what will be the best witness to use? will a file share witness created on a nas storage work. have you got any good videos for configuring the windows failover cluster. if yes, please share.
@arslanov1886
9 ай бұрын
As long as you have a constant and stable network between your servers and witness, you can choose any type of witness. There are other small points. Please refer below: learn.microsoft.com/en-us/windows-server/failover-clustering/manage-cluster-quorum#witness-configuration Please make sure that the witness is in another server. I do not have videoes but I would follow the below good docs: Step 1 learn.microsoft.com/en-us/azure/azure-sql/virtual-machines/windows/failover-cluster-instance-prepare-vm?view=azuresql&tabs=single-subnet Step 2 learn.microsoft.com/en-us/azure/azure-sql/virtual-machines/windows/failover-cluster-instance-azure-shared-disks-manually-configure?view=azuresql