Availability Group Changes

Allan Hirt digs into SQL Server 2016 Availability Group changes:

What is a distributed availability group? Distributed availability groups allows you to create two different AGs on different Windows Server failover clusters (WSFCs) but join them together – if you will, an AG of AGs. This is great for disaster recovery scenarios where you do not want to worry (more than you should) about things like voters and quorum in a  single WSFC which could make the configuration more complex. This also allows for different versions of Windows Server (one WSFC is Windows Server 2012 R2 and another Windows Server 2016). Heck, it could even facilitate migrations to new hardware/the public cloud/virtualization assuming the same major version of SQL Server. It’s a cool feature. You can only manually fail over the AG between the WSFCs, but that’s OK, and you do need a listener for each AG. If you do not plan on using a listener, you cannot create a distributed AG.

Side note:  when I read DAG, I think directed acyclical graph.  Maybe I’m just weird that way…

Main note:  the idea of “seeding” an Availability Group sounds wonderful.

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Availability Group Latency Reports

Sourabh Agarwal points out some new reports in Management Studio 17.4: The Latency data collection functionality and the associated reports allows a database administrator to quickly discern the bottleneck in the log transport flow between the Primary and the Secondary replicas of an Availability Group. This feature does NOT answer the question “Is there latency […]

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Configuring And Monitoring Distributed AGs

Tracy Boggiano has some advice on configuring and monitoring distributed Availability Groups: Monitoring can be tricky with distributed AGs because of the way it shows up in SSMS.  The distributed AG created on the primary AG does not have the ability to show you a dashboard to monitor traffic like the typical AG and the secondary […]

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