Which is the distributed network name in SQL Server?
The distributed network name (DNN) replaces the virtual network name (VNN) as the connection point when used with an Always On failover cluster instance on SQL Server VMs. This negates the need for an Azure Load Balancer routing traffic to the VNN, simplifying deployment, maintenance, and improving failover.
Is the DNN feature available on SQL Server 2019?
The DNN feature is currently only available on SQL Server 2019 CU2 and later on Windows Server 2016 and later. For an alternative connectivity option, consider a virtual network name and Azure Load Balancer instead.
Can you use a DNN listener with SQL Server?
As such, when using the distributed network name (DNN) listener with your Always On availability group and SQL Server on Azure VMs, there may be some additional considerations. This article details SQL Server features and interoperability with the availability group DNN listener.
How to set DNN for SQL server failover cluster?
Clients use the DNS name to connect to the SQL Server FCI. You can choose a unique value. Or, if you already have an existing FCI and don’t want to update client connection strings, you can configure the DNN to use the current VNN that clients are already using. To do so, you need to rename the VNN before setting the DNN in DNS.
Where to find DNN resource in SQL Server FCI?
By default, the cluster binds the DNN DNS name to all the nodes in the cluster. However, nodes in the cluster that are not part of the SQL Server FCI should be excluded from the list of DNN possible owners. To update possible owners, follow these steps: Go to your DNN resource in Failover Cluster Manager.
What does Windows server failover cluster mean for SQL Server?
Applies to: SQL Server (all supported versions) A Windows Server Failover Cluster (WSFC) is a group of independent servers that work together to increase the availability of applications and services. SQL Server takes advantage of WSFC services and capabilities to support Always On availability groups and SQL Server Failover Cluster Instances.
How to configure DNN for failover cluster instance?
Configured your failover cluster instances. Installed the latest version of PowerShell. The client connecting to the DNN listener must support the MultiSubnetFailover=True parameter in the connection string. The DNN resource is created in the same cluster group as the SQL Server FCI.