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Imagine you have the following scenario:
How the connection string should be?
I can think on two options:
Data Source.Data Source and secondary replica as the Failover Partner
Which one should I use to get high availability and automatic failover? Other options?
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After creating the Availability Group, you can configure the listener from Availability Groups -> Group Name -> Add Listener. Either in the create an availability group listener or the New Availability Group Listener wizards, specify the Listener DNS Name, Port, and Network Mode values.
In Solution Explorer, double-click the My Project icon (Visual Basic) or Properties icon (C#) to open the Project Designer. Select the Settings tab. Enter a Name for the connection string. Refer to this name when accessing the connection string in code.
In SQL Server Configuration Manager, click SQL Server Services, right-click SQL Server (<instance name>), where <instance name> is the name of a local server instance for which you want to enable Always On Availability Groups, and click Properties. Select the Always On High Availability tab.
In SQL Listener, we have two virtual IP address mapped with a SQL Listener name. Step 1: Once the application tries to connect to the database using a SQL listener, it connects with DNS and asks for the IP address of it.
By the book is always to use the AG listener. I guess at the moment your connection string looks something like this:
Data Source=myServerAddress;Failover Partner=myMirrorServerAddress;
Initial Catalog=myDataBase;Integrated Security=True;
But if you successfully created an AG group, then change the connection string to use the AG listener, it would look something like this:
Server=tcp:MyAgListener,1433;Database=Db1;IntegratedSecurity=SSPI;
MultiSubnetFailover=True
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