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How do you check a read-only routing?
To test read-only routing using SQLCMD, use –K ReadOnly parameter that shows secondary replica receiving read connections as per the routing list.
What is read-only routing in always on?
readable secondary replica
Read-only routing refers to the ability of SQL Server to route qualifying read-only connection requests to an available Always On readable secondary replica (that is, a replica that is configured to allow read-only workloads when running under the secondary role).
What happens when the applicationintent value is not included in the connection string?
Specifically, if the ApplicationIntent value is ReadWrite (the default value), the connection will be directed to the read-write replica. This is identical to the behavior when ApplicationIntent is not included in the connection string. If the ApplicationIntent value is ReadOnly, the connection is routed to a read-only replica.
How to specify the application intent connection property?
You can specify the Application Intent connection property when connecting to SQL Server via SQLClient, SNAC ODBC or SNAC OLEDB. The SNAC provider must be installed where your client application runs. SNAC version 11 (sqlncli11.dll) supports the Application Intent connection property.
What happens when application intent is not used?
If it is, the application intent property will be ignored and the connection will be directed to the primary. The following sample code demonstrates that if the legacy ODBC or SQL OLE DB drivers are used, application intent is not utilized and your application will be connected to the primary replica.
What happens if you run a read only query on a replica?
If such a query were to run for a long time, it would cause the read-only replica to be significantly out of sync with the primary replica. If a long-running query on a read-only replica causes this kind of blocking, it will be automatically terminated.