SQL Server Always On Series - Configure read-only routing for an Always On availability group

SQL Server Always On Series - Configure read-only routing for an Always On availability group #jbswiki #alwayson

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG1' WITH
(SECONDARY_ROLE (ALLOW_CONNECTIONS = READ_ONLY));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG1' WITH
(SECONDARY_ROLE (READ_ONLY_ROUTING_URL = N'TCP://JBSAG1.JBSWIKI.COM:1433'));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG2' WITH
(SECONDARY_ROLE (ALLOW_CONNECTIONS = READ_ONLY));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG2' WITH
(SECONDARY_ROLE (READ_ONLY_ROUTING_URL = N'TCP://JBSAG2.JBSWIKI.COM:1433'));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG3' WITH
(SECONDARY_ROLE (ALLOW_CONNECTIONS = READ_ONLY));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG3' WITH
(SECONDARY_ROLE (READ_ONLY_ROUTING_URL = N'TCP://JBSAG3.JBSWIKI.COM:1433'));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG1' WITH
(PRIMARY_ROLE (READ_ONLY_ROUTING_LIST=(('JBSAG3','JBSAG2'))));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG2' WITH
(PRIMARY_ROLE (READ_ONLY_ROUTING_LIST=(('JBSAG3','JBSAG1'))));

ALTER AVAILABILITY GROUP JBAG
MODIFY REPLICA ON
N'JBSAG3' WITH
(PRIMARY_ROLE (READ_ONLY_ROUTING_LIST=(('JBSAG2','JBSAG1'))))

Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : TCP Provider: No such host is known.
.
Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : Login timeout expired.
Sqlcmd: Error: Microsoft ODBC Driver 17 for SQL Server : A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online..

TITLE: Connect to Server
------------------------------
Cannot connect to JBSAPP.
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ADDITIONAL INFORMATION:

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - No such host is known.) (Microsoft SQL Server, Error: 11001)

------------------------------

No such host is known

------------------------------
BUTTONS:
OK
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TITLE: Connect to Server
------------------------------

Cannot connect to JBSAPP.

------------------------------
ADDITIONAL INFORMATION:

Keyword not supported: 'appliationintent'. (System.Data)

------------------------------
BUTTONS:

OK
------------------------------

[jeffersonlourthusamy]

your explanation is amazing Sir. Thank you

[msmani]

Where DML commands will go in this case?