I’m not an SQL developer, and since I don’t use these often, I tend to forget, so….

Check mirror port:

SELECT type_desc, port FROM sys.tcp_endpoints;
GO

Set mirror port:

ALTER ENDPOINT Mirroring
STATE = STARTED
AS TCP (LISTENER_PORT = PORT)
FOR database_mirroring (ROLE = Partner);
GO

Set mirror partner:

ALTER DATABASE [Database]
SET PARTNER = ‘TCP://server.domain:PORT’

Asynchronous

ALTER DATABASE [Database]
SET PARTNER SAFETY OFF;
GO

More to come