Set Up SQL Server Mirroring T-SQL Script

The first thing you need to do when setting up Database Mirroring is perform a full backup followed by a transaction log backup on the principal server.  You then must restore these to the mirror server using the WITH NORECOVERY option of the RESTORE command.  

/*Create endpoints on both servers*/

CREATE ENDPOINT EndPointName

STATE=STARTED AS TCP(LISTENER_PORT = PortNumber, LISTENER_IP = ALL)

FOR DATA_MIRRORING(ROLE = PARTNER, AUTHENTICATION = WINDOWS NEGOTIATE, ENCRYPTION = REQUIRED ALGORITHM RC4)

/*Set partner and setup job on mirror server*/

ALTER DATABASE DatabaseName SET PARTNER = N'TCP://PrincipalServer:PortNumber'

EXEC sys.sp_dbmmonitoraddmonitoring -- default is 1 minute

/*Set partner, set asynchronous mode, and setup job on principal server*/

ALTER DATABASE DatabaseName SET PARTNER = N'TCP://MirrorServer:PortNumber'

ALTER DATABASE DatabaseName SET SAFETY OFF

EXEC sys.sp_dbmmonitoraddmonitoring -- default is 1 minute

/*FAILOVER */

ALTER DATABASE <database_name> SET PARTNER FAILOVER

ALTER DATABASE <database_name> SET PARTNER FORCE_SERVICE_ALLOW_DATA_LOSS