Sql Server Mirroring

Prerequisites:
A) SQL Servers on Principal and Mirror server shopud be started under account with the same name (xyzMachineUser)
B) You should be connected to SQL Server under sqlmirroring SQL Account (With same user name and password: lets say we have account: sqlmirroring )

Steps:
1) Take Full Backup from Principal Database (database must be in Full recovery model)
2) Take Transaction Log backup from Primary Database
3) Restore Full backup on mirror server with NORECOVERY option on mirror server(with user sqlmirroring)
4) Restore Transaction Log backup with NORECOVERY option on mirror server
5) Right click on database you want to start mirroring -> Properties -> Mirroring..
6) Click ”Configure Security” -> Choose not to Configure Witness server -> Connect to Mirror Server under sqlmirroring user (other steps – click next) (Enable encryption – remove checkbox mark)
7) In dialog window choose “Do not start mirroring”
8) Check radiobutton “High Performance”
9) In “Server network addresses” replace machine names to ip addresses of servers
10) Click “Start Mirroring”

If principal server goes down, you should restore mirror database using this commands:
ALTER DATABASE database_name SET PARTNER OFF
GO
RESTORE DATABASE database_name WITH RECOVERY
GO
And connect your front end with this database.
Your website is UP again.