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1) If the mirror is synchronized then it is possible to do a manual failover

· Right click the principal database -> choose: Task – Mirror.

· In “Database properties” and “Mirroring” – click the button: “Failover”

2) If the mirror is “broken” aka not synchronized, disconnected and the principal database is not running – you can bring the mirror database online by using the following statement:

ALTER DATABASE <database name> SET PARTNER FORCE_SERVICE_ALLOW_DATA_LOSS

If everything goes wrong and it  is not possible to bring the mirror database online – then it might be necessary to remove the mirror partnership og restore the mirror database to bring it online with the following statements. BUT BEWARE you have to setup the mirroring afterwards in order to make the mirroring functionalitet work again.

ALTER DATABASE <database name> SET PARTNER OFF

RESTORE DATABASE <database name> WITH RECOVERY

SELECT

DB_NAME(database_id) AS ‘<DatabaseName>’

, mirroring_role_desc

, mirroring_state_desc

FROM sys.database_mirroring

WHERE mirroring_guid IS NOT NULL;

Below is the result from the principal database showing that it is synchronized:

Well – here’s the situation:

I was asked to setup at database mirroring between 2 SQL 2008 server running in a DMZ zone where they would not be able to joined the company’s domain – so here they were all by themselves with no trustee between them. The problem here is when you configure database mirroring in sql server 2008 the sql service account (which in my case was local user accounts), should be granted the “CONNECT TO ENDPOINT” priviligies on the SQL server at the obesite side of the mirror and that’s a bit tricky when there is no trustee between the 2 servers.

One solutions to this problem (I am sure there are others throughout the www) is to use certificates and here is what I have done:

First of all I have done the initializing configuration:

• backup full and log af principal database (remember to set recovery model to full)
• Copy backup to mirror server
• restore database and logs to the mirror (remember: WITH NORECOVERY).

1.  On the Principal server run the following:

USE master;

CREATE MASTER KEY ENCRYPTION BY PASSWORD = ”1Sample_Strong_Password!@#’;

GO

USE master;

CREATE CERTIFICATE Principal_cert

   WITH SUBJECT = ‘Principal certificate’,

   EXPIRY_DATE = ’01/01/2100′;

GO

CREATE ENDPOINT Endpoint_Mirroring

   STATE = STARTED

   AS TCP (

      LISTENER_PORT=7024

      , LISTENER_IP = ALL

   )

   FOR DATABASE_MIRRORING (

      AUTHENTICATION = CERTIFICATE Principal_cert

      , ENCRYPTION = REQUIRED ALGORITHM AES

      , ROLE = ALL

   );

GO

BACKUP CERTIFICATE Principal_cert TO FILE = ‘e:\cert\Principal_cert.cer’;

GO

2.  On the Mirror server run the following:

USE master;

CREATE MASTER KEY ENCRYPTION BY PASSWORD = ’1Sample_Strong_Password!@#’;

GO

USE master;

CREATE CERTIFICATE Mirror_cert

   WITH SUBJECT = ‘Mirror certificate’,

   EXPIRY_DATE = ’01/01/2100′;

GO

CREATE ENDPOINT Endpoint_Mirroring

   STATE = STARTED

   AS TCP (

      LISTENER_PORT=7024

      , LISTENER_IP = ALL

   )

   FOR DATABASE_MIRRORING (

      AUTHENTICATION = CERTIFICATE Mirror_cert

      , ENCRYPTION = REQUIRED ALGORITHM AES

      , ROLE = ALL

   );

GO

BACKUP CERTIFICATE Mirror_cert TO FILE = ‘e:\cert\Mirror_cert.cer’;

GO

3.  Now copy (exchange) the certificates between the two servers

4.  On the Principal server run the following:

USE master;

CREATE LOGIN Mirror_login WITH PASSWORD = ’1Sample_Strong_Password!@#’;

go

CREATE USER Mirror_user FOR LOGIN Mirror_login;

go

CREATE CERTIFICATE Mirror_cert

   AUTHORIZATION Mirror_user

   FROM FILE = ‘e:\cert\Mirror_cert.cer’

GO

GRANT CONNECT ON ENDPOINT::Endpoint_Mirroring TO [Mirror_login];

GO

5.  On the Mirror server run the following:

USE master;

CREATE LOGIN Principal_login WITH PASSWORD = ’1Sample_Strong_Password!@#’;

go

CREATE USER Principal_user FOR LOGIN Principal_login;

go

CREATE CERTIFICATE Principal_cert

   AUTHORIZATION Principal_user

   FROM FILE = ‘e:\cert\Principal_cert.cer’

GO

GRANT CONNECT ON ENDPOINT::Endpoint_Mirroring TO [Principal_login];

GO

Now the certificates and endpoints are created and configured on both servers – you can start the mirroring by using the mirroring wizard:

Not the page no. (block no.) where dbv failed. –> BX

Now user dba_extents view to query which object is effected.

e.g.

select segment_name from dba_extents
where file_id = PX
and BX between block_id and block_id+blocks-1;