Monday, June 3, 2013

Mirroring Configuration

Mirroring Configuration:
For the Mirroring Configuration we need three servers.
The below are the three Servers used in configurations.
  1. SRIHAAN-PC -- Primary Server
  2. SRIHAAN-PC\DELL –Secondary Server
  3. SRIHAAN-PC\WITNESS --Witness Server

Mirroring Concept:
Database mirroring was introduced with Microsoft SQL Server 2005 technology that can be used to design high-availability and high-performance solutions for database redundancy. It is designed to maintain a hot standby server with a transitionally consistent copy of the database. Mirroring is cost-effective, speedy, requires no special hardware, and ensures transactional consistency.
In the Primary Server we have the database called Simplex and we would be creating the mirror of the database on the Secondary server.

First we have to take the Full Backup of the database on the Primary server.
BACKUP DATABASE Simplex TO DISK=’E:\BACKUP\Simplex.BAK’
GO

The Full Backup taken on the Primary Server has to be copied to the secondary server and this backup has to be restored on the Secondary Server with NORECOVERY mode.
RESTORE DATABASE Simplex FROM DISK=’D:\BACKUP\Simplex.BAK’ WITH NORECOVERY.
GO


The Backup of the database on the Primary Server and Restoring on the Secondary Server has been completed and now the servers are ready for the configuring of the Database Mirroring.
Step for the Database Mirroring.
On the Primary Database Server Right click on the Simplex Database Tasks Mirror.

Clicking on this Opens up a window as Database Properties – Simplex. 

The above is the mirroring configuration window. Click on the Configure Security button.

The above figure shows the configuration of the Database Mirroring Information to be setup.

The above figure shows the information regarding the witness server that has to be setup or not. Click on the Yes and click on the Next button.

Here in the above figure we would be configuring the Witness server. Click Next.

In the above figure we would be configuring the Pricipal Server i.e., Select the Server that acts as the Primary Server. And the Listener port specified here are the default port numbers use for the database mirroring. We can also change the port listeners according to our criteria. Click Next.

Here we have to select the Mirror Server that the server selected would be acting as the Mirroring Server. Listener port is the default port used by the Database Mirroing. Click Next.

We would be select the Server i.e., witness server. If any of the server stops / failovers that information is stored at witness and makes a failover to the Mirror Server. Click Next.


If we have the service accounts created i.e.., different service account for the server that has to specified here. If not leave it blank if the database mirroring is configured on a single service account. Click Next.

The above figure shows the information of the Principal, Mirror and Witness Server. Click Finish. 

The above figure shows that the Principal, Mirror and Witness Server has been configured successfully. Click Close.



In the above figure we have to click on the Start Mirroring. So the Mirroring starts on the servers.


The above figure show the information that is Database Mirroring is configured on the servers and has been started.
It also shows the information that the databases are fully synchronized on both the Servers.






Now we would be performing the Failover of the Primary Server to the Mirror Server.

In the above figure we are inserting a record into the table i.e., the Primary server and after this we would stop the services of the Primary Server such that the Machine has been shutdown and we would see the failover to the Secondary and see the database is synchronized or not.
Now go to Start Runservices.msc

In the above figure we have stopped the services of the Primary Server.

The above figure show the Failover has been done successfully. The data inserted into the Primary server reflected to the Secondary also.
Now we would be starting the services of the Primary Server. Now the Primary Server would be acting as the secondary and the database would be in the Restoring State.
Now we would be making a failover on the secondary server so that Primary takes its own charge.
Go the properties of the database on secondary server.

Now click on the Failover button.

The above figure opens up and Click on the Yes.


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