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Figure 15-15. General job properties In the Category field, select REPL-Alert Response from the drop-down list, and then click the ellipsis button. This will open the View Job Category Properties window shown in Figure 15-16. Select the Reinitialize subscriptions having data validation failures option, and then click the Close button. This will return you to the Job Properties window (see Figure 15-15). Select the Steps page in the left pane, as shown in Figure 15-17. If you click the Edit button, you will see that the agent executes the following statement: exec sys.sp_MSreinit_failed_subscriptions @failure_level = 1 The agent reinitializes all subscriptions should the validation fail (@failure_level=1).

Select the Notifications page in the left pane of the Job Properties window (see Figure 15-17), and you will see that the error is written in the Windows Event Viewer, as mentioned earlier. This is shown in Figure 15-18.

All the available SMO classes are implemented in the Microsoft.SqlServer.Smo assembly that is placed inside the Global Assembly Cache (GAC) during the installation of SQL Server 2008. Therefore, you must reference this assembly when you want to use the functionality of SMO in your own project. Now let s talk about how to use SMO.

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Figure 15-18. The validation failure is notified in the Windows Application log Click the OK button to return to the window shown previously in Figure 15-13. Click OK again to set the alert. The next time you run the validation of the publication, any error messages that occur will be logged on the Application log of the Event Viewer.

In standard read-only transactional replication, the subscriptions are read-only. Changes made at the Publisher server are transferred to the Subscriber server either in real time or with a certain time lag, depending on the business requirements. It is therefore imperative that you back up the publication database. However, your backup and recovery strategy for standard read-only transactional replication should also include the restoration of the replicated databases. The process of restoring the publication database from backup depends on the replication options. However, the restoration for the master and msdb system databases from backup are the same for snapshot replication, standard read-only transactional replication with updating subscriptions, and peer-to-peer transactional replication. In this section, I will discuss the backup and restoration of the publication database for standard read-only transactional replication. The server instance that I used for this example is connected using Windows Authentication.

In this section, I ll show you how you can programmatically create a new Service Broker service from scratch with SMO. Create a Console Application project in Visual Studio. From the References node in Solution Explorer, add the required reference to the SMO assemblies: Microsoft.SqlServer.Smo, Microsoft.SqlServer.ConnectionInfo, Microsoft.SqlServer. Management.Sdk.Sfc, and Microsoft.SqlServer.ServiceBrokerEnum. In beginning of the Program.cs file, declare the using directive of the SMO namespace: using Microsoft.SqlServer.Management.Smo; The first SMO object you have to use is a Server object to create a connection to a SQL Server instance (see Listing 12-2). Listing 12-2. Connecting to SQL Server Through SMO Server svr = new Server("localhost"); Console.WriteLine("Language: " + svr.Information.Language); Console.WriteLine("OS version: " + svr.Information.OSVersion); Console.WriteLine("Edition: " + svr.Information.Edition); Console.WriteLine("Root directory: " + svr.Information.RootDirectory); As you can see in Listing 12-2, you can retrieve additional information about the SQL Server instance through the Information property. Figure 12-6 shows the output of this code fragment.

To back up the publication database, we can use a modified version of the code in Listing 15-1 and then run the backup script using the sqlcmd utility. Listing 15-6 shows the modified script. Listing 15-6. Backup Script Running on a Windows-Authenticated SQL Server Instance /*Execute using sqlcmd utility on the BIOREPL\BIOREPL_PEER instance*/ /*Declare the variables to be used for Windows Authentication; the username and password are not specified */ :setvar logintimeout 120 :setvar server "BIOREPL\BIOREPL_PEER" :connect $(server) -l $(logintimeout) /*Back up the database */ BACKUP DATABASE $(db) TO DISK = N'$(path)\$(db).bak' WITH NOFORMAT, INIT, NAME = N'$(db)Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10, CHECKSUM GO /* Locate the appropriate backup set and files */ declare @backupSetId as int select @backupSetId = position from msdb..backupset where database_name='$(db)' and backup_set_id= (select max(backup_set_id) from msdb..backupset where database_name='$(db)' ) /*Verify that the backup is available */ if @backupSetId is null begin raiserror (N'Verify failed. Backup information for database ''$(db)'' not found.', 16, 1) end /*Restore the database */ RESTORE VERIFYONLY FROM DISK = N'$(path)\$(db).bak' WITH FILE = @backupSetId, NOUNLOAD, NOREWIND GO

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