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The Distributor server is the common link that enables all the components involved in replication to interact with each other. It contains the distribution database, and it is responsible for the smooth passage of data between the Publisher servers and the Subscriber servers. If the Distributor server is located on the same machine as the Publisher server, it is known as the local Distributor server, but if it is on a separate machine from the Publisher server, it is called the remote Distributor server. In large-scale replication, it is better to house the Distributor server on a remote server. This will not only improve performance, but also reduce I/O processing and reduce the impact of replication on the Publisher server.

The role of the Distributor server varies depending on the type of replication: In snapshot and transactional replication, the distribution database in the Distributor server stores the replicated transactions temporarily and also stores the metadata and the job history. The replication agents are also stored in the Distributor server, except in cases where the agents are configured remotely or pull subscriptions are used. (A pull subscription is one in which the Subscriber server asks for periodic updates of all changes made at the publishing server.) In merge replication, unlike in snapshot and transactional replication, the distribution database in the Distributor server stores the metadata and the history of the synchronization. It also contains the Snapshot Agent and the Merge Agent for push subscriptions.

s Note As you ll see in the upcoming SqlNotificationRequest section, it s also possible for you to use your

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Note A push subscription is a subscription in which the Publisher server propagates the changes to the

Figure 7-22. Drill through from the KPI dashboard to the cube browser. You now have established a drill-through report from SSRS that sends a user to a web-based view of an OLAP cube. This approach of providing drill-down capability provides a way for analysts to publish key cube views but still gives the end users the option to open the viewer in Excel and conduct their own analysis.

The distribution database is a system database that is created when the Distributor server is configured. You should not drop the distribution database unless you want to disable it. It stores information about not only replication, but also the metadata, job history, and transactions.

Figure 9-9. The query notifications objects of a new database An application can create a SqlDependency object and register to receive notifications via an event handler. Table 9-3 shows the most important members of the SqlDependency class. Table 9-3. Members of the SqlDependency Class

The four system databases master, model, msdb, and tempdb are created when SQL Server is installed. If you open Windows Explorer, you will find the data files (.mdf files) listed in the following directory, assuming that you installed SQL Server in the same directory as I did: C:\Program Files\Microsoft SQL Server\ MSSQL.1\MSSQL\Data\. There is also another system database, called the Resource database, first introduced in SQL Server 2005. The physical location of the data file Mssqlsystemresource.mdf is in the BINN directory of the instance. Each instance of SQL server contains only one resource database. It does not show up in the list of system databases in the SQL Server Management Studio (SSMS). If you try to add this, then you will get the following error message: You cannot perform this operation for the resource database. (Microsoft SQL Server, Error: 4616) The Resource database is a read-only system database. It contains the physical location of the system objects. As such, in order to upgrade to newer versions of SQL Server, all you have to do is copy this file to the local server. It is worth remembering that you cannot use SQL Server to back up the Resource database, although you can make a file copy of it.

This static method starts the listener for receiving dependency change notifications. This static method stops the listener specified in the previous call to the Start method. This method associates a SqlCommand object with the SqlDependency object. This event occurs when a notification is received for any of the commands associated with the SqlDependency object.

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