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The next step in the process is to create a second database on a second server that has the same name, schema, and set of data as the first. For this example, I added a second instance of SQL Server called BIOREPL_PEER and made a backup copy of the mysales_peer database on the BIOREPL server instance, and I will restore it on the BIOREPL_PEER server instance. Normally you should back up after creating the publication on the first node. In this instance, the node is BIOREPL. You should also verify that there is no activity on any of the other nodes before adding them to the peer-to-peer topology. Otherwise, you will have to create a new backup and then synchronize the newly added nodes with the first node so that the metadata is the same on all the nodes.

Figure 9-10. The UI of the sample application When you click the Get Data button, the cmdGetData_Click method is called, which then calls the GetData method. Listing 9-23 shows the implementation of both methods.

Since the name of the database to be restored on the BIOREPL_PEER instance also needs to be the same as on the first instance, I created a database called mysales_peer on this server instance. Right-click the mysales_peer database in the BIOREPL_PEER server and select Tasks Restore Database. This will display the Restore Database window shown in Figure 8-38.

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Microsoft BI platform provides by stepping through an example with specific relevance for our marketing team. The example we ll be stepping through in Exercise 7-4 is one of creating ad hoc dashboards. The marketing team is always looking to combine data from transactional systems and ad hoc Excel sheets to deliver a complete picture of key events and campaigns as they are happening. Its work tends to be less structured than the sales team s and to change with little advance notice so our example focuses on using the BI platform with SharePoint to provide visibility into both structured application data as well as ad hoc Excel data.

Figure 8-38. Restoring the mysales_peer database on the second server instance Select the Options page, as shown in Figure 8-39. Ensure that you do not check the Preserve the replication settings check box. In my case, I checked the box for Overwrite the existing database, since I created this database originally on this server instance. Then click OK to restore the database. Figure 8-40 shows the successful restoration of the database.

Listing 9-23. Implementation of the cmdGetData_Click and GetData Methods private void cmdGetData_Click(object sender, EventArgs e) { SqlDependency.Stop(_connectionString); SqlDependency.Start(_connectionString); if (_cnn == null) _cnn = new SqlConnection(_connectionString); if (_cmd == null) _cmd = new SqlCommand( "SELECT ProductName, ProductDescription FROM Products", _cnn); if (_dataToWatch == null) _dataToWatch = new DataSet(); GetData(); } private void GetData() { _dataToWatch.Clear(); _cmd.Notification = null;

Now that we have set up the publication, enabled it for peer-to-peer replication, and initialized the database schema and the data, the next step is to configure the peer-to-peer topology.

SqlDependency dependency = new SqlDependency(_cmd); dependency.OnChange += new OnChangeEventHandler(dependency_OnChange); using (SqlDataAdapter adapter = new SqlDataAdapter(_cmd)) { adapter.Fill(_dataToWatch, "Products"); dataGridView1.DataSource = _dataToWatch; dataGridView1.DataMember = "Products"; lblCount.Text = _dataToWatch.Tables["Products"].Rows.Count.ToString(); } } As you can see in Listing 9-23, cmdGetData_Click stops and starts the query notifications for the current database connection. On first execution, the SqlConnection and SqlCommand objects are created and used inside GetData. GetData creates a new SqlDependency object and registers an event handler for the OnChange event of the SqlDependency object. In the last step, you retrieve the available data from the Products table through the SqlDataAdapter class. Listing 9-24 is the event handler for the OnChange event of the SqlDependency class.

We have already configured the publication and ensured that the name of the publication database is the same on both nodes. Now right-click the publication that has been enabled for publication on the SSMS (pub_mysalesnew_peer, in this case) and select the Configure Peer-toPeer Topology option in the menu. This will start up the Configure Peer-to-Peer Topology Wizard. Click the Next button on the introductory page, and in the next page the wizard will ask you to select the publication to be configured for the peer-to-peer topology, as shown in Figure 8-41. Select the publication and click Next. The wizard will now ask you to select a peer server instance. At this stage, ensure that you have created a Distributor server for the other nodes; otherwise, you will get a message saying that the server cannot be a peer because it does not have a Distributor.

Figure 8-41. Selecting the publication for which the topology will be configured Right-click the empty space in the Configure Peer-to-Peer Topology Wizard and select Add a New Peer Node. Once you are connected to the server (BIOREPL_PEER), the wizard will then ask you to select the database and specify a number for the Peer Originator ID, as shown in Figure 8-42.

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