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Data flow source adapters use package connections, which point to the server instance or file location of the data source. (The only exception is the raw file adapter, which does not use a package connection.) A source adapter extracts data from sources and moves it into the data flow, where it will be modified and sent to a destination. You create data flow source adapters by dragging a source adapter from the Data Flow toolbox onto the Data Flow tab in the SSIS Designer. Table 1-3 describes the different data flow sources and their uses.

12

//C# ReplicationServer rSvr; ReplicationDatabase rDb; DistributionDatabase dDb; DistributionPublisher dPub; //Connect to the server ServerConnection conn = new ServerConnection(@".\SQL2005STD"); conn.Connect;

Figure 12-16

Provides connections to tables or queries through an ADO.NET provider. Allows extractions from an Excel worksheet defined in an Excel file. Connects to a delimited or fixed-width file created with different code pages. Connects to installed OLE DB providers, such as SQL Server, Access, SSAS, and Oracle. Stores native SSIS data in a binary file type useful for data staging. Allows raw data to be extracted from an XML file; requires an XML schema to define data associations.

If you look closely, you can already get a clue about what might be wrong with this user s ability to connect to the Internet. Specifically, notice that Ping is returning the proper name of the target address (tailspintoys.com), but the Ping requests themselves are not making it through to the target. Therefore, name resolution to a DNS server is likely working properly, but the packets are probably not reaching their final destination. The next most logical tool to use is PathPing, which shows you each route between the client and the target and helps you determine which link is not passing the packet on to the next destination.

4

Figure 12-17

As an example, Figure 1-21 shows the OLE DB Source Editor dialog box for a package that is pulling special offer sales data from the AdventureWorks2008 database with the intention of loading it into the DimPromotions table in AdventureWorksDW2008.

Here, the result returns no sign that the name resolution is occurring. In this situation, the next logical step is to verify the user s DNS settings and server to ensure that both are returning the values expected from the Ping operation. Check to see that the client s network adapter is using a DNS server that is part of your network. (Use the materials found in the next section, Verifying the Computer s Network Settings. )

//Specify the Distribution Database dDb = new DistributionDatabase("DistributionDatabaseName", conn); dDb.MaxDistributionRetention = 12; dDb.HistoryRetention = 24; //Specify the Distributor and create the //Distribution database rSvr = new ReplicationServer(conn); rSvr.InstallDistributor((string)null, dDb); //Specify the Publisher, which in this case is the //same as the distributor dPub = new DistributionPublisher(@".\SQL2005STD", conn); dPub.DistributionDatabase = dDb.Name; dPub.WorkingDirectory = "\\\\" + "SQL2005STD" + "\\repldata"; dPub.PublisherSecurity.WindowsAuthentication = true; dPub.Create(); //Specify the Publication Database rDb = new ReplicationDatabase("PublicationDatabaseName", conn); rDb.EnabledTransPublishing = true; rDb.EnabledMergePublishing = true; //Disconnect conn.Disconnect; 'VB Dim Dim Dim Dim

Troubleshooting Internet Connectivity 12-23

figure 1-21 The OLE DB Source Editor displays that the DimPromotions package is configured to select data from the [Sales].[SpecialOffer] table.

Important In general, a client machine should be pointing at one of your internal DNS servers rather than using your ISP DNS server settings.

If you suspect DNS name resolution issues for your internal servers, you should next run the Nslookup command from the client system. Nslookup can help you determine whether your client is getting the right records returned from the DNS server you have told it to use.

The OLE DB source adapter is similar to the ADO.NET adapter in that a connection manager is required and either a table needs to be selected or a query needs to be written. In this example, the Data Access Mode drop-down list is set to Table Or View, and the [Sales]. [SpecialOffer] table is selected. If the Data Access Mode was set to SQL Command, you could enter a query for the source.

rSvr As ReplicationServer rDB As ReplicationDatabase dDB As DistributionDatabase dPub As DistributionPublisher

If you suspect DNS name resolution issues for names beyond the scope of this partic ular server, or if name resolution issues exist for names outside your company, you should next check the DNS server itself. First, make sure the DNS server is forwarding to the next logical place based on your network design. You perform this task by ver ifying the Forwarders tab, as shown in Figure 12-18.

Figure 12-18

Data flow destinations are similar to sources in that they use package connections. However, destinations are the endpoints in a package, defining the location to which the data should be pushed. For example, if you are sending data to an Excel file from a database table, your destination will be an Excel Destination adapter.