Before generating cubes, you must define a data source with an OLE DB connection that will specify from where the cubes will be populated.
- Create a data source in your PDM from the List of data sources or by right-clicking the model in the browser and selecting  from the contextual menu.
 
- Select the OLE DB tab and specify the kind of data provider.
 
- Click the ellipsis tool to the right of the connection string field to open the provider-specific configuration dialog. 
 
- Complete the parameters appropriately, click Apply to Connection String, and then Test Connection. Then click Ok to return to the data source property sheet.
 
- Click OK to return to your model.
 
            When you have created the appropriate data sources, you can proceed with generating your cubes.