, you can load data into a geodatabase using a template that corresponds to the data model or product specification you are using. This template, named a cross-reference database, contains mapping information between the data being loaded (the source workspace) and the database into which the data is being loaded (the target workspace). The cross-reference database contains information that controls mapping information between the source and target workspaces. This includes which source features should be loaded into a target dataset with WHERE clauses and, if applicable, the appropriate subtype. In addition to that, it also contains tables that define field mapping and value substitution. Using the Data Loader tool, you can load data from one geodatabase, coverages, or set of shapefiles into another geodatabase that may or may not have the same schema. This can append data to existing databases or load it into an empty schema. The target workspace must contain the schema referenced in the cross-reference database, at a minimum. The loading process is completed in a series of steps that are presented in a wizard. The first part of the process requires you to navigate to the cross-reference database, the source workspace, the target workspace, and an output location for the log file created. This sets up the mapping information between the data that is going to be loaded and the database into which the data is going to be loaded. The log file is generated as a text file that contains the results of the loading process for each subtype. The next part of the process is to choose the feature classes that are going to be loaded into the target database. You can choose to load either all or only some of the features from the source workspace. You can choose to perform all the dataset mappings located in the cross-reference database or only a subset. The list in the Data Loader wizard is dependent on the The last part is actually loading the data. After the data is loaded, a log file of the results is also generated that allows you to see the number of features that have been loaded. Verify that the datasets listed in the DatasetMapping table match the feature classes in the source and target workspace. dialog box appears with a summary that shows the cross-reference database, source workspace, target workspace, and log file paths. Source.