Make sure you understand the format and function of the TDGSS configuration files. See About the TDGSS Configuration Files. Create the identity map in a text editor such as vi or Notepad. See Configuring an Identity Map. Add the identity map to the TdgssUserConfigFile.xml on Teradata Database nodes. See Making Changes to the TdgssUserConfigFile.xml on Database Nodes. If the configuration does not function properly or is not useful, you can revert to the previous configuration. See Returning to an Old Configuration.