Normally, users that log on to Vantage have been defined in the database using CREATE USER. However, because many potential database users may already be defined in a directory running within the client network, Vantage allows for authentication and authorization of users by supported directories. Vantage can autoprovision a database user object upon first LDAP authentication.
See Teradata Vantage™ - Advanced SQL Engine Security Administration, B035-1100.