Use a user-defined name in cases where the user-defined methods have been created. In the case where no LOGMECH is specified, the Teradata JDBC Driver uses the local default mechanism. If this default doesn't exist, the default mechanism, as specified by the Teradata Database, is used.
About LOGDATA: It specifies any additional data needed by a logon mechanism, such as a secure token, Distinguished Name, or a domain/realm name. LOGDATA values are specific to each logon mechanism. LOGDATA is not used with the TD2 mechanism.
Note : TIBCO Spotfire will not use the logged in user name but LDAP credentials provided in the information designer instead of database credentials.
Disclaimer: The parameters mentioned in this knowledge article are external (Teradata) parameters. It is not intended to be used "As Is" in a Production environment. Always test in a Development environment.