User names used to install and administer Ingres can contain the following ASCII characters only: alphanumeric, at (@), pound (#), dollar ($), underscore (_), hyphen (-), period (.). Administrative user names must begin with an alphanumeric character (unless the name is delimited) and cannot contain a blank character.

Non-administrative user names can contain any characters specific to the installation character set. User names that contain characters outside this range must be delimited.