About this task
Some operating systems, and other products,
impose restrictions on user IDs:
- On Windows systems, user
IDs can be up to 12 characters long, but on Linux, UNIX, and z/OS® systems, they are restricted
to eight characters.
- Database products might also restrict user IDs to eight characters;
for example DB2® has this restriction.
If you have a mixed environment, ensure that the user IDs that you
use are limited to a maximum of eight characters.
- Ensure that the case (upper, lower, or mixed) of user IDs is consistent.
In some environments, uppercase and lowercase user IDs are considered
the same, but in other environments, user IDs of different case are
considered unique.
For example, on Windows systems, the user IDs 'tester'
and 'TESTER' are identical; on Linux and UNIX systems, they are recognized
as different user IDs.
- Check the validity of spaces and special characters in user IDs
to ensure that, if used, these characters are accepted by all relevant
systems and products that you install.
Consider the following roles: