How can I add a user and specify a password for a in IBM Data Studio?
Eventually I found that DB2 UDB does not have its own repository for users, unlike other database servers. DB2 relies on the OS for user management. In Windows, for instance, after creating a UDB user, one has to go into Windows Control Panel/User Accounts and add that same user. Then UDB will allow it to log in with the password, supplied on the OS level. I presume that in Linux the procedure is similar: add a user in UDB, then run CLI commands to add a user and to change its password.