You can use any user identification code (UIC) for the account that owns a system-level installation as long as it is not used by any other Ingres installation. For a group-level installation, we recommend that you choose a group UIC that does not automatically confer system privileges. This means a UIC greater than the SYSGEN parameter, MAXSYSGROUP.

If you have more than one installation on a particular node, you must place these installations in separate group UICs. For example, if the UIC for the system-level installation is [300,1], the UIC for a group installation on the same node can be [400,1], but cannot be [300,*].

The UIC determines the group logical name table for a group-level installation. The users whose group UIC has an installation will be allowed to access their group’s installation by default. Scripts are provided to switch between installations, but users can become confused. Therefore, it is best to be sure the UIC for a given group installation does not include users who must access the system-level installation or a different group installation.