If you are opening an existing file, most file systems linked into the runtime will be searched for the named file. If, however, you are creating a new file, you will need to tell the runtime which file system to use. You accomplish this with one of two configuration variables; the first is:
DEFAULT-HOST filesystem
This will designate the file system to be used for newly created files that are not individually assigned. If this variable is not given a value, the Vision file system is used.
Examples
DEFAULT-HOST INFORMIX
means that all new files will be Informix files unless individually assigned to another file system.
DEFAULT-HOST ORACLE
means that all new files will be Oracle files unless individually assigned to another file system.
See also
The filename-HOST variable, which specifies the file system to be used for one specific file.