> Normal mainframe usage is to create files as temp
It depends upon what “mainframe” is.
At least some mainframes were running databases, like this IBM/360-based airline ticket selling system which was “borrowed” by the USSR and used there a lot since 1980ies.
Can a database be a temp file? 
–
Maxim S. Shatskih
Microsoft MVP on File System And Storage
xxxxx@storagecraft.com
http://www.storagecraft.com