What is major difference between the Historic Unix and .. of Memory Management?

Question

What is major difference between the Historic Unix and the new BSD release of Unix System V in terms of Memory Management?

Answer 1

Historic Unix uses Swapping - entire process is transferred to the main memory from the swap device, whereas the Unix System V uses Demand Paging - only the part of the process is moved to the main memory. Historic Unix uses one Swap Device and Unix System V allow multiple Swap Devices.