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Demand paging
With demand paging, a page is called into memory only when a location on that page is actually indexed during run time. With pre-paging, pages other than the one given by a page fault are achieved in. The obtains of such pages is done based on common access frames, usually for secondary storage devices.
DESCRIBE OPERATING SYSTEM
Determine a policy that is not a valid page replacement policy? RU policy (Recurrently used) is not a valid page replacement policy.
what is a batch system give me answer in simple words so that i can understand
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