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Optimal page replacement
An optimal page replacement algorithm has the least page fault rate of all algorithms. The algorithm states that a 'replace the page that will not be used for the longest period of time'.
The drawback of this algorithm is that it is very hard to execute as it requires future knowledge of the reference string.
Example Consider the reference string 1,2,3,4,3,1. Here 1,2,3 are inserted as normal however when 4 comes we replace 2 as it isn't used again.
What is a sequential file? A file that is read one record or block or parameter at a time in order, based on a tape model of a file.
The physical memory acts as a cache backed by the disk. When the physical memory is full, and we want to read in another page from disk, we have to evict a page from physical memor
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Relative file organization A relative file is an array of fixed-length slots and the records can be inserted in the first free slot found from the beginning of the file and
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