An operating system uses a Least Recently Used, optimal and also FIFO page replacement algorithm. Consider the following page reference ordering (pages are referenced from left to right): 1, 9, 1, 6, 9, 2, 6, 2, 1, 9, 0. Compute the hit ratio, miss ratio and number of page faults that are generated for all the three algorithms assuming that the process has been allocated four page frames, and that initially, none of the pages are in the main memory.

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Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.