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list sample file types based on use on the vax under vms source programs bas for cob pli pas mar data files dat text files txt command
what is a filea named collection of related data explained by the creator recorded on secondary
under what circumstances do page faults occur describe the actions taken by the operating system when a page fault occursa page fault happens
what is a path namea pathname is the path from the root by all subdirectories to a specified file in a two-level directory structure a user name and
define ufd and mfdin the two-level directory structure every user has her own user file directory ufd every ufd has a similar structure but lists
what are the most common schemes for defining the logical structure of a directory the most common schemes for explaining the logical structure of a
what are the operations that can be performed on a directorythe operations that can be performed on a directory are search for a file create a file
what is directorythe device directory or simply called as directory records information-such as name location size and type for all files on that
what are the different accessing methods of a filethe different types of accessing a file are sequential access information in the file is accessed
what is the information associated with an open filevarious pieces of information are associated with an open file which may be file pointer
what are the various file operations the six basic file operations are creating a file reading a file writing a file repositioning within a file
list the various file attributesa file has particular other attributes which vary from one operating system to another but typically having of
what is a filea file is a named collection of related information that is recorded on secondary storage a file having either programs or data a file
what is a reference stringan algorithm is evaluated by running it on a particular string of memory references and computing the number of page faults
what are the various page replacement algorithms used for page replacement fifo page replacement optimal page replacement lru page replacement lru
what is the basic approach of page replacementif no frame is free is available find one that is not presently being used and free it a frame can be
define secondary memorythis memory holds those pages that are not there in main memory the secondary memory is usually a high speed disk it is called
what is a pure demand pagingwhen starting implementation of a process with no pages in memory the operating system sets the instruction pointer to
define lazy swapperrather than swapping the entire process into main memory a lazy swapper is used a lazy swapper never swaps a page into memory
what is demand pagingvirtual memory is commonly executed by demand paging in demand paging the pager brings only those essential pages into memory
what is virtual memoryvirtual memory is a method that allows the execution of processes that might not be completely in memory it is the separation
explain the basic concepts of segmentation segmentation definitionuser view of programhardware used with diagram-segment table base limit amp
inverted page tablein page table the page table has one entry for every page that the process is using the operating system must translate this
hashed page tablesa common approach for handling address spaces larger than 32 bits is to use a hashed page table every entry in the hash table
hierarchical pagingsingle way is to use a two-level paging algorithm in which the page table itself is also paged a logical address is separated into