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list disadvantages of using a single directory users have no privacy users must be careful in choosing file names to avoid names used by others users
list operations to be performed on directoriessearch for a file delete a file create a file list a directory rename a file and traverse the file
list two types of system directoriesa device directory- describing physical properties of filesb file directory - giving logical properties of the
explain what isam isindexed sequential access method the file is stored in sorted order isam has a master index file indicating in what part of
how can an index file be used to speed up the access in direct-access fileshave an index in memory the index gives the key and the disk location of
can a direct access file be read sequentially explainyes keep a counter cp initially set to 0 after reading record cp increment
how does user specify block to be fetched in direct access by specifying the relative block number relative to first block in file which is block
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4
what is a sequential filea file that is read one record or block or parameter at a time in order based on a tape model of a
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