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general graph directorythe serious problem with using an acyclic-graph structure is ensuring that there are no cycles when we insert links to an
acyclic-graph directoriesan acyclic graph permits directories to have shared subdirectories and files the similar file or subdirectory may be in two
what are tree-structured directorieswe can generalize the directory structure to a tree of arbitrary height this permits the user to create their own
what is two-level directoryin the two-level directory structure every user has own user file directory ufd when a user jobs begins or a user logs in
what is single-level directoryall files are constrained in the similar directory which is simple to support and understood one limitation is when the
operations that are to be performed on a directory aresearch for a file we are able to find all files whose names match a exact patterncreate a file
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4
what problems arise if the directory structure is a general graphsearching for a particular file may result in searching the similar directory many
what is a general grapha tree structure where links can go from one branch to a node earlier in the similar branch or other branch allowing
list ways to share files among directories in operating systemsa copy file from one account into anotherb link directory entry of copied file to
what is an acyclic grapha tree that has been corrupted by links to other branches but does not have any cyclic paths in
what is a file path namea list of the subdirectories directories and files we must traverse to reach a file from the root
how do we overcome the disadvantages of the two-level directorygive links from one user directory to another creating path names system files become
what disadvantages are there to this two-level directory without other provisions two users who require cooperating with each other are hampered in
what advantages are there to this two-level directoryusers are isolated from each other users have more freedom in choosing file
what is the mfd ufd how are they relatedmfd is master-file directory which points to the ufds ufd is user-file directory which points to each of
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
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