The storage structures and access methods used by database system
are specified by a set of definition in a special type of DDL called data
storage-definition language.
Wednesday, 6 August 2014
What is 'inode'?
All UNIX files have its
description stored in a structure called 'inode'. The inode contains info about
the file-size, its location, time of last access, time of last modification,
permission and so on. Directories are also represented as files and have an
associated inode. In addition to descriptions about the file, the inode
contains pointers to the data blocks of the file. If the file is large, inode
has indirect pointer to a block of pointers to additional data blocks (this
further aggregates for larger files). A block is typically 8k.
Inode consists of the
following fields:
Ø File owner identifier
Ø File type
Ø File access permissions
Ø File access times
Ø Number of links
Ø File size
Ø Location of the file data
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