Define file organization, Operating System

File Organization

    * Sequential

    * Direct

    * Indexed

A file still if it is stored on a magnetic disk or CD-ROM disk may perhaps have a sequential file organization. These records in this type of sequential file (even though the file is on a medium that allows for direct access) may only be retrieved sequentially.

Alternatively, a file on disk is able to support random access to records if its file organization is either Direct or Indexed. With Indexed and Direct file organization random record access is achieved by means of a "key field".

With Direct file organization records are allocate relative record numbers based on a mathematical formula known as a hashing algorithm. For instance you input a Student ID Number a mathematical formula is applied to it, and the resultant value is the value that points to the storage location on disk where the record is able to be found.

An Indexed file comprises a table that relates key values (for example Student ID Number) to storage locations of the corresponding records. This table is called as the index. It is simply like the index of a book where the key value (topic) has a pointer to the storage location (page number) where the information is stored.

File Organization                     Supported Record Access

Sequential                                 Sequential

Direct                                        Sequential or Random

Indexed                                    Sequential or Random

Posted Date: 6/21/2013 3:37:47 AM | Location : United States







Related Discussions:- Define file organization, Assignment Help, Ask Question on Define file organization, Get Answer, Expert's Help, Define file organization Discussions

Write discussion on Define file organization
Your posts are moderated
Related Questions
Define properties of Time sharing operating system Time sharing:- T his systems uses CPU scheduling and multiprogramming to provide economical interactive use of a system. The

what if we need the portion from a text based on some keyword. For eg. My file is like below, ------------------------------------------------ Order=[ 1 2 3 4 5 Order=[ 6 7 8 9

Virtual File System serves two important functions. 1. It divides file-system-generic operations from their execution by defining a clean VFS interface. 2. The VFS is based


A Unix shell is a shell or command-line interpreter that gives a traditional user interface for the Unix-likesystems and for Unix operating system. Users operates the operation of

Linked list allocation using index The blocks don't have a fixed size. Pointers are utilized to point to the next block in a file. The pointers are set aside as a separate tabl

explain about design issues of network operating system

Translation Look aside Buffer In a cached system, the base addresses of the last few indexed pages is maintained in registers named the TLB that adds in faster lookup. TLB has

Suppose your process starts up, and allocates some memory with malloc(). The allocator will then give part of a memory page to your process. The OS then updates the corresponding p

Explain how protection is provided for the hardware resources by the operating system. Dual mode operation Sharing system resources needs operating system to make sure