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
How Virtual memory is implemented Virtual memory can be implemented along with Segmentation and Paging

Question : a) What do you understand by a Directory Structure? Support your answer with a diagram. b) Give an example how Access Lists and Groups are arranged to mode of

What are the methods for handling deadlocks? The deadlock problem can be dealt with in one of the three ways: a. Use a protocol to prevent or avoid deadlocks, ensuring that

Explain the various types of computer systems. Mainframe systems Large Number of CPU with Greatest Processing Power:  Huge Memory Capacity:  Increased Performance by s

TII stands for The abbreviation of TII is Table of incomplete instructions.

What are the operations of processes? Process creation A process may create several new processes. The creating process is called as parent process, where as the new proce

whta is an operating system ? what sorts services are provided by an operating system ?

What is a Dispatcher? The dispatcher is the module that gives control of the CPU to the process selected by the short- term scheduler. This function includes: Switching

with the aid of diagrams describe the following os structures monolithic , layered, client server

Explain the ThreadSwitchWithDelay Function used in Netware ThreadSwitchWithDelay( )   This command is used when threads are waiting for an event or resource but don't want t