File organisation in dbms, Database Management System

File Organisation In Dbms

Introduction

Databases are used to store information. Usually, the principal operations we have to perform on database are those relating to:

  • Retrieving data
  • Creation of data
  • Modifying
  • Removing some information which we are sure is no longer useful or valid.

We have seen that in terms of the logical operations to be done on the data, relational tables give a good mechanism for the entire over tasks. Thus the storage of a database in a computer memory (on the hard disk, of course), is mainly concerned with the following issues:

  • They require storing a set of tables, where every table can be stored as an independent file.
  • The attributes in a table are closely related and, thus, often accessed together. Thus it makes sense to store the dissimilar attribute values in every record contiguously. In fact, is it essential that the attributes must be stored in the similar series, for each record of a table?
  • It seems logical to store all the records of a table contiguously. Though, since there is no prescribed order in which records must be stored in a table, we may choose the series in which we store the dissimilar records of a table.

We shall see that the point (iii) between these observations is quite needful. Databases are used to store information in the form of files of records and are typically stored on magnetic disks. This section focuses on the file Organisation in DBMS, the access methods available and the system parameters related with them. File Organisation is the way the files are in order on the disk and access method is how the data can be retrieved based on the file Organisation.

Posted Date: 3/7/2013 2:34:24 AM | Location : United States







Related Discussions:- File organisation in dbms, Assignment Help, Ask Question on File organisation in dbms, Get Answer, Expert's Help, File organisation in dbms Discussions

Write discussion on File organisation in dbms
Your posts are moderated
Related Questions
Illustrate the class diagram for class room scheduling system If in any college, the number of classrooms are limited which have to be allocated to various classes and instruct

Question (a) Visual Basic is governed by an event processor. Explain the meaning of this phrase. (b) Differentiate between an general procedure and event procedure. (c)

You are working for the ABC Telecom and are given some customer records for data mining. You are asked to discover, from the data, patterns that characterize low-, medium- and high

need to get answer for questions 3&4 on this page in part 1

job scheduling for different cubes

Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.

Project Description: Hi I'm seeking someone to make my dBase application work. I know it's not a 'modern' language but it's what I know. I have written an order program and I ne

am looking for assignment helper for dbms

List the set operations of SQL? 1) Union 2) Intersect operation 3) The except operation

What is Data dictionary? A data dictionary is a reserved space in a database that is employed to store information about the database itself. A data dictionary may consist o