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
Hi I have got an assignment for making an er diagram for market management software can any budy help me?

Explain the disadvantages of using DBMS There could be a few disadvantages of using DBMS. As DBMS requires computers, we have to invest a good amount in acquiring the hardwa

Describe the types of attributes? Types of attributes: An attribute's category determines the type of values that are permitted in the attribute. For instance, the value vers

The Conceptual Level or Global level The conceptual level presents a logical view of the complete database as a unified whole. It permits the user to bring all the data in th

For the relations answer the following queries in SQL Street (name, location, city) House (number, street_name) Lives (name, house_number) (i) Obtain the names of persons who liv

In how many parts events are classified Events are classified as four types in UML 1.  Signals 2.  Calls 3.  Passing of Time 4.  Change in State

Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than

What are the two types of serializability? The two types of serializability is a)      Conflict serializability b)      View serializability

Differentiate between logical database design and physical database design. Show how this separation leads to data independence? Basis Logical Databas

What is Thread splitting A thread of control is a path by which a set of state diagrams on that a single object is active at a time. Objects are shared between threads