Multi-list file organisation, Database Management System

Assignment Help:

Multi-list file Organisation

Multi-list file organisation is a multi-index linked file organisation. A linked file organisation is a logical organisation where physical ordering of records is not of concern. In linked organisation the series of records is governed by the links that verify the next record in series. Linking of records can be unordered but such a linking is very costly for searching of information from a file. Thus, it may be a good idea to link records in the order of increasing primary key. This will facilitate deletion and insertion algorithms. Also this really helps the search performance. In addition to making order during linking, search by a file can be further facilitated by producing primary and secondary indexes. All these ideas are supported in the multi-list file organisation. Let us describe these concepts further with the help of an example.

Consider the employee data as given in Figure. The record numbers are given as alphabets for better explanation. Suppose that the Empid is the key field of the data records. Let us describe the Multi-list file organisation for the data file.

 

Record

Number

Empid

Name

Job

Qualification

Gender

City

Married/

Single

Salary

A

800

Jain

Software

Engineer

B. Tech.

Male

New Delhi

Single

15,000/-

B

500

Inder

Software

Manager

B. Tech.

Female

New Delhi

Married

18,000/-

C

900

Rashi

Software

Manager

MCA

Female

Mumbai

Single

16,000/-

D

700

Gurpreet

Software

Engineer

B. Tech.

Male

Mumbai

Married

12,000/-

E

600

Meena

Software

Manager

MCA

Female

Mumbai

Single

13,000/-

                                                                  Figure: Sample data for Employee file

Since, the primary key of the file is Empid, thus the linked order of records should be defined as B (500), E(600), D(700), A(800), C(900). Though, as the file size will grow the search performance of the file would deteriorate. Therefore, we can make a primary index on the file (please note that in this file the records are in the logical series and tied together using links and not physical placement, thus, the primary index will be a linked index file rather than block indexes).


Related Discussions:- Multi-list file organisation

Access, I have to solve a problem using access

I have to solve a problem using access

Discuss the method for a hash file to expand shrink dynamic, Discuss the me...

Discuss the methods for a hash file to expand and shrink dynamically. What are the advantages and disadvantages of each? The hashing methods that permit dyanamic file expansi

Define the term database, QUESTION (a)(i) Define the term database. ...

QUESTION (a)(i) Define the term database. (ii) How is it different from a database management system? (b) What is the difference between an entity and an attribute? (c

Write short notes on tuple relational calculus, Write short notes on tuple ...

Write short notes on tuple relational calculus. The tuple relational calculation is anon procedural query language. It defines the desired information without giving a particul

Define hot backup, Hot Backup: Some sites cannot terminate the database wh...

Hot Backup: Some sites cannot terminate the database while creating a backup copy of the files. The cold backup is not a reliable option. So different kinds of backing up database

Create a company database, Company Database: a-)Here is the ER Model ...

Company Database: a-)Here is the ER Model b-)Here is the Relational Model:     IMPORTANT NOTICE FOR SOLUTION TYPE: ***THIS ASSIGNMENT WILL BE SOLVED BY THE

How to deal with the authentication problem, Most computer systems authenti...

Most computer systems authenticate users by asking them for the user name and password. However, the user names and passwords often can be guessed by hackers. Suggest an automated,

Write a short note on qbe, Write a short note on QBE? Stands for "Quer...

Write a short note on QBE? Stands for "Query By Example." QBE is a feature involved along with various database applications which gives user-friendly techniques of running da

3NF Normalization, Need 2 projects completed in 3NF format.

Need 2 projects completed in 3NF format.

Create a entity-relationship diagrams, This project requires you to create ...

This project requires you to create a database design.  Your design will be documented in a set of Entity-Relationship diagrams.  Draw a set of Entity-Relationship diagrams to mode

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd