Terminology used for files structures, Data Structure & Algorithms

Assignment Help:

Given are the definitions of some important terms:

1) Field: This is an elementary data item characterized by its size, length and type.

For instance,

Name                   :           a character type of size 10

Age                      :           a numeric type

2) Record: This is a collection of associated fields that can be treated as a unit from an application viewpoint.

For example:

A university could employ a student record with the fields, namely, University enrolment no. and names of courses.

3) File: Data is organized for storage in files. A file is a collection of similar, associated records. It has an identifying name.

For instance, "STUDENT" could be a file containing student records for all the students in a university.

4) Index: An index file corresponds to a data file. Its records have a key field and a pointer to that record of the data file that has the similar value of the key field.

The data stored in files is accessed by software that can be divided into the following two categories:

i) User Programs: Usually these are written by a programmer to manipulate retrieved data in the manner attained by the application.

ii) File Operations: this deal along with the physical movement of data, in and out of files. User programs effectively employ file operations through appropriate programming language syntax The File Management System handle the independent files and behaves as the software interface among the user programs and the file operations.

File operations can be categorized as

  • CREATION of the file
  • INSERTION of records into the file
  • UPDATION of earlier inserted records
  • RETRIEVAL of earlier inserted records
  • DELETION of records
  • DELETION of the file.

Related Discussions:- Terminology used for files structures

Algorithm for determining who won rock paper scissors game, Suppose you are...

Suppose you are given the results of 5 games of rock-paper-scissors. The results are given to you on separate pieces of paper; each piece says either 'A' if the first person won, o

Linear array - numerical, Q. A linear array A is given with lower bound as ...

Q. A linear array A is given with lower bound as 1. If address of A[25] is 375 and A[30] is 390, then find address of A[16].

Splaying procedure, For splaying, three trees are maintained, the central, ...

For splaying, three trees are maintained, the central, left & right sub trees. At first, the central subtree is the complete tree and left and right subtrees are empty. The target

Sparse matrix, How sparse matrix stored in the memory of a computer?

How sparse matrix stored in the memory of a computer?

Data manipulation, perform the following length operation LENGTH("welcome t...

perform the following length operation LENGTH("welcome to ICA")=

Addressing modes, Compare zero-address, one-address, two-address, and three...

Compare zero-address, one-address, two-address, and three-address machines by writing programs to compute: Y = (A – B X C) / (D + E X F) for each of the four machines. The inst

Discuss the properties of adt, Question 1 Write a program in 'C' to rea...

Question 1 Write a program in 'C' to read N numbers and print them in descending order Question 2 Discuss the properties of ADT Question 3 Write a note on

Advantages of dry running a flowchart, Advantages of dry running a flowchar...

Advantages of dry running a flowchart When dry running a flowchart it's advisable to draw up a trace table illustrating how variables change their values at every stage in the

Illustrate trivariate colour models, Illustrate Trivariate Colour Models ...

Illustrate Trivariate Colour Models Conventional colour models based on the tristimulus theory all contain three variables and so are called trivariate models. Let us now consi

Graph, explain the prims''s algorithm with suitable example?

explain the prims''s algorithm with suitable example?

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