Explain relative file organization, Operating System

Assignment Help:

Relative file organization

A relative file is an array of fixed-length slots and the records can be inserted in the first free slot found from the beginning of the file and at the end of the file or in a specified slot in the file. Relative files are habitually used when record number will access records directly. Since each of the slots in a relative file is the same size, SFS is able to calculate the position of a specific record (identified by record number) by multiplying the record number by the record slot size.

The records in a relative file is able to be composed of fixed or variable-length fields except the size of each slot in the file is that of the maximum record size (which is calculated from the record specification when a relative file is created). The records in a relative file are able to be updated or deleted in place. Any slots free when records are deleted are able to be reused by subsequent insertions.

The primary index or else a relative file are based on the relative slot number (RSN), which correspond to the number of the slot occupied by a record the first relative slot number in a file is slot number 0 and the highest slot number can't exceed the maximum number of records specified when the file was created and the RSN is a physical part of the user's data record in Contrast this with the ESN used in entry-sequenced files. While a relative file is created at least one field must be of type sfs_unsignedInt32. This field ought to be specified as the primary index

 


Related Discussions:- Explain relative file organization

Why do organisations need a structure, Problem 1: (a) The grouping of o...

Problem 1: (a) The grouping of organisational activities (usually into ‘departments' or larger ‘divisions') can be done in different ways. Outline 7 criteria which can be used

Explain the various file types, Explain the various file types A common...

Explain the various file types A common technique for executing file types is to contain the type as part of the file name. The name is split into two parts - a name and an ext

Split the hexadecimal format, The following is a dump of a TCP header in h...

The following is a dump of a TCP header in hexadecimal format: 00CD0018 00000EF1 00000D5D 502200D1 01BF0010 We need to first split the above hex as such 00 CD 00 18 00 00

What are the various layers of a file system, What are the various layers o...

What are the various layers of a file system? The file system is composed of many dissimilar levels. Each level in the design uses the feature of the lower levels to make new f

Inventory differences, What makes a Just-in-Time inventory system differ fr...

What makes a Just-in-Time inventory system differ from a traditional inventory system?

What happens when you high-level format a floppy disk, Question: a. The...

Question: a. The following questions refer to a generic Windows file system: i) Describe what happens when you high-level format a floppy disk? ii) What is the maximum size

Explain single partition allocation., Operating Systems 1. Explain sing...

Operating Systems 1. Explain single Partition Allocation and Multiple Partition Allocation. 2. What do you mean by PCB? What useful information is available in PCB? 3. De

Explain secondary-storage management, What are the three main activities of...

What are the three main activities of an operating system in regard to secondary-storage management? a) Free-space management. b) Storage allocation. c) Disk scheduling.

Write in brief on unix file structure, Write in brief on UNIX file structur...

Write in brief on UNIX file structure. UNIX considers every file to be a sequence of 8-bit bytes no interpretation of these bits is made by the operating system. This system pr

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