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

Define program preemption, Define Program preemption The Forced de-allo...

Define Program preemption The Forced de-allocation of the CPU from a program which is executing on the CPU is known as Program preemption

Illustrate scope of consumer behaviour, Q. Illustrate Scope of Consumer beh...

Q. Illustrate Scope of Consumer behaviour ? Scope of consumer behaviour is extremely wide due to following reasons: >>Ever rising intensifying competition. >>Additional a

How is it different from the unbounded buffer algori, How is it different f...

How is it different from the unbounded buffer algorithm ? Explain.

Design a android application, As mentioned earlier, the game engine will b...

As mentioned earlier, the game engine will be used as the base of developing the Go game for the Android. This includes improving logic of the game, design good graphics and optim

Introduction to microprocessors, Let us consider the pining details of the ...

Let us consider the pining details of the 68HC11 as shown below.     Each pin has a defined function, some easy, some complex. A microprocessor designer should understan

Explain the sequence of messages in rpc mechanism, Q. Once more considering...

Q. Once more considering the RPC mechanism consider the exactly once semantic. Does the algorithm for implementing this semantic implement correctly even if the ACK message back to

Demand paging, Demand paging With demand paging, a page is called into...

Demand paging With demand paging, a page is called into memory only when a location on that page is actually indexed during run time. With pre-paging, pages other than the one

Making the transition to client - server programming, Making the Transition...

Making the Transition to Client - Server Programming Making the transition to client - server programming is a significant effort. Client - server applications must be designed

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