Clustering indexes, Database Management System

Assignment Help:

Clustering Indexes

It may be an excellent idea to keep data of the students in the order of the programme they have registered as most of the data file accesses may need student data of a particular programme only. An index that is formed on an ordered file whose records of a file are physically ordered on a non-key field (that is the field does not have a distinct value for every record) is known as a clustering index.

            1772_Clustering Indexes.png

 

                                Figure : A clustering Index on Programme of an employee file

                    1031_Clustering Indexes 1.png

Figure: Clustering index with separate blocks for each group of records with the same value for the clustering field

Please note the following points in the tables:

  • Data insertion and deletion is simpler than in the earlier clustering files, even now it is cumbersome.
  • The additional blocks allocated for an index entry are in the kind of linked list blocks.

 • Clustering index is one more example of a non-dense index as it has one entry for each distinct value of the clustering index field and not for all records in the file.


Related Discussions:- Clustering indexes

Explain the acid properties of a transaction, Explain the ACID properties o...

Explain the ACID properties of a transaction Ans: ACID properties are a significant concept for databases. The ACID stands for Atomicity, Consistency, Isolation, and Durability

Advantages to copying records from one table to another, What kind of advan...

What kind of advantages to copying records from one table to another? -) When an algorithm that modifies a table is used after that it's safer to work with the copy -) When

Relational model, A model in database system mostly defines the organisatio...

A model in database system mostly defines the organisation of data or structure and a set of operations on that data. Relational model is a easy model in which database is represen

Design of distributed databases, Design Of Distributed Databases: The dist...

Design Of Distributed Databases: The distributed databases are mainly relational at local level. So a local database schema is the similar as that of a centralised database design

What are the disadvantages of file-processing system, What are the disadvan...

What are the disadvantages of file-processing system?  Ans: The Disadvantages of File-Processing System a. Data redundancy and inconsistency - Data redundancy means not nece

Develop a database design , A practice called Perfect Pets provides private...

A practice called Perfect Pets provides private health care for domestic pets throughout America. This service is provided through various clinics located in the main cities of Ame

What is data dictionary, What is Data dictionary? A data dictionary is ...

What is Data dictionary? A data dictionary is a reserved space in a database that is employed to store information about the database itself. A data dictionary may consist o

Describe hashing in dbms, Describe Hashing in DBMS? Hashing: Hashing ...

Describe Hashing in DBMS? Hashing: Hashing is a technique to store data within an array so which storing, searching, inserting and deleting data is fast (in theory it's O(1))

Commercial database architecture, At its most essential level the DBMS arch...

At its most essential level the DBMS architecture can be divide into two parts: the back end and the front end. The back end is responsible for managing the physical database an

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