Multilevel indexing scheme, Database Management System

Assignment Help:

Multilevel Indexing Scheme

Consider the indexing scheme where the address of the block is consider in the index for each record, for a little file, this index would be little and can be processed efficiently in the main memory. Though, for a large file the size of index can also be very big. In such a case, one can make a hierarchy of indexes with the lowest level index pointing to the records, whereas the higher level indexes point to the indexes on indexes.

The following points about the multi-level indexes given below:

  • The lowest level index points to every record in the file; therefore is costly in terms of space.
  • Insertion, updating, and deletion of records need changes to the multiple index files as well as the data file. Therefore, maintenance of the multi-level indexes is also expensive.

After discussing so much about the indexes let us now turn our attention to how an index can be executed in a database. The indexes are executed through B Trees. The following section defines the index execution in more detail.

 


Related Discussions:- Multilevel indexing scheme

Database Models, Benefits and Limitations od Data Models?

Benefits and Limitations od Data Models?

What are the three data anomalies, What are the three data anomalies that a...

What are the three data anomalies that are likely to occur as a result of data redundancy?  Can data redundancy be completely eliminated in database approach?  Why or why not? A

Shadow copy, why shadow copy technique is used?

why shadow copy technique is used?

Project, the of super market system done in database

the of super market system done in database

Illustrate the cardinality of relationship, Cardinality of Relationship ...

Cardinality of Relationship One-to-One Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher

What is an index as defined in oracle, Normal 0 false false ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

MYSQL, i have a homework assignment identical to one you have listed

i have a homework assignment identical to one you have listed

How the one-to-one associations have to be implemented, Discuss how the one...

Discuss how the one-to-one associations have to be implemented. Some of properties of associations can be implemented directly by providing suitable declarations of the data me

Describe deductive databases and relational databases, Problem : (b) A ...

Problem : (b) A deductive database system is essentially the outcome of applying mathematics logic to database management, where logic is used for both data representation and

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