Physical Database Design-Purpose of the physical database design
on Jul 30, 2009- Process of producing a description of the implementation of the database on secondary storage; it describes the base relations, file organizations, and indexes used to achieve efficient access to the data, and any associated integrity constraints...

Relational Algebra Introduction
on Jul 19, 2009Relational Query LanguagesQuery languages: Allow manipulation and retrieval of data from a database.- Relational model supports simple, powerful QLs:• Strong formal foundation based on logic.• Allows for much optimization.- Query Languages != pro...

The design process in DBMS Further
on Jul 15, 2009Storing information about- In this example the file is storing information about:• the staff members who attending courses• the departments in which those staff members work• the courses that are being offered• the actual attendance of an emp...

on Jul 13, 2009hgiecajp4w...

Learn DBMS-Purpose of Database System
on Jul 11, 2009What is usefulness of the DBMS?- In the early days, database applications were built on top of file systems- Drawbacks of using file systems to store data:Data redundancy and inconsistency• Multiple file formats, duplication of information in diffe...

Logical Database Design and the Relational Model in DBMS
on Jul 6, 2009What is Relational Model - Basic Definitions- relational model represent the data in the form of tables- based on mathematical theory- consists of three componentsData structure: Data are organized in the form of tables with rows and columnsData mani...

Learn The design process In DBMS
on Jun 29, 2009Where do databases come from? - There may be an manual system that has reached the limits of its usefulness- processing requirements of the organization may have proved to be beyond the capabilities of flat file systemWhy is database design important...

Learn to Create Data Model in DBMS E-R model
on Jun 25, 2009The Entity Relationship Model in DBMS- The Entity-Relationship model is a set of concepts and graphical symbols that can be used to create conceptual schemasVersions/ Evolution of the E-R Model- Original E-R model by Peter Chen (1976)- Extended E-R m...

How are the Database Users
on Jun 18, 2009

Who are the Database Users?
on Jun 18, 2009