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What is data independence?
Data Independence: Techniques which permit data to be changed without affecting the applications in which procedure it. There are two types of data independence. The first type is data independence for data that is accomplished in a database management system (DBMS). It permits the database to be structurally changed without affecting most existing programs. Programs access data in a DBMS through field and are concerned with just the data fields they use, not the format of the finished record. Therefore, when the record layout is updated (fields added, deleted or changed in size), the only programs which must be changed are those in which use those new fields.
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
What is called query processing? Query processing refers to the range of activities included in extracting data from a database.
Authorisation Authorisation is the culmination of the administrative policies of the organisation. As the name shows, authorisation is a set of rules that can be used to verif
Define the Division Operation of Relational Algebra Let R be a relation comprising attributes (A1,...Ap,Ap+1,...An) and S comprising attributes (Ap+1,...An) DEF: Division
Consider a bank that has a collection of sites, each running a database system. Suppose the only way the databases interact is by electronic transfer of money between one another,
Define seek time. The time for repositioning the arm is known as the seek time and it enhances with the distance that the arm is known as the seek time.
What are the parts of SQL language? The SQL language has various parts: data - definitition language Data manipulation language View definition Transaction contr
1. Develop a flowchart using the decision structure to solve the following problem. A Box Lunch Bonanza is a small catering company that offers 2 different types of box lunches
Objectives Define the terms RECOVERY and INTEGRITY; Define Recovery Techniques; Explain Error and Error detection techniques, and Define types of Authorisation.
multidimensional data model
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