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INTRODUCTION
Databases and database systems have become an essential part of our daily life. We encounter many activities that involve some interaction with a database almost daily. The examples include withdrawal from a bank and/or deposit, hotel, railway reservation or airline, accessing a computerised library, order a magazine subscription from a purchase items, publisher from supermarkets. In all the above given cases a database is accessed. These may be known as Traditional Database Applications. In these kinds of databases, the information stored and accessed is numeric or textual. Though, with advances in technology in the past few years, dissimilar databases have been developed such as Multimedia Databases that sound messages, store pictures, and video clips,; Geographical Information Systems (GIS) that can store maps, satellite images, and weather data etc., and Real time databases that can control industrial and manufacturing processes. In this section, we will be introducing the concepts involved in the Database Management System.
The Locking Protocol: To manage concurrency related problems we use locking. A lock is mainly a variable that is associated with a data item in the database. A lock can be located
UNION If R1 and R2 are two union compatible relations then R3 = R1 ∪ R2 is the relation having tuples that are either in R1 or in R2 or in both. In case, R3 will have tuples
What will be create when a primary key if combined with a foreign key? A primary key if combined with a foreign key it creates Parent-Child relationship between the tables that
Your friend owns a computer store in Yuen Long, selling Desktop and Notebook PCs and other computer peripherals. Having been rather successful with his business there, he decided t
It is not possible to make an ABAP/4 program, which having only Subroutines. False. We can make ABAP/4 program, which having only Subroutines.
Many-to-many : Entities in A and B are related with any number of entities from each other. Example: Taught_by Relationship among course and faculty. One faculty member ca
Process of normalization is the integral part of designing a database. Justify this statement with suitable database design
(a) Why did SAP introduce the extended star schema?
Explain Hashing techniques The hashing techniques can be categorized as: Static Hashing Techniques - In this method, the data can be viewed a collection of buckets, along with
online eductional management system ke diagram
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