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A Data Model in software engineering is an abstract model that organizes and documents the business data for interaction between team members and is used as a plan for creating applications, how data are accessed and stored. According to Hoberman (2009), "A data model is a wayfinding tool for both IT professionals and business, which needs a set of text and symbols to precisely illustrate a subset of real information to enhance communication within the organization and thereby lead to a more stable and flexible application environment." A data model explicitly calculates the structure of structured data or data. Typical applications of data models add database models, enabling exchange of data, and design of information systems. Generally data models are described in a data modeling language.
The scenario You have been approached to design and implement a prototype of a distributed information system for a national car part retail outlet chain. The company comprises
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
What is meant by object identifiers? Object-oriented systems use an object identifier to recognize objects. Object identifiers are unique: that is every object has a single ide
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Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
Lock Based Protocol A lock is nothing but a mechanism that tells the DBMS whether a particular data item is being used by any transaction for read/write purpose. As there are t
Consider the following relational schema: PERSON (SS#, NAME, ADDRESS) CAR (REGISTRATION_NUMBER, YEAR, MODEL) ACCIDENT (DATE, DRIVER, CAR_REG_NO) OWNS (SS#, LICENSE) Constru
Show, with the help of an example, that relatively high-level transitions result when system or program is stimulated by the outside events. In diagram below, we can observe i
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Lossless-Join Decomposition Let us show an intuitive decomposition of a relation. We require a better basis for deciding decompositions since intuition may not always be r
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