COMP-3005-A1.pdf - Assignment 1 COMP 3005 Part 1...

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Assignment 1 COMP 3005
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Part 1 Concepts (30 marks) 1. Data : A value that represents known facts with an implicit meaning. (Intro p.5) 2. Mini World : Some part of the real world for which the database system is developed with its data stored in a database. (Intro p.5) 3. Database : A collection of related data stored on a computer. (Intro p.5) 4. Database System : The database and the application programs developed on top of the DBMS. (Intro p.5) 5. DBA : A database administrator. Responsible for acquiring software and hardware resources, controlling the use of said resources, and monitoring efficiency. A DBA is also responsible for authorizing access to the database. (Intro p.20) 6. End User : This role uses the database on a day to day basis. They also do not know much about the database, especially how it is structured. End users can be naive users or business analysts. (Intro p.22) 7. Data Model : A data model is a kind of data abstraction, it is used to hide storage details and present the users with a conceptual view of the database. It is made of concepts to describe the databases structure. (Intro p.14) 8. Database Schema : The description of the data, elements, data types, and constraints on the database. (Concept p.22) 9. Relational Data Model : A data model specifies how data is structured and operated. First proposed by Dr. E.F.Codd of IBM in 1970. The Relational Data Model consists of the Relation Name, Attributes, a schema, the instances, tuples, and the data which conforms to the domain. A relation looks like a table of values. A relation typically contains a set of rows. There are no duplicate tuples in a relation. Tuples in the relation are unordered. (RDB) 10. Atomic Value : A part of the domain. An atomic value is indivisible, meaning the value cannot be simplified further. (RDB p.10,17)
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