Transcription of Introduction to Database Systems - unibz
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Introduction to Database Systems - unibz
1 Introduction to Database SystemsFundamental ConceptsWerner Nutt2 Characteristics of the DB Approach Insulationof application programsand datafrom each other Use of a catalogueto store the schema Support of multiple user views How can one realise these principles?3A DBMS Presents Programmers and Users with a Simplified EnvironmentUsers/ProgrammersQueries / Application ProgramsSoftware to Process Queries / ProgramsSoftware to Access Stored DataDBMS SoftwareDatabase SystemStored Database Definition(Metadata)StoredDatabase Catalogue , Data dictionary 4 Data Model, Schema and InstanceSchema A formal definition that fixes all the relevant featuresof those parts of the real world that are of interest to the users of the Database The schema of a db is held in the data dictionaryData Model A set of concepts that can be used to describ
4 Data Model, Schema and Instance Schema • A formal definition that fixes all the relevant features of those parts of the real world that are of interest to the users of the database
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Introduction to Object-Oriented Databases, Database, Introduction to Object-Oriented Databases and Database Systems, INTRODUCTION, Database Systems, SYSTEMS SOLUTIONS, Introduction to Database Systems, Chapter 1: Introduction, Systems, AN INTRODUCTION TO RELATIONAL DATABASES, Introduction to Database Design, Lecture Notes in Computer Science