Database Fundamentals - ESP
Database Fundamentals : 1File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsDatabaseFundamentalsRobert J. RobbinsJohns Hopkins Fundamentals : 2File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsWhat is a Database ?General: A Database is any collection of related : A Database is a persistent, logically coherentcollection of inherently meaningful data, relevantto some aspects of the real portion of the real world relevant to the Database is sometimes referredto as the universe of discourse or as the Database miniworld. Whatever itis called, it must be well understood by the designers of the Fundamentals : 3File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsWhat is a Database management system ?A Database management system (DBMS) is acollection of programs that enables users to createand maintain a Database . According to theANSI/SPARC DBMS Report (1977), a DBMSshould be envisioned as a multi-layered system :ConceptualSchemaPhysicalDatabaseI nternalSchemaExternalView 1 ExternalView nExternal Level(individual user views)Conceptual Level(Enterprise-wide view\)Internal Level(storage view)Storage Level(physical storage) Database Fundamentals : 4File: N_drive:\jhu\class\1995\ 1994, 1995 Robert RobbinsWhat Does a DBMS Do?
File: N_drive:\jhu\class\1995\db-fund.ppt © 1994, 1995 Robert Robbins Database Fundamentals: 3 What is a Database Management System? A database management system ...
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