![]() ![]() This allows the DBMS software to work with different databases. Main Characteristics of Database Technology 14 Self-contained nature of a database system A DBMS catalog stores the description of the database. ![]() Some mini-world entities - STUDENTs - COURSEs - SECTIONs (of COURSEs) - (academic) DEPARTMENTs - INSTRUCTORs 10 Some mini-world relationships - SECTIONs are of specific COURSEs - STUDENTs take SECTIONs - COURSEs have prerequisite COURSEs - INSTRUCTORs teach SECTIONs - COURSEs are offered by DEPARTMENTs - STUDENTs major in DEPARTMENTs NOTE The above could be expressed in the ENTITY RELATIONSHIP data model. ![]() Sometimes, the applications are also included.Īlternate Definition Database An integrated collection of more-or-less permanent data.Ĭoncerns of DBMS integrity consistency redundancy (its bad, but replication is good) security 8 2.Įxample of a Database (with a Conceptual Data Model) 9 Mini-world for the example Part of a UNIVERSITY environment. Database Management System By Navathe Ppt Software Package Systemĭatabase Management System (DBMS) A software package system to facilitate the creation and maintenance of a computerized database.ĭatabase System The DBMS software together with the data itself. Mini-world Some part of the real world about which data is stored in a database. Later implemented in a large variety of systems - IDMS (Cullinet - now CA), DMS 1100 (Unisys), IMAGE (H.P.), VAX -DBMS (Digital).ĭata Known facts that can be recorded and have an implicit meaning. Introduction to Database Systems, C.J.Date Pearson Education.ĭata base System Concepts, Silberschatz, Korth, McGraw hill, V edition. Database Management System By Navathe Ppt Software Package System. ![]()
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