COMP 3380 Lecture 1: Chp1 notes - Introduction of Database
12 Oct 2017
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Document Summary
Into is an related organised data disk . of stood on a. Support management the database database additional data system . Dbms provides an that to is both convenient use . environment. Security new program each carry new task out. Uncontrolled access anomalies concurrent accesses can lead to inconsistencies. Failures may inconsistent leave state database with an in partial updates carried out. Various and files , formats . files maybe in different. Data reduced time independence and efficient access application development. A data model concepts data data for constraints describing relationships , is a collection of data data semantics , kiaampbs : i. Relations ace basically tables with rows q column. Er ofodd grade want bginld up dame credits. L records organised as graphs . l relationship among records - bunks /pointes. Network model records organised as tree du of in. Db time . at content the actual is a particular point variable ] value a of schema.
