01 - DBMS

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Information System• an Information System is a set of dataphysically organized in secondary memoryand managed in such a way as to allow itscreation, updating and interrogation12
Information System• data is conceptually organized in aggregatesof homogeneous information that constitute thecomponents of the information system, andeach update operation is targeted to a singleaggregate, while a query may involve one ormore than one aggregate• in databases:– aggregates of homogeneous information: files– indexes: files that allow you to quickly retrieveinformation from the "main files"13
Page 1 and 2: Lesson 1 - Introduction to database
Page 3 and 4: Structured informationinformation i
Page 5 and 6: What happened earlier?●each appli
Page 7 and 8: DBMS●●●a Database (DB) is a s
Page 9 and 10: Storagedatabase systems use files t
Page 11 and 12: Processing information• goal: to
Page 13: Shared information• database shar
Page 17 and 18: Data Model• structures to be used
Page 19 and 20: Historical noteshierarchicalmid-60s
Page 21 and 22: Hierarchical model• restricted ty
Page 23 and 24: Relational model• data and relati
Page 25 and 26: Relational model• table = set of
Page 27 and 28: Example of relational DBSTUDENTSMat
Page 29 and 30: Historical notes●mid-80s: first o
Page 31 and 32: The three abstraction levels of a D
Page 33 and 34: A view (external schema)CoursesCour
Page 35 and 36: Data independence• physical indep
Page 37 and 38: Schemes and instances• in every d
Page 39 and 40: Schemes andinstancesSTAFFNAME SURNA
Page 41 and 42: Database languages• data definiti
Page 43 and 44: Integrity●The data must satisfy
Page 45 and 46: Security• data must be protected
Page 47 and 48: Restore• To restore a correct dat
Page 49 and 50: DBA Tasks●design definition and d

01 - DBMS

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