By Sikha Bagui
Facts, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity courting Diagrams and the software program Engineering lifestyles Cycle part 1: Get the necessities for the Database section 2: Specify the Database part three: layout the DatabaseData and information ModelsFiles, files, and knowledge ItemsMoving from three × five playing cards to ComputersDatabase types The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and useful DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional. Read more...
summary: information, Databases, and the software program Engineering ProcessDataBuilding a DatabaseWhat is the software program Engineering Process?Entity dating Diagrams and the software program Engineering lifestyles Cycle part 1: Get the necessities for the Database part 2: Specify the Database section three: layout the DatabaseData and knowledge ModelsFiles, documents, and knowledge ItemsMoving from three × five playing cards to ComputersDatabase types The Hierarchical ModelThe community ModelThe Relational ModelThe Relational version and useful DependenciesFundamental Relational DatabaseRelational Database and SetsFunctional
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Extra info for Database Design Using Entity-Relationship Diagrams, Second Edition
The indexed systems became quite elaborate. The one illustrated was called a relative record indexed system. In the relative record system, one needed to know only which cylinders a file occupied, and then the position of the record could be calculated relative to the starting position of the file. Originally, relative record systems were not popular, whereas there was a common indexed system used primarily on IBM computers that was based on disk geometry (cylinders, tracks, and records) called an indexedsequential system.
Were they stored by telephone number or record number (which might be a customer number)? What happened if a new field was required that was not on existing forms or cards? Such was a data-processing dilemma of the past. When computers began to be used for businesses, data was stored on magnetic media. The magnetic media were mostly disks and tapes. The way data was stored and retrieved on a computer started out like the 3 × 5 cards, but the data was virtual; it did not physically exist where you could touch it or see it without some kind of software to load and find records and some kind of display device to see what the “3 × 5 card” had on it.
What are some of the disadvantages of the network data model? 5. How are all relationships (mainly the cardinalities) described in the hierarchical data model? How can these be a disadvantage of the hierarchical data model? 6. How are all relationships (mainly the cardinalities) described in the network data model? Would you treat these as advantages or disadvantages of the network data model? 7. What are structural constraints? 8. Why was Codd’s promise of the relational model better? 7 CHAPTER SUMMARY In this chapter, we covered concepts that are essential to the understanding and design of a database.