A bit of history • 1970/1980: Rela%onal databases • Storage is expensive Copyright By PowCoder代写 加微信 powcoder • Dara are normalized • Data are stored regardless of how they will be used • RDBMS become popular • Client/server model • SQL becomes a standard for querying databases • 1990: WWW and Internet • 2000: Web […]
Tree-based indexes (3) • B-trees and B+-trees support searches along one dimension only • Not suited for multi-dimensional data like DWs • Multidimensional trees are an evolution of B-trees for multidimensional data • Describe sets of points through geometric regions containing clusters of points Copyright By PowCoder代写 加微信 powcoder • Clusters are used for search
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Question 1) Information Management Teacher: Prof. July 9, 2019 Time available 2:00 hours Copyright By PowCoder代写 加微信 powcoder 1. Illustrate the concept of happened before characterizing logical clocks. 2. Describe the differences between Lamport clocks and Vector clocks. 3. Fill the attached schema indicating the timestamp associated with each operation of each process. For the
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Information Management Università degli Studi di Databases (slides partially provided by Prof. Samarati) Copyright By PowCoder代写 加微信 powcoder Paradigms for data distribution • Client-server architectures • Separation between the database server and the client • Distributed databases • Several database servers used by the same application • Parallel databases • Several storage devices and processors
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Information Management Data Warehousing (thanks to Wolf- ) Università degli Studi di support systems Copyright By PowCoder代写 加微信 powcoder • The amount of data generated and collected every day is increasing • Decisions are taken based on information extracted from data • Bad decisions can lead to disaster • A decision support system is a
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Information Management Data Warehousing (thanks to Wolf- ) Università degli Studi di support systems Copyright By PowCoder代写 加微信 powcoder • The amount of data generated and collected every day is increasing • Decisions are taken based on information extracted from data • Bad decisions can lead to disaster • A decision support system is a
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LGP modeling (1) • Graph modeling diverges from traditional relational modeling • Once the domain has been captured • Relational: definition of schemas Copyright By PowCoder代写 加微信 powcoder • Graph: enrich the domain with information needed by applications (entities as nodes, roles as labels, connections to neighboring entities as relationships , attributes as properties) •
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Conceptual Modeling Dimensional Fact Model (DMF) • The Dimensional Fact Model (DFM) is a graphical conceptual model for data mart design aimed at Copyright By PowCoder代写 加微信 powcoder • support conceptual modeling • create an environment where queries can be formulated in an intuitive • enable requirement specification • represent a reference point for logical
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A bit of history • 1970/1980: Rela%onal databases • Storage is expensive Copyright By PowCoder代写 加微信 powcoder • Dara are normalized • Data are stored regardless of how they will be used • RDBMS become popular • Client/server model • SQL becomes a standard for querying databases • 1990: WWW and Internet • 2000: Web
MONASH INFORMATION TECHNOLOGY The Relational Database Model Overview We now have a conceptual model for Monash Software, it is time to move to the second stage and map this to a logical model For our unit this will involve mapping to the Relational Model in preparation for implementation in a RDBMS ▪ Relational Model ▪
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