Information Management Data Mining (from the book Data Mining: Concepts and Techniques) Copyright By PowCoder代写 加微信 powcoder Università degli Studi di Mining • What is data mining? It is a set of techniques and tools aimed at extracting interesting patterns from data • Data mining is part of KDD (knowledge discovery in databases) • KDD […]
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Lock management The lock manager is invoked by all the processes that want to access the database • requests: • r_lock(T,x,errcode,timeout) • w_lock(T,x,errcode,timeout) • unlock(T,x) Copyright By PowCoder代写 加微信 powcoder • if the timeout expires, errcode signals an error and, usually, the transaction rolls back and restarts Lock tables Store information for the lock •
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Information Management Università degli Studi di Copyright By PowCoder代写 加微信 powcoder • Teachers Giovanni Livraga • Web page of the course https://homes.di.unimi.it/foresti/index.php?pageid=mIM&language= en&media=screen • Teaching material https://sforestiim.ariel.ctu.unimi.it • Schedule and room Tuesday 13:30 – 17:30 Zoom platform • Tutoring fix an appointment via e-mail • Recording of classes will be made available on Ariel platform
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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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Question 1) Information Management Prof. , Prof. June 21, 2021 Copyright By PowCoder代写 加微信 powcoder Time available 2:00 hours (1:30 hours for students who do not answer to Q5) 1. Describe the concept of logical clock, illustrating its importance, advantages, and disadvantages in distributed scenarios. 2. Fill the attached schema indicating the timestamp associated with
Information Management Transaction Management (slides provided by Prof. Samarati) Università degli Studi di (1) Copyright By PowCoder代写 加微信 powcoder Transaction • Elementary unit of work executed by an application, characterized by specific properties of correctness, robustness, and isolation Transactional system • Systems that provide a mechanism for the definition and execution of transactions by different
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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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SQL Advanced Outline ▪ CASE ▪Subquery – nested, inline, correlated ▪ Views ▪Joins – self join, outer join ▪Set Operators ▪Oracle Functions 2 2 SQL CASE statement The CASE statement used in the select list enables the query to evaluate an attribute and output a particular value based on that evaluation SELECT unitcode, to_char(ofyear,’YYYY’) as
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