Information Management Giovanni ̀ degli Studi di databases • Characteristics • Schema oriented Copyright By PowCoder代写 加微信 powcoder • ACID properties • Keep large amounts of persistent data • Thanks to transactions, they limit the complexity of the management of concurrency • Integration among multiple applications made possible through a shared database • (Mostly) standard […]
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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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Question 1) Information Management Prof. , Prof. September 2, 2021 Time available 2:00 hours 1. Illustrate the problem of global serializability in a distributed system. Copyright By PowCoder代写 加微信 powcoder 2. Illustrate the concept of happened before characterizing logical clocks. 3. Fill the attached schema indicating the timestamp associated with each operation of each process.
Causal consistency (1) • Causal consistency is a weaker version of sequential consistency • If event a caused or influenced event bàeveryone should see a and then b • Writes that are potentially causally related must be seen by all the processes in the same order Copyright By PowCoder代写 加微信 powcoder • Concurrent writes may
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Question 1) Information Management Teacher: Prof. June 21, 2019 Time available 2:00 hours Copyright By PowCoder代写 加微信 powcoder 1. Illustrate the two phase commit protocol for the management of distributed commit. 2. Discuss the possible failures that the protocol could need to face and how they are addressed. 3. Consider the following schedule of operations
Concurrency control (1) Permits the concurrent execution different transactions • Crucial in information systems with high load • banks,financialinstitution,airlinebooking • Permits to efficiently use the DBMS Copyright By PowCoder代写 加微信 powcoder • Maximizing the number of served transactions • Minimizing response times • Application load measured in transactions per second (tps) • Typical values: from
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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 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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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 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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