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Introduction - Gavin Soorma
Introduction - Gavin Soorma

ppt - Avi Silberschatz
ppt - Avi Silberschatz

... where loan.loan-number = borrower.loan-number and borrower.customer-name = depositor.customer-name and depositor.account-number = account.account-number and account.balance >= 1000))) ...
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... putting in data that looks really wrong and see if it stops you, warns you, or something! AD-318 | Characteristics of a Great Relational Database ...
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Lecture X - Integrity Constrains
Lecture X - Integrity Constrains

... where loan.loan-number = borrower.loan-number and borrower.customer-name = depositor.customer-name and depositor.account-number = account.account-number and account.balance >= 1000))) ...
Referential Integrity
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... ! The nodes of this graph are the users. ! The root of the graph is the database administrator. ! Consider graph for update authorization on loan. ! An edge Ui →Uj indicates that user Ui has granted update ...
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SLAMinDB: Centralized Graph Databases for Mobile Robotics

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... Now you are employed in a company which is named Lox go. The company uses SQL Server 2008 and all the company data is stored in the SQL Server 2008 database. There are two tables in the company database. The two tables are respectively named Bill and Bill Data. Bill information is stored in the two ...
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System  R:  Relational Approach to  Database Management
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... organized by records and fields and can be easily searched to quickly retrieve the desired information by sorting or filtering the data. The simplest computer database is nothing more than an electronic filing system that can be easily searched and organized. Databases exist in hardcopy as well, suc ...
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... Security is all give and take. Security is a balance between granting sufficient permissions to allow users to get their job done and limiting those permissions to avoid mistakes and discourage malicious activities. To make security workable you also have to balance the risks of granting too many pe ...
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... I like “Learn SQL the hard way” http://sql.learncodethehardway.org/book/ (coaches you through creating a SQLite db on your local computer, entering data into it, and then running queries on it) Why is it “the hard way”? Enforces precision, attention to detail, and persistence by requiring you to ty ...
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... project group. The Show Me facility isolates specific design issues within the context of large complicated models. This unique facility enhances productivity by eliminating the task of sifting through complicated database designs. By displaying only relevant database structures, this window provide ...
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... – A pool of related data is shared by multiple application programs. Rather than having separate data files, each application uses a collection of data that is either joined or related in the database. – A DBMS “knows” everything about the data on the hard storage drive/s, and has complete control o ...
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... Operational data, such as transactional data used by a banking system, an online retailer, or an ERP application. This data is typically both read and written by applications, commonly in response to user requests. A banking application might read your account balance, for instance, then write a new ...
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slides in pdf - Università degli Studi di Milano

... Subset function: finds all the candidates contained in a transaction ...
< 1 ... 161 162 163 164 165 166 167 168 169 ... 459 >

Concurrency control

In information technology and computer science, especially in the fields of computer programming, operating systems, multiprocessors, and databases, concurrency control ensures that correct results for concurrent operations are generated, while getting those results as quickly as possible.Computer systems, both software and hardware, consist of modules, or components. Each component is designed to operate correctly, i.e., to obey or to meet certain consistency rules. When components that operate concurrently interact by messaging or by sharing accessed data (in memory or storage), a certain component's consistency may be violated by another component. The general area of concurrency control provides rules, methods, design methodologies, and theories to maintain the consistency of components operating concurrently while interacting, and thus the consistency and correctness of the whole system. Introducing concurrency control into a system means applying operation constraints which typically result in some performance reduction. Operation consistency and correctness should be achieved with as good as possible efficiency, without reducing performance below reasonable levels. Concurrency control can require significant additional complexity and overhead in a concurrent algorithm compared to the simpler sequential algorithm.For example, a failure in concurrency control can result in data corruption from torn read or write operations.
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