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Developing Web-Enabled Decision Support Systems Ravindra K
Developing Web-Enabled Decision Support Systems Ravindra K

...  Create adaptors and datasets and bind them to respective controls. (Bind to list box and data grid.)  Execute a parameter query for second control on some event of first control. (Here we execute parameter query for data grid on selection change event of list box.) ...
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...  Binary vs. n-ary relationship sets Although it is possible to replace any nonbinary (n-ary, for n > 2) relationship set by a number of distinct binary relationship sets, a n-ary relationship set shows more clearly that several entities participate in a single relationship. ...
Management Information Systems 6/e
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... maintain the data dictionary and define the structure of the files in a database  Must create data dictionary for a database before entering any information  Extended Learning Module J covers this  Data ...
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... the world. In this system there exists not only medical information but also information about the environment which the system runs in, usage pattern and much more. This report is about storing data received from log files into a suitable database. Sectra wants to be able to analyze this informatio ...
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- Courses - University of California, Berkeley
- Courses - University of California, Berkeley

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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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