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CH14
CH14

... Chapter 14 ...
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Chapter 1

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... A function should belong to one of the following categories  Query database. e.g. browser job lists, search for a particular job with some keyword  Insert data into a database. e.g. add a new job, leave a comment  Update data. e.g. modify a job description ...
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... The covering radius of routing objects of one database tree level created by farthestfirst traversal bulk load decreases while descending the tree. This shows the database the hierarchically clustered well. The radii here are significantly smaller than those of Mtree, which means that we can build a ...
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... interface such as Open Database Connectivity (ODBC) or Java Database Connectivity (JDBC). As a result the information stored for example in a Oracle, Sybase, etc databases, can be accessed at the same time through a single interface as shown in Fig. 11.2 By taking advantage of these mechanisms, it i ...
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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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