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Profile Documents Logout
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PDF
PDF

... unique identifier - and is efficient as distributed if all you wish to do is locate a single structure using the PDB code found in the file name. The computer operating system can perform this query with a ...
Graph sensors data with RRDTool
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GSoC 2016 Application Organization: TARDIS
GSoC 2016 Application Organization: TARDIS

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... application and support software, and recommends infrastructure changes to improve the operating efficiency of the City’s databases.

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... Analysis phase: Start at the begin_checkpoint record and proceed to the end_checkpoint record. Access transaction table and dirty page table are appended to the end of the log. Note that during this phase some other log records may be written to the log and transaction table may be modified. The ana ...
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... • You stay at Domain D1 • An Agent x is located at Domain D2 • You can run x – At D2 and get result at D1 – At D3 and get result at D1 – At D1 and get the result ...
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... the meaning of data. Metadata are also called the data about data. Metadata are normally stored in a specific table called a system table. You can use metadata to find all the tables that contain specific data types, such as Date, or all the columns that have specific names. ...
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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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