分布式dbms的概念與設計計算機等專業(yè)畢業(yè)設計論文外文翻譯(已修改)
2025-06-23 04:58 本頁面
【正文】 大連交通大學 2021 屆本科生畢業(yè)設計 (論文 )外文翻譯 1 The Concepts and Design of Distributed DBMS 1. INTRODUCTION A major behind the development of database systems is the desire to integrate the operational data of an anization and to provide controlled access to the data. Although integration and controlled access may imply centralization, this is not the intention. In fact, the development of puter works promotes a decentralized mode of work. This decentralized approach mirrors the anizational structure of many panies, which are logically distributed into divisions, departments, projects, and so on, and physically distributed into offices, plants, factories, where each nit maintains its own operational data. The shareability of the data and the efficiency of data access should be improved by the development of a distributed database system that reflects this anizational structure, makes the data in all units accessible, and stores data proximate to the location where it is most frequently used. Distributed DBMSs should help resolve the islands of information problem. Databases are sometimes regarded, as electronic islands that are distinct and generally inaccessible places, like remote islands. This may be a result of geographical separation, inpatible puter architectures, inpatible munication protocols, and so on. Integrating the databases into a logical whole may prevent this way of thinking. 2． Concepts To start the discussion of distributed DBMSs, we first give a definition of a distributed database. Distributed database: a logically interrelated collection of shared data physically distributed over a puter work. Following on from this we have the definition of distributed DBMS. Distributed DBMS: the software system that permits the management of the distributed database and makes the distribution transparent to users. A distributed database management system consists of a single logical database that is split into a number of fragments. Each fragment is stored on one or more puters under the control of a separate DBMS, with the puters connected by a munications work. Each site is capable of independently processing user requests that require access to local data and is also capable of processing data stored on other puters in the work. Users access the distributed database via application. Applications are classified as those that do not require data from other sites and those that do require data from other sites. We require a DBMSs to have at least one global application. A DDBMS therefore has the 大連交通大學 2021 屆本科生畢業(yè)設計 (論文 )外文翻譯 2 following characteristics: A collection of logically related shared data。 The data is split into a number of fragments。 Fragments may be replicated。 Fragments/replicas are all
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