外文翻譯--數(shù)據(jù)庫信息管理系統(tǒng)簡(jiǎn)介(存儲(chǔ)版)
【正文】 system to meet a specific application areas (eg, personnel management) design. Independent system with its own documents, which are inevitable with a certain degree of redundancy. 2. Integrated information systems through their use of the data were bined. Resource sharing system using a database to achieve integrated objectives. For example, the normal wage system requirements from the human resources and accounting systems found in the data. 3. Artificial system has been developed based on a variety of puter information systems. So far, in a puterized artificial, and still lacks design experience (or) lack of information between users and service personnel exchanges. That is to say, puterbased workflow system directly from the manual system workflow. Often, these systems are independent, and the puter just as a data processor. In the design of these systems, with little regard to their integrated to the end of intent. 4. Information systems according to a batch, online processing or both bination classification. In a batch system, and data will be handled in batches or reports. For example, banks will be a large number of cheque code, and then the end of the day, in batches of cheques, sorting and processing. Also, in order to prevent an airline ticket Talas in Atlanta and another at the same time point of sale outlets from Los Angeles to San Francisco, the last one a flight tickets, airlines must be online booking system, in order to reflect the current status of the database. Most online information system is successful batch requirements. even if the information resources management (IRM) system, and the potential of the puter information system has been widely recognized, most of the systems is still independent batch system. Now most of these systems have lost value, but was redesigned as an integrated, online system. By definition, we can see the prehensive requirements of busi ness managers and pany leaders closer cooperation. Information services professionals as consultants, and the integrated information system and business areas of conflict and differences should be resolved by the user groups. Resolve these differences i n order to achieve a prehensive environmental information services staff to the challenges posed by the user manager. According to the processing object, the hierarchical structure of database management system from high to low in order for the application layer, language translation processing layer, data access layer, data layer, operating system. layer The application layer is the interface layer of DBMS and terminal users and applications, processing a variety of objects is a database application. translation processing layer Language translation is to all kinds of statements database language to language analysis, the view transformation, the authorization check, integrity checking etc.. access layer The object data access layer is a single tuple, it converts the upper set operations into a single record operation. data storage layer The object data storage layer is the data buffer pages and system. system Operating system is the basis of DBMS. The operating system provides access primitives and basic access method is usually used as and DBMS storage layer interface. According to the function division, database management system can be divided into 6 parts: （ 1） Translation: Data Definition Language (DDL). That is translated into internal used it to write the database schema. The logical structure of the database, integrity constraints and physical storage stru
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