外文翻譯--數(shù)據(jù)庫信息管理系統(tǒng)簡介-展示頁
2025-05-27 06:44本頁面
【正文】 ation, 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 structure stored in the data dictionary. Various data manipulation database (such as search, modify, insert and delete) and the maintenance of database management is a database model based on. （ 2） Application: the pilation contains applications to access the database statement, piled under the support of DBMS can run the program. （ 3） Interactive query: to provide interactive query language is easy to use, such as is responsible for executing the query mand, and query results are displayed on the screen. （ 4） Organize and access data: data storage device on the physical organization and access method in the periphery. （ 5） Transaction management: provide transaction management and operation of the transaction log, security monitoring and data integrity checks, concurrency control and transaction system recovery function. （ 6） The maintenance of the database: provide software support for database administrators, including data security, integrity and security, database backup, database reorganization and performance monitoring and maintenance tools. According to the thus summarizes the technical characteristics of the database, there are 5 characteristics: (1) the data model to represent plex data structures, data redundancy small, easy to expand, to achieve data sharing. (2) data and the independence of procedure has higher, independent database physical and logical independence. (3) the database system provides a convenient user interface for the user. (4) the database system to provide 4 aspects of data control function, respectively is the concurrency control, recovery, integrity and security. The use of the various application data in the database by the database system in accordance with the provisions, establish a certain data model to organize and, by the unified management and centralized control system. (5) increased the flexibility of the system. Select the database management system, the following aspects should be considered: (1) the difficult easy degree structure database. Needs analysis database management system has no paradigm, namely whether the real world must analysis required by the data model of the system, the establishment of the corresponding model。 中文 3647 字 畢 業(yè) 設(shè) 計 （ 論 文 ） 英 文 翻 譯 課題名稱 系 部 電氣與信息工程學(xué)院電信系 專 業(yè) 電子信息工程 班 級 學(xué) 號 姓 名 指導(dǎo)教師 時 間 2 0 1 4 年 3 月 29 日 Introduction to database information management system The database is stored together a collection of the relevant data, the data is structured, nonharmful or unnecessary redundancy, and for a variety of application services, data storage independent of the use of its procedures。 insert new data on the database , revised, and the original data can be
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