计算机外文翻译.doc

计算机外文翻译



数据库管理系统的介绍
Raghu Ramakrishnan[ Database Management Systems( 3th Edition ),Wiley ,2004, 5-12
]
　　　数据库（database,有时拼作data base）又称为电子数据库，是专门组织起来的一组数据或信息，其目的是为了便于计算机快速查询及检索。数据库的结构是专门设计的，在各种数据处理操作命令的支持下，可以简化数据的存储，检索，修改和删除。数据库可以存储在磁盘，磁带，光盘或其他辅助存储设备上。
　　　数据库由一个或一套文件组成，其中的信息可以分解为记录，每一记录又包含一个或多个字段（或称为域）。字段是数据存取的基本单位。数据库用于描述实体，其中的一个字段通常表示与实体的某一属性相关的信息。通过关键字以及各种分类（排序）命令，用户可以对多条记录的字段进行查询，重新整理，分组或选择，以实体对某一类数据的检索，也可以生成报表。

Database Management Systems( 3th Edition ),Wiley ,2004, 5-12
　　　A introduction to Database Management System
　　　Raghu Ramakrishnan
　　　A database (sometimes spelled data base) is also called an electronic database  , referring to any collection of data, or information, that is specially organized for rapid search and retrieva l by a computer. Databases are structured to facilitate the storage, retrieva l , modification, and deletion of data in conjunction with various data-processing operations .Databases can be stored on magnetic disk or tape, optical disk, or some other secondary storage device.
　　　A database consists of a file or a set of files. The information in these files may be broken down into records, each of which consists of one or more fields. Fields are the basic units of data storage  , and each field typically contains information pertaining to one aspect or attribute of the entity described by the database . Using keywords and various sorting commands, users can rapidly search , rearrange, group, and select the fields  in many records to retrieve or create reports on particular aggregate of data.