Passage文章

Database Management System数据库管理系统

professional Terms专业术语administrator n.管理人afford vt.有力appropriate a.适当的cabinet n.柜，箱comprehensive a.综合性的corporate a.集团的，公司的cross-referenced a.可相互参照的extract vt.提取folder n.文件夹item n.项目，物品order v.定购participate v.参与payment n.支付（的款项）picture vt.描写relevant a.相关的request n.请求sort vt.分类，排序，拣选specialist n.专家unpaid a.未付的A database is a large group of stored, integrated ( cross-referenced )data.一个数据库就是一大组存储起来的、集成的（可相互参照）的数据。usually organized in files that can be retrieved and manipulated to produce information.通常它们被组织在文件中，这些数据可以通过检索与操作变换，以产生信息。A database management system(DBMS) is a comprehensive software tool that allows users to create.一个数据库管理系统（DBMS）是一个综合性的软件工具，用户可以用来建立、maintain ,and manipulate the database to produce the relevant management information.维护和操纵数据库，以便产生有关的管理信息。By integrated we mean that the file records are logically related to one another so that all data on a topic can be retrieved by simple requests通过集成（我们所说的集成是指文件记录逻辑上的彼此关联起来），从而使得关于某个题目的全部数据，可以通过简单的请求加以检索。The database management systems software represents the interface between the user and the computer's operating system and database.数据库管理系统相当于用户、计算机操作系统和数据库之间的接口。Picture a typical corporate office with a desk , chairs ,telephone and a row of file cabinents along the wall.现在来描绘一个典型的公司办公室，室内有桌子、椅子、电话及靠墙的一排文件柜。A wide variety of business data is stored in these cabinets.在文件柜中，存有品种繁多的各类商业数据。If the files have been carefully organized and maintained then any piece of data that needs to be retrieved can quickly be located and removed.如果文件已经进行了仔细发组织与保管，那么任何一条数据，可以很快地找到并取出。However ,if the data has not been properly filed, some time and effort will be expended to find it.但是如果数据没有经过任何合适的存档，要找到该条数据所花费的时间和精力就会加大。And ,regardless of how carefully the files have been organized and maintained, you will always need to retrieve related pieces of data.而且无论文件是经过了多么细心地组织与保管，总需要检索与该数据有关的部分。For example ,suppose you need to review the customer files for all invoices for payments due in excess of $2,500 and prepare a simple report.举例说，假定你需要检查超过2，5000美元的全部到期应付款发货票的顾客文件，并需要准备出一份报告。