计算机英语(三版)作者刘兆毓郑家农(普通高等教育“一”国家规划教材).pptVIP

* PART Ⅲ APPLICATIONS CHAPTER 7 DATABASE 7.1 DATABASE MANAGEMENT SYSTEMS (DBMS) AND MANAGEMENT INFORMATION SYSTEM (MIS) Cha-7-7.1 7.1 DATABASE MANAGEMENT SYSTEMS (DBMS) AND MANAGEMENT INFORMATION SYSTEM (MIS) Main point ● Basic concepts, functions and structures of DBMS ● Basic concepts, functions and structures of MIS Main 宾语从句 You know that a database is a collection of logically related data elements that may be structured in various ways to meet the multiple processing and retrieval needs of organizations and individuals. There’s nothing new about databases—early ones［1］ were chiseled in stone, penned on scrolls, and written on index cards. But now databases are commonly recorded on magnetizable media, and computer programs are required to perform the necessary storage and retrieval operations. ?1 ● What functions do the computer programs have in a database ? *?1 定语从句 Fig. 7-1 A database management system can give fast response to users with special information needs Fig. 7-1 You’ll see in the following pages that complex data relationships and linkages may be found in all but the simplest databases［2］ . The system software package that handles the difficult tasks associated with, creating accessing,and maintaining database records is called a database management system (DBMS). The programs in a DBMS package establish an interface between the database itself and the users of the database. (These users may be applications programmers, managers and others with information needs,and various OS programs.) 宾语从句 定语从句 *?2 A DBMS can organize, process, and present selected data elements from the database. This capability enables decision makers to search, probe, and query database contents in order to extract answers to nonrecurring and unplanned questions that aren’t available in regular reports［3］. These questions mig