管理信息系统(第7版)PPT+试题库Ch05-disc.pdf

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1、Chapter 5 Answers to Discussion Questions:1.A DBMS has three capabilities:1)data definition is the capability to specify the structure of the content of the data.Its used to create database tables and define the characteristics of the fields in each table;2)the data dictionary stores definitions of

2、data elements and their characteristics;3)the data manipulation language is used to add,change,delete,and retrieve data in the database.Data dictionaries are important because they are a lasting source of information about each data element that helps ensure the credibility and quality of data.Dicti

3、onaries for large corporate databases should include information about usage,ownership,authorization,security,business functions,programs,and reports that use each data element.2.Data warehouses and data marts store vast amounts of data available for analysis of customers,suppliers,business partners

4、,and employees.If users analyze these data to see new patterns,relationships,and insights they can make better business decisions and improve a businesss competitive strategies.The tools available for business intelligence include database query software,multidimensional data analysis,and data minin

5、g.3.Web browsers are easier to use than most database query languages for accessing and compiling information.An organization can build a Web-based“front-end”to the database without having to rework the database structure itself.No special software for users,other than a browser program,is necessary

6、 for accessing databases attached to a Web site.4.A data mart is a small group of data,or subset,extracted from a larger data warehouse.Its easier and cheaper to sort through a small data mart than to sort through the entire database of a warehouse.An organization can create a data mart focused on a

7、 portion of its data for specific purposes,instead of the entire database.5.Managers should focus on three issues regarding data resources:information policies,data administration,and data quality.Information policies are important management tools because they specify rules for sharing,disseminatin

8、g,acquiring,standardizing,classifying,and inventorying information.Data administration is responsible for specific policies and procedures through which data can be managed as an organizational resource.Data quality audits can identify problems with data quality and help rectify errors in the database before they create even more management problems.