Database design by Gio Wiederhold

By Gio Wiederhold

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1-7. List aspects of your system which you consider especially good or poor for database-system implementation. 9 Give an example of a very large database as defined in Sec. 1-1-1. (page 26) c 1980, 1986, 1997, 2001 by Gio Wiederhold. Chapter 2 Hardware and Its Parameters On a clean disk you can seek forever Thomas B. Steel jr. at share dbms Conference, July 1973 2-0 INTRODUCTION This chapter summarizes the hardware used to store data files: mainly tapes and disks. These descriptions will provide background for the understanding of their operation and performance; in other words, the concern here is what the devices do rather than how they do it.

4 Inspect a file-oriented program that you have access to and select statements which typify some of the classifications given in Table 1-1. 5 Rewrite the control-language statement presented in Example 1-2 in the language of the computer system you have available. 6 Write a query to the database with the patch shown in Example 1-4 which would produce an error. 7 Discuss the desired binding time for elements of a specific file-oriented program. 8 Classify the operating system you have available according to the categories of Sec.

1-4-3 Modularity As database applications become more complex and better understood, formal separation of functions takes place. We use the term module for a small but integrated set of programs which deals with some definable subtask and has well-defined interfaces to the other modules of a larger programming system. The user programs which operate on the database will often be transaction modules. These will use file-access program modules, and they will themselves be used by higher-level modules, which carry out the user’s information-generation requirements.

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