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De nitions and Introduction to the Subject
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The order and connection of ideas is the same as the order and connection of things
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When we talk informally about a database, we refer to a collection of mutually related data, to the computer hardware that is used to store it, and to the programs used to manipulate it
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By mutually related we mean that the data represents knowledge about a speci c enterprise, say a company, a university, or a governmental institution The data may also be related because it deals with a certain problem area, perhaps about a disease which is of concern to the sta of a number of hospitals The data should be organized so that it can be processed to yield information
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The organization of the data in a database has to represent the underlying meaning or semantics of the data correctly and e ciently In conventional programs the structure of data is arranged for the convenience of the program A database contains data to be used by many and diverse programs The organization of a database can hence not be solely determined by decisions made while programming speci c functions This chapter begins by de ning the concept of a le, since les are the major physical units into which a database is organized The second section discusses operations or tasks performed when using a database In Sec 1-3 we develop a
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De nitions and Introduction
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classi cation of data management which will provide the structure for all subsequent material We then take familiar concepts from programming and relate them to the presented classi cation This sequence is intended to provide a link between our existing programming experience and the approach taken in this presentation of database-management methodology In Sec 1-8 a list of application areas is given as an aid for the selection of a topic for analysis to be followed throughout the text You may have learned nothing new after you have read this chapter, but the framework established will allow us to proceed through the book in an orderly fashion
FILES
A database is a collection of related data The data storage for a database is accomplished by the use of one or more les All les of one database are accessible from one computer or from any interconnected computer if the database is distributed over several computers Procedures in these computers are used to enter data, store data in les, and process the data in response to requests for information A file is de ned to be a collection of similar records kept on secondary computer storage devices Typical of secondary storage devices are disk drives with magnetic disks, but there are a number of alternatives A record is de ned at this point to be a collection of related fields containing elemental data items A more formal and detailed de nition will be developed in Chap 3 A data item is typically represented by a value which is part of a description of an object or an event Computational processes can manipulate such values 1-1-1 Size To warrant the attention and the approaches discussed in this book, the database should be reasonably large We will concentrate on topics that are applicable to
Sec 1-1
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large external les This outlook limits the choice of algorithms that can be applied Collections of data that can be processed in their entirety in the directly addressable memory of a computer, its primary storage, allow techniques that will not be covered here The use of the term database also implies that a variety of people are involved Data entry may be done by people far removed from the users and the data may contain information suitable for several purposes The quantity of data to be handled may range from moderately large to very large These measures of size depend on the hardware and on operational constraints which may apply in a given environment
Large implies a quantity of data which is greater than a single person can handle alone, even when aided by a computer system The actual quantity will vary depending on the complexity of the data and applications An example of a large database is the integrated personnel and product data system in a manufacturing company of about 6000 employees, with more than 300,000 records of 21 types [Emerson in Jardine74 ]
A very large database is an essential part of an enterprise and will be in continuous use by many people At the same time it will require many storage devices A very large database presents particular problems in its management, since it cannot be turned o without a ecting the operation and well-being of the enterprise into which it is integrated A formal de nition of a very large database is one where the time required for making a copy is greater than the permissible interval between update transactions performed to keep the database up to date An example of a very large database is found at a telephone company with 5 million subscribers [Karsner in Kerr75 ] Much larger yet are databases at the social security administration and other national systems
To have a copy of the contents of a le frozen at a certain instant in time is important for many purposes, including periodic analysis of data, backup for reliability purposes, and auditing To avoid problems, it is best not to permit a le to be modi ed while it is being copied In a very large database these two considerations con ict This de nition imposes certain design constraints on the systems which we will be discussing
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