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Problems of reliability, protection, and integrity (Chaps 11, 12, and 13) require a close scrutiny of the available operating system The long-term maintenance of a database is guided by considerations presented in Chap 15 Curricula Modern curricula give increased emplasis to les and databases This book matches the suggested courses well The material of Chaps 1 to 6 covers course CS-5 (Introduction to File Processing) and Chaps 7 to 14 cover course CS-11 (Database management System Design) as speci ed in the report by the ACM Curriculum on Computer Science [Austing et al78 ] The quantitative approach taken in this book causes that algorithmic and analytic material assigned to courses CS-6 and CS-7 is included as w3ell, albeit limited by relevance to databases I do not agree with the recommendation that students write a database management system during CS-11; this is apt to be an exercise in trivializing real issues Design and performance prediction of a nontrivial database application is part of the course taught at Stanford and enables a broad exposure to important concepts beyond programming I agree with Ralston and Shaw80 that mathematical competence is necessary for a computer science student The text provides all the material for the le and database subjects of Courses C1, C2, C3, C4, and D2 speci ed in the Curriculum Recommendations for Graduate professional programs in Information Systems [Ashenhurst72 ] The author feels, however, that these courses are easier to teach using sa depth- rst approach to the subjects versus the breadth- rst approach advocated in the proposal I have been impressed by constructive comments received from readers who used the book for self-study In many schools les and databases are still neglected, possibly because of a shortage of teachers Students who enter industry or commerce with a bachelor slevel education in computing or data-processing feel this void sharply It is now reasonable to expect that students majoring in computing and computer applications should be familiar with this subject area [Teichrow71 , Sprowls75 ] Projections regarding the future use of computers give a considerable weight to the importance of the database area [Dolotta et al76 ], so that we can expect an increasing demand for educational services in this area Terminology We are grateful that the terminology in the area of database and le management is becoming more consistent Within this book a major e ort has been made to de ne all terms and to use only one term per concept some terms were changed since the rst edition because usage developed di erently than I had foreseen All terms are listed in the index In order to aide both experienced readers and users of the references, Appendix A cites common alternate terminology and compares it with the terminology used in this text The introductory chapter is mainly devoted to de nitions It is assumed that subjects such as programming and basic functions of operating systems are familiar to the reader.

memories, do not require a seek When the seek time s is zero, the e ect of rotational latency and transfer rate becomes more important than the discussions imply All the formulas developed will still hold when s = 0 The bene ts of double bu ering is relatively greater, since it applies to the latency

Some tables need more than one column in the primary key In the Enrollment table, the combination of StdSSN and OfferNo is the only candidate key Both columns are needed to identify a row A primary key consisting of more than one column is known as a composite or a combined primary key CREATE TABLE Enrollment (

pointer address(reference ob) const; const_pointer address(const_reference ob) const; pointer allocate(size_type num, allocator<void>::const_pointer h = 0);

Sec 2-5

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OfferNo INTEGER, StdSSN CHAR(11), EnrGrade DECIMAL(3,2), CONSTRAINT PKEnrollment PRIMARY KEY(OfferNo, StdSSN) ) Nonminimal superkeys are not important because they are common and contain columns that do not contribute to the uniqueness property For example, the combination of StdSSN and StdLastName is unique However, if StdLastName is removed, StdSSN is still unique Referential Integrity

Returns the address of ob Returns a pointer to allocated memory that is large enough to hold num objects of type T The value of h is a hint to the function that can be used to help satisfy the request or ignored Constructs an object of type T with the value specified by val at ptr Deallocates num objects of type T starting at ptr The value of ptr must have been obtained from allocate( ) Destroys the object at ptr Its destructor is automatically called Returns the maximum number of objects of type T that can be allocated

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