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انتشارات: Computer Science Press, Inc.

اثر: Jeffrey D. Ullman

تعداد صفحه: 498

حجم: 30.9MB

جلد کتاب

توضیحات کتاب (خلاصه پیشگفتار نسخه اول):

It is evident that a course in database systems now plays a central role in the undergraduate and graduate programs in computer science, However, unlike the more traditional and better established systems areas, like compilers and operating systems, where a good mix of principles and practice was established many years ago, the subject matter in database systems has been largely descriptive.

This book is developed from notes I used in a course at Princeton that attempted to bring database systems into the mainstream of computer science. The course was taught to a mix of seniors and first-year graduate students. In it, I tried to relate database ideas to concepts from other areas, such as programming languages, algorithms, and data structures. A substantial amount of descriptive material was included, since students, being used to conventional programming languages, may find query languages rather unusual. The data structures relevant to databases are also somewhat different from the kinds of structures used in conventional programming, since the large scale of a database makes practical many structures that would be only of theoretical interest otherwise.

However, I added to the mix of topics the relevant theory that is now available. The principal concepts that have been found useful are concerned with relations and with concurrency. I have devoted a large portion of the book to a description of relations, their algebra and calculus, and to the query languages that have been designed using these concepts. Also included is an explanation of how the theory of relational databases can be used to design good systems, and a description of the optimization of queries in relation-based query languages. A chapter is also devoted to the recently developed protocols for guaranteeing consistency in databases that are operated on by many processes concurrently.

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