This book was designed for CS245, the second course in the database sequence at Stanford. Here, the first database course, CS145, covers database design and programming, for which the book A First Course in Database Systems by Jeff Ullman and Jennifer Widom, Prentice-Hall, 1997, was written. The CS245 course then covers implementation of a DBMS, notably storage structures, query processing, and transaction management. Use of the Book

We're on a quarter system at Stanford, so the principal course using this book - CS245 - is only ten weeks long. In the Winter of 1999, Hector Garcia-Molina used a "beta" version of this book, and covered the following parts: Sections 2.1-2.4, all of Chapters 3 and 4, Sections 5.1 and 5.2, Sections 6.1--6.7, Sections 7.1-7.4, all of Chapter 8, Chapter 9 except for Section 9.8, Sections 10.1-10.3, Section 11.1, and Section 11.5.

The balance of Chapters 6 and 7 (query optimization) is covered in an advanced course, CS346, where students implement their own DBMS. Other portions of the book that are not covered in CS245 may appear in another advanced course, CS347, which talks about distributed databases and advanced transaction processing.

Schools that are on the semester system have the opportunity to combine the use of this book with its predecessor: A First Course in Database Systems. We recommend using that book in the first semester, coupled with a database-application programming project. The second semester could cover most or all of the content of this book. An advantage to splitting the study of databases into two courses is that students not planning to specialize in DBMS construction can take only the first course and be able to use databases in whatever branch of Computer Science they enter. Prerequisites

The course on which the book is based is rarely taken before the senior year, so we expect the reader to have a fairly broad background in the traditional areas of Computer Science. We assume that the reader has learned something about database programming, especially SQL. It is helpful to know about relational algebra and to have some familiarity with basic data structures. Likewise, some knowledge of file systems and operating systems is useful. Exercises

The book contains extensive exercises, with some for almost every section. We indicate harder exercises or parts of exercises with an exclamation point. The hardest exercises have a double exclamation point.

Some of the exercises or parts are marked with a star. For these exercises, we shall endeavor to maintain solutions accessible through the book's Web page. These solutions are publicly available and should be used for self-testing. Note that in a few cases, one exercise B asks for modification or adaptation of your solution to another exercise A. If certain parts of A have Web-published solutions, then you should expect the corresponding parts of B to have solutions as well.We hope to make available the notes for each offering of CS245 and relevant portions of other database courses, as we teach them, including homeworks, exams, and solutions. Acknowledgements

Thanks go to Brad Adelberg, Karen Butler, Ed Chang, Surajit Chaudhuri, Rada Chirkova, Tom Dienstbier, Xavier Faz, Tracy Fujieda, Luis Gravano, Ben Holzman, Fabien Modoux, Peter Mork, Ken Ross, Mema Roussopolous, and Jonathan Ullman for assistance gathering material and/or discovering errors in earlier drafts of this work. Remaining errors are ours, of course.

H. G.-M.
J. D. U.
J. W.
Stanford, CA

Back Cover Copy

Three well-known computer scientists at Stanford University-Hector Garcia-Molina, Jeffrey D. Ullman, and Jennifer Widom-have written one of the most comprehensive books on database system implementation. Hector Garcia- Molina pioneered this book at Stanford as a second database systems course for computer science majors and industry-based professionals. It focuses on the implementation of database systems, including storage structures, query processing, and transaction management. Database System Implementation is valuable as an academic textbook or a professional reference.

• Provides extensive coverage of query processing, including major algorithms for execution of queries and techniques for optimizing queries
• Covers information integration, including warehousing and mediators, OLAP, and data-cube systems
• Explains error-correction in RAID disks and covers bitmap indexes, data mining, data statistics, and pointer swizzling
• Supports additional teaching materials found on the book's Web page at http://www-db.stanford.edu/-html
• For college courses Prentice Hall offers a two-book package discount with A First Course in Database Systems and Database System Implementation

This text covers a broad spectrum of knowledge and technology. This carefully class-tested, highly readable presentation provides students or professionals with the next level of study. Written from the point of view of the database designer, user, and application programmer, this book provides practical advice from well-know experts on how to implement state-of-the-art database systems.