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Introduction to Database Systems CSE 444

Introduction to Database Systems CSE 444. Lecture #1 January 5th, 1998. Staff. Instructor: Alon Levy Sieg, Room 310, alon@cs.washington.edu Office hours: Wednesday 3-4pm (or by appointment) TA: Jake Cockrell

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Introduction to Database Systems CSE 444

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  1. Introduction to Database SystemsCSE 444 Lecture #1 January 5th, 1998

  2. Staff • Instructor: Alon Levy • Sieg, Room 310, alon@cs.washington.edu • Office hours: Wednesday 3-4pm (or by appointment) • TA: Jake Cockrell • “Chateau”, 110, jake@cs.washington.edu • Office hours: TBA

  3. Communications • Web page: • http://www.cs.washington.edu/homes/alon/cs444/index.html • Mailing list: will be set up (self subscription)

  4. Textbook(s) • A First Course in Database Systems • by Jeff Ullman and Jennifer Widom • Other useful textbooks: • Fundamentals of Database Systems (Elmasri and Navathe) • Foundations of Databases (Abiteboul, Hull and Vianu) • Database Management Systems (Ramakrishnan)

  5. Requirements • Prerequisites: Data structures course (CSE-326 or equivalent). • Work & Grading: • Homework (w/light programming) 25% • Project: 30% • Midterm: 15% • Final: 30%

  6. Real Business: What is a DBMS • Database management systems: • Provide efficient and secure access to large amounts of data. • Address problems such as: • How to store the data • How to query data efficiently • How to update the data securely (by multiple users) • Contrast with using file systems for the same task

  7. Relational Databases • Based on the relational model • Separates the logical view from the physical view of the data.

  8. Querying a Database • Find all the students who have taken CS444 in Fall, 1997. • S(tructured) Q(uery) L(anguage) • select E.name • from Enroll E • where E.course=CS444 and • E.quarter=“Fall, 1997” • Query processor figures out how to answer the query efficiently.

  9. Database Industry • Relational databases are a great success of theoretical ideas. • “Big 3” DBMS companies are among the largest software companies in the world. • IBM (with DB2) and Microsoft (SQL Server, Microsoft Access) are also important players. • $20B industry • Challenged by object oriented DBMS.

  10. Functionality of a DBMS • Storage management • Abstract data model • High level query and data manipulation language • Efficient query processing • Transaction processing • Resiliency: recovery from crashes • Interface with programming languages

  11. Why Use a DBMS? • Data independence and efficient access. • Reduced application development time. • Data integrity and security. • Uniform data administration • Concurrent access and recovery from crashes.

  12. The Study of DBMS • Several aspects: • Modeling and design of databases • Database programming: querying and update operations • Database implementation • DBMS study cuts across many fields of Computer Science: OS, languages, AI, Logic, multimedia, theory...

  13. Course (Rough) Outline • Database design: • Entity Relationship diagrams • ODL (object-oriented design language) • Modeling constraints • The relational model: • Relational algebra • Transforming E/R models to relational schemas

  14. Outline (Continued) • Concepts of data storage • Concepts of query optimization • SQL (“intergalactic dataspeak”) • Concepts and triggers (in SQL) • Concepts of transaction processing • Recursion • Object Query Language • Advanced topics

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