Introduction to Database Systems - EPFL

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Introduction toInformation SystemsSSC Semester 6Lecture 01 Instructors .
Karl Aberer BC 108 karl aberer at epfl ch Philippe Cudr Mauroux BC 114 philippe cudre maurouxat epfl ch Office hours by appointment Gleb Skobeltsyn exercises .
Martin Rubli project Communications Web page lsirww epfl ch Lectures will be available here Homeworks and solutions will be posted here.
The project description and resources will be here Newsgroup epfl ic cours IIS TextbookMain textbook .
Databases and Transaction Processing An application oriented approachPhilip M Lewis Arthur Bernstein MichaelKifer Addison Wesley 2002 Other Texts.
Many classic textbooks each of them will do it Database Systems The Complete Book Hector Garcia Molina Jeffrey Ullman Jennifer Widom Database Management Systems Ramakrishnan Fundamentals of Database Systems Elmasri Navathe.
Database Systems Date 7 edition Modern Database Management Hoffer 4 edition Database Systems Concepts Silverschatz 4 edition Material on the Web SQL for Web Nerds by Philip Greenspun .
http philip greenspun com sql Java Technology java sun comWWW Technology www w3c org.
The Course Goal Teaching RDBMS standard with astrong emphasis on the Web Fortunately others already did it Alon Halevy Dan Suciu Univ of Washington.
http www cs washington edu edu... courses cse444 http www acm org sigmod record... 0309 4 AlonLevy pdf Acknowledgement.
Build on UoW course many slides many exercise ideas for the project Main difference.
less theory will use real Web data in the project Outline for Today s Lecture Overview of database systems Course Outline.
First Steps in SQL What is behind this Web Site http immo search ch Search on a large database Specify search conditions.
Many users Updates Access through a web interface Database Management SystemsDatabase Management System DBMS.
A collection of files that store the data A big C program written by someone elsethat accesses and updates those files for youRelational DBMS RDBMS Data files are structured as relations tables .
Where are RDBMS used Backend for traditional database applications EPFL administration Backend for large Websites.
Immosearch Backend for Web services Amazon Example of a TraditionalDatabase Application.
Suppose we are building a systemto store the information about students courses professors.
who takes what who teaches what Can we do it without a DBMS Sure we can Start by storing the data in files students txt courses txt professors txtNow write C or Java programs to implement.
specific tasks Doing it without a DBMS Enroll Mary Johnson in CSE444 Write a C Java program to do the following Read students txt .
students txt Read courses txt courses txt Find updateFind update the.
the recordrecord Mary Mary Johnson Johnson Find update.
Find update thethe recordrecord CSE444 CSE444 Write students txt .
students txt Write courses txt courses txt Problems without an DBMS System crashes Read students txt .
Read students txt Read courses txt Read courses txt Find updateFind updatethe.
Find updaterecord Mary MaryJohnson Johnson CSE444 .
Find update the record CSE444 Write students txt students txt Write courses txt Write courses txt .
What is the problem Large data sets say 50GB Why is this a problem Simultaneous access by many users Lock students txt what is the problem .
Enters a DBMS Two tier system or client server connection ODBC JDBC Database server.
someone else sData files C program Applications Functionality of a DBMSThe programmer sees SQL which has two components Data Definition Language DDL.
Data Manipulation Language DML query languageBehind the scenes the DBMS has Query engine Query optimizer.
Storage management Transaction Management concurrency recovery How the Programmer Sees the Start with DDL to create tables CREATETABLE TABLEStudents.
Students NameCHAR 30 SSNCHAR 9 CHAR 9 PRIMARYPRIMARYKEY.
CategoryCHAR 20 Continue with DML to populate tables INSERTINTO INTOStudentsVALUES Charles .
VALUES Charles 123456789 123456789 undergraduate undergraduate How the Programmer Sees the.
Tables Students Takes SSN Name Category SSN CID123 45 6789 Charles undergrad 123 45 6789 CSE444234 56 7890 Dan grad 123 45 6789 CSE444.
234 56 7890 CSE142Courses CID Name QuarterCSE444 Databases fallCSE541 Operating systems winter.
Still implemented as files but behind the scenes canbe quite complex data independence separate logical viewfrom physical implementation 20 Transactions.
Enroll Mary Johnson in CSE444 BEGINTRANSACTION TRANSACTION INSERTINTOSELECTStudents SSN .
Students SSN Courses CIDCourses CIDFROMStudents Students CoursesWHEREStudents name.
Students name Mary MaryJohnson Johnson andCourses nameCourses name CSE444 .
CSE444 Moreupdatesupdateshere IFeverything went OKeverything went OK.
THENCOMMIT ELSEROLLBACKIf system crashes the transaction is still either committed or aborted Transactions A transaction sequence of statements that either.
all succeed or all fail Transactions have the ACID properties A atomicity a transaction should be done or undone completely C consistency a transaction should transform a system from oneconsistent state to another consistent state .
I isolation each transaction should happen independently of othertransactions D durability completed transactions should remain permanent Find all courses that Mary takesSELECT C name.
FROM StudentsStudents S T CoursesCourses CCWHERE S name Mary .
S name Mary andandS ssn T ssnT cid C cid What happens behind the scene Query processor figures out how to answer the.
query efficiently Queries behind the sceneDeclarative SQL query Imperative query execution plaSELECT C nameFROMStudents.
StudentsS WHERES name Mary S name Mary andand cid cidS ssn T ssnT cid C cid.
name Mary Students Takes CoursesThe optimizer chooses the best execution plan for a query 24 Database Systems The big commercial database vendors .
Oracle IBM with DB2 Microsoft SQL Server Sybase Some free database systems Unix .
Postgres Predator Databases and the Web Accessing databases through web interfaces Java programming interface JDBC .
Embedding into HTML pages JSP Access through http protocol Web Services Using Web document formats for datadefinition and manipulation XML Xquery Xpath.
XML databases and messaging systems Database Integration Combining data from different databases collection of data wrapping combination of data and generation of new views on the.
data mediation Problem heterogeneity access representation content Example revisited http immo search ch .
http www swissimmo ch Other Trends in Databases Industrial Object relational databases Main memory database systems.
Data warehousing and mining Research Peer to peer data management Stream data management Mobile data management.
Course Outline Details on the Web SQL Chapter 6 The relational data model Chapter 3 Database design Chapters 2 3 7 .
XML XPath XQuery Indexes Chapter 13 Transactions and Recovery Chapter 17 18 Structure Prerequisites .
Programming courses Data structures Work Grading Homeworks 4 0 Exam like homeworks 50 .
Project 50 see next each phase graded separately The Project Models the real data management needs of a Web Phase 1 Modelling and Data Acquisition Phase 2 Data integration and Applications.
Phase 3 Services One can only start to appreciate database systemsby actually trying to use one Halevy Any SW IT company will love you for these skills The Project Side Effects.
Trains your soft skills team work deal with bugs poor documentation produce with limited time resources project management and reporting.
Results useful for you personally Project should be fun Practical Concerns New course expect some hickups Important to keep time schedule.
Communication through Web Newsgroup Student committee for regular feedback 2 volunteers Week Date Lecture Exercise Project Deadlines.
1 11 03 2005 Introduction Basic SQL Project Presentation2 18 03 2005 Advanced SQL Ex 1 SQL on machines 25 03 2005 Easter01 04 2005 Easter3 08 04 2005 Conceputal Modelling Correction Ex 1.
4 15 04 2005 Database Programming5 22 04 2005 Functional Dependencies Ex 2 FD and RA Phase 16 29 04 2005 Relational Algebra7 06 05 2005 Introduction to XML Corr Ex 2 Ex 3 XML8 13 05 2005 XML Query Phase 2.
9 20 05 2005 Web Services Correction Ex 310 27 05 2005 Concurrency Ex 4 Transactions11 03 06 2005 Recovery08 06 2005 Phase 312 10 06 2005 Database Heterogeneity Correction Ex 4.
13 17 06 2005 Indexing So what is this course about A bit of everything Languages SQL XPath XQuery Data modeling.
Theory Functional dependencies normal Algorithms and data structures in the second half Lots of implementation and hacking for the Most importantly how to meet Real World needs.
Introduction to Information Systems SSC, Semester 6 Lecture 01 Staff Instructors: Karl Aberer, BC 108, karl aberer at epfl ch Philippe Cudré-Mauroux, BC 114, philippe cudre-mauroux at epfl ch Office hours: by appointment TAs: Gleb Skobeltsyn (exercises) Martin Rubli (project) Communications Web page: lsirww.epfl.ch Lectures will be available here Homeworks and solutions will be posted here ...

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