CS186: Introduction to Database Systems

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CS186 Introductionto Database SystemsMinos Garofalakisand Joe Hellerstein Queries for Today.
For instance What Database Systems What Database Systems What Database Systems What Database Systems.
What Database Systems So What is a Database We will be broad in our interpretation A Database A very large integrated collection of data .
Typically models a real world enterprise Entities e g teams games Relationships e g The A s are playing in the World Might surprise you how flexible this is Web search .
Entities words documents Relationships word in document document links to P2P filesharing Entities words filenames hosts Relationships word in filename file available at host.
What is a Database Management A Database Management System DBMS A software system designed to store manage and facilitate access to databases Typically this term used narrowly.
Relational databases with transactions E g Oracle DB2 SQL Server Mostly because they predate other largerepositories Also because of technical richness.
When we say DBMS in this class we will usuallyfollow this convention But keep an open mind about applying the ideas What Is the WWW a DBMS Fairly sophisticated search available.
Crawler indexes pages on the web Keyword based search for pages But currently data is mostly unstructured and untyped search only .
can t modify the data can t get summaries complex combinations of data few guarantees provided for freshness of data consistencyacross data items fault tolerance Web sites typically have a relational DBMS in the.
background to provide these functions The picture is changing New standards e g XML Semantic Web can help data Research on combining summarizing data across What Search vs Query.
What if youwanted to find outwhich actorsdonated to Johnpresidential.
Try actorsdonated to johnkerry in yourfavorite search What Search vs Query II.
What if you wanted tofind out whichmusicians donated toJohn Kerry spresidential campaign .
Try musiciansdonated to john kerry in your favorite search If it isn t published .
it can t be What A Database Query Yahoo Actors JOIN FECInfo Courtesy of the Telegraph research group Berkeley .
Q Did it Work What Is a File System a Thought Experiment 1 You and your project partner are editing thesame file .
You both save it at the same time Whose changes survive A Yours B Partner s C Both D Neither E Q How do you write Thought Experiment 2 .
programs over a You re updating a file subsystem when it The power goes out promises you only Which changes survive A Very very carefully A All B None C All Since Last Save D .
OS Support for DataManagement Data can be stored in RAM this is what every programminglanguage offers .
RAM is fast and random access Isn t this heaven Every OS includes a File System manages files on a magnetic disk allows open read seek close on a file.
allows protections to be set on a file drawbacks relative to RAM Database Management What more could we want than a file Simple efficient ad hoc1 queries.
concurrency control recovery benefits of good data modeling S M O P 2 Not really as we ll see this semester.
in fact the OS often gets in the way ad hoc formed or used for specific or immediate problems or needsSMOP Small Matter Of Programming Current Commercial Outlook A major part of the software industry .
Oracle IBM Microsoft also Sybase Informix now IBM Teradata smaller players java based dbms devices OO Well known benchmarks esp TPC Lots of related industries.
data warehouse document management storage backup reporting business intelligence ERP CRM app integration Traditional Relational DBMS products dominant and adapting for extensibility user defined types native XML Microsoft merging file system DB for next OS release .
Open Source coming on strong MySQL PostgreSQL BerkeleyDB And of course the other database technologies Search engines P2P etc What database systems will we.
We will be try to be broad and touch upon Relational DBMS e g Oracle SQL Server DB2 Document search engines e g Google Verity Spotlight Semi structured DB systems e g XML.
repositories like Xindice Starting point We assume you have used web search engines We assume you don t know relational databases Yet they pioneered many of the key ideas.
So focus will be on relational DBMSs With frequent side notes on search engines XML Why take this class A Database systems are at the core of CSB They are incredibly important to society.
C The topic is intellectually richD A capstone course for undergradE It isn t that much workF Looks good on your resumeLet s spend a little time on each of these.
Why take this class A Database systems are the core of CS Shift from computation to information True in corporate computing for years Web p2p made this clear for personal computing.
Increasingly true of scientific computing Need for DB technology has exploded in the last Corporate retail swipe clickstreams customerrelationship mgmt supply chain mgmt datawarehouses etc .
Web not just documents Search engines e commerce blogs wikis other web services Scientific digital libraries genomics satellite imagery physical sensors simulation data Personal Music photo video libraries Email.
archives File contents desktop search Why take this class B DBs are incredibly important to society Knowledge is power Sir Francis Bacon.
With great power comesgreat responsibility SpiderMan s Uncle BenPolicy makers should understand technological possibilities Informed Technologists needed in public discourse on usage .
Why take this class C The topic is intellectually rich representing information data modeling languages and systems for querying data.
complex queries query semantics over massive data sets concurrency control for data manipulation controlling concurrent access ensuring transactional semantics.
reliable data storage maintain data semantics even if you pull the plug semantics the meaning or relationship of meanings of a sign or set of Why take this class D The course is a capstone .
We will see Algorithms and cost analyses System architecture andimplementation Resource management and scheduling.
Computer language design semanticsand optimization Applications of AI topics including logicand planning Statistical modeling of data.
Why take this class E It isn t that much work Bad news It is a lot of work Good news the course is front Most of the hard work is in the first.
half of the semester Load balanced with most other Why take this class F Looks good on my resume Yes but why This is not a course for .
Oracle administrators IBM DB2 engine developers Though it s useful for both It is a course for well educatedcomputer scientists.
Database system concepts and techniquesincreasingly used outside the box Ask your friends at Microsoft Google Apple etc Actually they may or may not realize it A rich understanding of these issues is a.
basic and un fortunately unusual skill Instructors Prof Joe Hellerstein UC Berkeley Dr Minos Garofalakis Intel Research cs186profs db cs berkeley edu.
Tyson Condie Varun Kacholia Benjamin Mellblom How Workload Projects with a real world focus .
Modify the internals of a real open sourcedatabase system PostgreSQL Serious C system hacking Measure the benefits of our changes Build a web based application w PostgreSQL .
Apache PHP SQL PHP Other homework assignments and or Exams 1 Midterm 1 Final Projects to be done in groups of 2 Pick your partner ASAP.
The course is front loaded most of the hard work is in the first half How Administrivia http inst eecs berkeley edu cs... Prof Office Hours .
Hellerstein 685 Soda Hall Tu Th 2 30 3 30 Garofalakis TBA check web page Office Hours TBA check web page Discussion Sections WILL meet this How Administrivia cont .
Textbook Ramakrishnan and Gehrke 3rd Edition Grading hand in policies etc will be on Web Page Cheating policy zero tolerance We have the technology .
Team Projects Teams of 2 Peer evaluations Be honest Feedback is important Trend is more importantthan individual project .
Class bulletin board ucb class cs186 read it regularly and post questions comments mail broadcast to all TAs will not be answered mail to the cs186 course account will not be answered Class Blog for announcements.
For Instance Rest of today free tasting of things tocome in this class data modeling query languages file systems DBMSs.
concurrent fault tolerant data management DBMS architecture We may not get through all of it That s OK we ll see it in more detail later Next Time.
The Relational Model The following mostly from Chapter 1 in R G Describing Data Data Models A data model is a collection ofconcepts for describing data .
A schema is a description of aparticular collection of data usinga given data model Some common data models The relational model of data is the most widely.
used for record keeping Main concept relation basically a table with rows and Every relation has a schema which describes the columns Free text and hypertext widely used as well Data represented for human consumption.
Visual aspects and linguistic subtlety more important thanclearly structured data Semi structured models in increasing use e g XML Main concept self describing tagged document basicallya textual hierarchy tree of labeled values.
Document Type Definition DTD or Schema possible butnot required Levels of Abstraction Views describe how userssee the data .
Conceptual schemadefines logical structure View 1 View 2 View 3 Physical schema Conceptual Schemadescribes the files andindexes used Physical Schema.
sometimes called the DBANSI SPARC architecture Example University Database Data Model Relations Conceptual schema .
Students sid string name string login string age integer gpa real Courses cid string cname string credits integer Enrolled sid string cid string grade string .
Physical schema Relations stored as unordered files Index on first column of Students External Schema View Course info cid string enrollm... .
Data Independence Applications insulated fromhow data is structured and View 1 View 2 View 3 Logical data independence Protection from changes in Conceptual Schema.
logical structure of data Physical Schema Physical data independence Protection from changes inphysical structure of data .
Because rate of change of Q Why are theseparticularly important forDBDBMS applications is incredibly Queries Query Plans and Operators.
SELECT eid SELECT E loc AVG E sal E sal 50KWHERE E eid A eid.
Group agg HAVING Count 5AND P pid A pid JoinAND E loc P loc System handles query.
plan generation optimization ensures Employeescorrect execution AssignmentsIssues view reconciliation operator ordering physical operator choice memorymanagement access path index use .
Concurrency Control Concurrent execution of user programs key togood DBMS performance Disk accesses frequent pretty slow Keep the CPU working on several programs.
concurrently Interleaving actions of different programs e g account transfer print statement at same time DBMS ensures such problems don t arise Users programmers can pretend they are using a.
single user system called Isolation Title: CS186: Introduction to Database Systems Last modified by: Joe Hellerstein Document presentation format: On-screen Show Other titles: Arial Times New Roman Tahoma Times Book Antiqua Osaka Bradley Hand ITC TT-Bold Lucida Sans Unicode Symbol Monotype Sorts lecture1.key CS186: Introduction to Database Systems Queries for Today What: Database Systems Then What: Database Systems Today What ...

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