ppt

Web 2.0 meets Databases 2.0

Alexandros Labrinidis

Advanced Data Management Technologies LaboratoryDepartment of Computer ScienceUniversity of Pittsburgh

Databases use Relations

• Relational model (proposed in the 70s)

• All data are stored in tables

• Relationships between data also stored in table form

• Operations on tables return tables

ID Make Model Year

1 Toyota Corolla 1988

2Volkswage

nPassat 2004

3 Ford Focus 2002

5 Ford Mustang 2008

6 BMW 325xi 2003

What if we want to make changes?

ID Make Model Year

1 Toyota Corolla 1988

2Volkswage

nPassat 2004

3 Ford Focus 2002

5 Ford Mustang 2008

6 BMW 325xi 2003

ID Make ModelYea

rMade

in

1 Toyota Corolla198

8Japan

2Volkswa

genPassat

2004

Germany

3 Ford Focus200

2USA

5 FordMustan

g200

8USA

6 BMW 325xi200

3German

y

ID Make ModelYea

rMade in Color

1 ToyotaCoroll

a1988

Japan Silver

2Volkswa

genPassat

2004

Germany

3 Ford Focus2002

USA

5 FordMusta

ng2008

USA Blue

6 BMW 325xi2003

Germany

Answer: Semi-structured data (XML)

<cars> <car ID="1"> <make>Toyota</make> <model>Corolla</model> <year>1988</year> </car>

<car ID="2"> <make>Volkswagen</make> <model>Passat</model> <year>2004</year> </car>

...</cars>

<cars> <car ID="1"> <make>Toyota</make> <model>Corolla</model> <year>1988</year> <madein>Japan</madein> </car>

<car ID="2"> <make>Volkswagen</make> <model>Passat</model> <year>2004</year> <madein>Germany</madein> </car>

...</cars>

<cars> <car ID="1"> <make>Toyota</make> <model>Corolla</model> <year>1988</year> <madein>Japan</madein> <color>Silver</color> </car>

<car ID="2"> <make>Volkswagen</make> <model>Passat</model> <year>2004</year> <madein>Germany</madein> </car>

...</cars>

XML Example: RSS Feed

• RSS = Real Simple Syndication

• Simple XML format STANDARD

• Example:

• http://db.cs.pitt.edu

• http://www.google.com (using iGoogle, with http://db.cs.pitt.edu/group/rss/xml )

XML as enabling technology

• Yahoo Pipes: http://pipes.yahoo.com(build simple pipe to process RSS feeds)

• Aggregated News Alertshttp://pipes.yahoo.com/pipes/pipe.info?_id=fELaGmGz2xGtBTC3qe5lkA

• US Population by Statehttp://pipes.yahoo.com/pipes/pipe.info?_id=_Ia89ose3BGMZ6YNlvXiAA

• Mashup: combine data from different sources

• http://www.rockstarapps.com/samples/map-compare/

• http://www.housingmaps.com/

• http://www.zillow.com/

Let’s talk about Blogs

A blog (an abridgment of the term web log) is a website, usually maintained by an individual, with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.

http://en.wikipedia.org/wiki/Blog

Example: http://www.google.com(using iGoogle, with http://behind-the-ene

my-lines.blogspot.com/ )

Analysis Tool: http://www.blogscope.net

Social Networking

• Facebook

• How many of you have a facebook profile? How often to you check it?

• Twitter

• twitter.com/tli_at_pitt

• Power of twitter/social networking: United Breaks Guitars http://bit.ly/z2GU5

• Real-time search

• Trending topics

• Tweets near you (location-aware)

Too many data out there

• Search engines help

• Google

• advanced search:

• google.com alexandros

• google.com alexandros pittsburgh

• google.com/pitt alexandros

• scholar.google.com labrinidis

What happens when you have lots of updates?

• http://www.youtube.com/watch?v=4wp3m1vg06Q

Data Stream Management Systems

Query

Answer

DBMS

data

Data Stream

DSMS

queries

Answer Stream

Examples: google alerts, orbitz traveler alerts

Questions?

Dr. Alexandros LabrinidisAdvanced Data Management Technologies LaboratoryDepartment of Computer Science, University of Pittsburgh

http://db.cs.pitt.edu