ICT role in 21st century education and it's challenges.
Lecture 10 The Data Warehouse and the Web
1. Building Data WareHouse
by Inmon
Chapter 10: The Data Warehouse and the Web
http://it-slideshares.blogspot.com/
2. 10. The Data Warehouse and the
Web1. Introduction
2. Supporting the eBusiness Environment
3. Moving Data from the Web to the DW
4. Moving Data from the DW to the Web
5. Web Support
6. Summary
http://it-slideshares.blogspot.com
3. 10.1 Introduction
There is a very strong affinity between
the Web sites built by organizations
and the data warehouse.
Data warehousing provides the
foundation for the successful
operation of a Web-based eBusiness
environment.
http://it-slideshares.blogspot.com
4. 10.1 Introduction (ct.)
The Web environment interacts with
corporate systems in two basic ways:
◦ When the Web environment creates a
transaction that needs to be executed.
◦ Through the collection of Web activity in a
log (or clickstream data)
5. 10.1 Introduction (ct.)
The process of moving data from the Web
into the data warehouse:
◦ Web data is collected into a log.
◦ The log data is processed by passing
through a Granularity Manager.
◦ The Granularity Manager then passes the
refined data into the data warehouse.
6. 10.1 Introduction (ct.)
The ODS
◦ is a hybrid structure that
has some aspects of a
data warehouse and
other aspects of an
operational system.
◦ contains integrated data
and can support DSS
processing.
◦ Can also support high-
performance transaction
processing.
7. 10.1 Introduction (ct.)
The ODS and
the data
warehouse
hold different
kinds of data:
◦ ODS: profile
data
◦ DW: detailed
transaction
9. 10.1 Introduction (ct.)
Another important aspect of the data
warehouse is its ability to support
multiple Web sites.
10. 10.2 Supporting the eBusiness
Environment
The data warehouse can service more
than one eBusiness
11. 10.3 Moving Data from the
Web to the Data Warehouse
The sorts of things that are done to
the data in the Web environment
before becoming useful in the data
warehouse:
◦ Extraneous data is removed.
◦ Like occurrences of data are added
together.
◦ Data is resequenced.
◦ Data is edited.
◦ Data is cleansed.
◦ Data is converted.
12. 10.4 Moving Data from the
Data Warehouse to the Web
The Web environment is very
sensitive to response time -> no direct
interface between the DW and the
Web environment.
Instead, the interface between the two
environments passes through the
corporate ODS residing in the same
environment as the DW.
13. 10.5 Web Support
The data warehouse provides several
important capabilities:
◦ The ability to absorb huge amounts of
data
◦ Access to integrated data
◦ The ability to provide very good
performance
14. 10.6 Summary
The Web environment is supported by the data
warehouse in a variety of ways.
The interface for moving data from the Web to the
data warehouse is fairly simple: web
logs, Granularity Manager..
The interface for moving data from the warehouse
to the Web is a little more complex: ODS, profile
records..
The DW provides a place where massive amounts
of data can be downloaded from the Web
environment and stored.
The data warehouse also provides a central point
where corporate data can be merged and
integrated. http://it-slideshares.blogspot.com
