Data Warehousing,An Easy tutorial for beginners

Data warehousing deals with ETL i.e Extraction,transformation and loading
The popular ET"L tools are
Datastage
Cognos for reporting
Business Objects

these tools are used to safeguard the informations of an particular organisation
most tools are not programming languages but of design tools

for example in datastage,
you have


i)server jobs
ii)parallel jobs
iii)mainframe jobs
iv)Sequential jobs


If i want to continue with this tutorial,please comment...........