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Need information about JAVA/J2EE/DWH

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I am new to J2EE , and I want to get information about it. Can anyone guide me what is DWH in JAVA/J2EE and can you provide me any help .
Thank you
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DWH stands for Data Warehousing. Don't know much about the details, though.
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One of my colleague here gave me this information :
The foll. are the top products in the market used for Datawarehousing :
In Datawarehousing :
1.Data stores can be:Informix,DB2,Oracle,Nucleus,Teradata, SQL Server

2. Popular ETL Tools(For populating Data warehouse): Ascential , Informatica and Abinitio , Sagent and Data stage

3. Datamodelling tools : Erwin,Oracle Designer,ER Studio

4. Reporting/Analysis tools: Business Objects, hyperion , cogsos, brio, spss , crystal reports
I do not know what kind of support they have for J2EE.
For example, his company uses the following for their Datawarehousing project involving, almost 2 million customer's data :
DB Source : Oracle 9i
DB Data warehouse : Nucleus
ETL : Ab initio
Reporting (ODS) : Brio
I don't like that guy. The tiny ad agrees with me.
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