sql server - Java/.NET Developer moving towards Data Warehouse -

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i understand concept of data warehouse after reading questions this: what data warehouse?. familiar olap , mdx (mdx limited extent).

i have .net application connects fifteen different databases search information , manage information i.e. java application connects fifteen databases oracle/sql based. believe data warehouse meet needs. have 2 questions data warehouses:

  1. do copy data needed make decision data warehouse (using ssis) or leave in oltp systems , query or bit of both?
  2. what use user interface? java app/vb.net perhaps

a data warehouse reformatted version of transactional database intended fast access, providing business insight end users (technical , non-technical). example, datawarehouse in kimball model denormalized (think tall , skinny) version of transaction database in star schema. data taken oltp database, goes through etl process (extract, transform, load), , made available business users (for end-user ui querying la business objects, example).

there many, many variations on this. served @ articles on basic kimball-style datawarehouses (and i'm not trying biased, it's i've used in past). there edition used kimball warehousing books on amazon pennies, if feel need physical book.


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