danielfountain (5/17/2013)
We currently have multiple systems that we report on. They all contain information on the same topic - but they are systems built externally by different companies.However one major goal is to be able to report on these systems together.
if all systems are on the same topic then it looks to me the sensible thing to do is to build a single datamart data warehouse.
I would focus on the design of the single datamart e.g. the FACT and DIM tables that would store the data then I would plan the ETL processes. Most probably I would create staging tables mimicking as close as possible what you have on the operational systems then define how to map such data into the data warehouse.
Hope this helps.
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Pablo (Paul) Berzukov
Author of Understanding Database Administration available at Amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.