We are in the process of determining the best approach to update our data structure supporting our OLAP solutions from it's current structure of flat files to a data mart or data warehouse structure. We have found it very difficult to determine whether we should build an ETL tool ourselves or use one of the many products that exist today. Do you have any recommendations as to the effectiveness of building your own ETL tool or buying an existing tool? Which ETL products are best for extracting data from many different transactional based systems.
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