Use the CDS builder to package the impromptu reposrts, the catalog and all surpporting files, for use with impromptu web reports in a posting folder om IWR server. Then use Impromtu Web Report-Report Administration utility to publish the reports To Upfront Portal, which is web-based cognos...
Why don't you try to create a data mart on either Oracle or Sql. And import the data using DTS package ( you can also schedule the DTS package to feed data on regular base) from multiple DB into one, so that you have a centrilized data source for your Cognos Catalog.
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