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This paper has been superseded by Composite Information Server for Netezza (September, 2011)

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It is often the case in large enterprises that
multiple data marts are deployed, along with
a central enterprise data warehouse acting
as a system of record. While these data marts
serve the requirements of the departments
or divisions that implement them, a frequent
requirement is to merge data across these
implementations. While this can be done by
replicating the data across systems, this is an
expensive and inflexible option. A preferred
solution is to use federated technology that
will support queries across systems. This is
what Netezza Data Virtualizer does. It also
supports other use cases but this will be the
primary one for most companies.

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