How can I apply a database change across many instances concurrently?

In support of a nationwide imaging application that will place HP UNIX servers housing Oracle instances in over 100 offices across the country, we're looking for the most efficient way to apply (distribute, execute, and validate) our database releases to all Oracle instances on the same day. Given a limited number of DBAs (3 or 4) and such a large number of instances located throughout the country, an automated solution is mandatory. Is there a tool or methodology available to handle this task?
Assumptions: the database structure across all Oracle instances will be identical and each database release (series of SQL scripts) will be consistent across all instances.
Thanks in advance!

Thanks for your response. We're looking for a solution that will allow us to apply changes to the database structures (tables, indexes, procedures, privileges, tablespaces, etc...) via DDL without changing the underlying data. Each of the sites we'll need maintain will have their own unique data. Replicating the data is not an option. We are in search of a solution that allows us to apply a database structure change across many sites at one time without updating the underlying data.
- Mitch

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