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Other databases supported by Hibernate may work, but it is likely that you will need to edit the SQL generated for creation of the schema. A list of databases supported by hibernate can be found at http://community.jboss.org/wiki/SupportedDatabases.
Each database is equal as far as Grouper is concerned, with no functionality tied to, or excluded from, any specific database. You choice will be based on factors such as:
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