Currently the documentation, the way I have interpreted, says, you need two instances on Oracle databases for installing CA DevTest along with Enterprise Dashboard. one each for Registry and Enterprise Dashboard.
We have have found out that, it is sufficient to have following configuration
1. One instance of Oracle Database
2. 1 database schema and associated uses/owner for registry operations
3. 1 database schema and associated user/owner for EnterPrise Dashboard operations.
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Message was edited by: Khagendra Muthe