As Don says, there will be a framework within ACS 5 for supporting multiple databases. I, and I doubt I'm alone here at aD, have significant interest in seeing a PostgreSQL version of ACS 5, but not resources. What I would like to see happen is that we develop a framework, implement it for Oracle, and leave clear directions on how to fill in the Postgres version. Then as people develop the Postgres implementation we can roll it into the distribution. I think this strikes the right balance and provides a way for the community to contribute in an open way, but I'm interested in opinions on this issue.
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One idea that several people have tossed around is that we might use Postgres as a "default" database when the ACS is installed, with an option to override and use Oracle, or any other database we support in the future.
