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PostgreSQL (Postgres) is an open source database developed and maintained by an open source online community. Postgres is a relational database management system that provides a comparable level of functionality, scalability and performance with DB2, informix, SQL Server or Oracle. The implementation of ArcSDE supports full geodatabase funcionality. You and your users can perform any work flow on ArcSDE for Postgres. You also have all the database functionality at your disposal: creating topologies and geometric networks, versioning, archiving, replication and relationship classes.
You will be able to use any ArcGIS client application to interract with data stored in Postgres.