Is Red Hat making a play for the open source database market? Linux leader Red Hat (NYSE:RHT) is investing in open source database vendor EnterpriseDB, the official announcement is set for release on Tuesday October 27th. The official press release does not disclose the exact amount that Red Hat is investing, but it is part of a $19M series C round of funding. EnterpriseDB is one of the leading commercial backers behind the PostgreSQL(also known as Postgres) database. While the Red Hat investment in EnterpriseDB maybe new, EnterpriseDB and Red Hat are hardly strangers. EnterpriseDB's president Ed Boyajian is a former Red Hat exec. Red Hat is also no stranger to PostgreSQL either.