With interest in PostgreSQL exploding, EnterpriseDB has chosen the private equity route to expand its business. The company is being acquired by Boston-area PE firm Great Hill Partners, with existing EnterpriseDB investment firm Catalyst Investors retaining a minority stake. The deal was announced at the company's annual user conference today, an event where serial database inventor, Turing Award winner, and MIT Professor Dr. Michael Stonebraker gave a keynote rich with database history.