Yahoo had a huge postgres database a few years ago. No idea what they are doing now. http://www.computerworld.com/s/article/9087918/Size_matters_Yahoo_claims_2_

Yahoo had a huge postgres database a few years ago. No idea what they are doing now. http://www.computerworld.com/s/article/9087918/Size_matters_Yahoo_claims_2_petabyte_database_is_world_s_biggest_busiest http://www.computerworld.com/s/article/9087918/Size_matters_... And Skype sounds pretty interesting too. http://www.slideshare.net/adorepump/small-overview-of-skype-database-tools http://www.slideshare.net/adorepump/small-overview-of-skype-...