I am from Brazil and i work for a little company and it company is working is medium-big project and we want to use PostGree like the DataBase system, but i got some questions. I want to know if the PostGree has limitations about the concurrent access, because a lot of people will access this database at the same time. I want to know about the limitations, like how much memory do i have to use !? How big could be my database and how simultaneously access this database support ?