I haven't heard of a link between Firebird and PostgreSQL with regards to MVCC before. I remember using PostgreSQL 6.5 with MVCC on a project back in 1999, but

I haven't heard of a link between Firebird and PostgreSQL with regards to MVCC before. I remember using PostgreSQL 6.5 with MVCC on a project back in 1999, but Borland didn't open-source InterBase (as Firebird) until after that project. Are you saying PostgreSQL "pretty much copied" the concept of MVCC, or some specific implementation? I thought MVCC was decades old by 1999.