PostgreSQL Tutorial Prev Chapter 1. Introduction Next A Short History of Postgres The Berkeley Postgres Project Implementation of the Postgres DBMS began in 1986. The initial concepts for the system were presented in [STON86] and the definition of the initial data model appeared in [ROWE87]. The design of the rule system at that time was described in [STON87a]. The rationale and architecture of the storage manager were detailed in [STON87b]. Postgres has undergone several major releases since then. The first "demoware" system became operational in 1987 and was shown at the 1988 ACM-SIGMOD Conference. We released Version 1, described in [STON90a], to a few external users in June 1989. In response to a critique of the first rule system ([STON89]), the rule system was redesigned ([STON90b]) and Versio...