Unsupported versions: 6.3
This documentation is for an unsupported version of PostgreSQL.
You may want to view the same page for the current version, or one of the supported versions listed above instead.
Prev Next

Chapter 50. Frontend/Backend Protocol

Table of Contents
Message Data Types
Message Formats

NOTE: Written by Phil Thompson

Postgres uses a message-based protocol for communication between frontends and backends. The protocol is implemented over TCP/IP and also on Unix sockets. Postgres v6.3 introduced version numbers into the protocol. This was done in such a way as to still allow connections from earlier versions of frontends, but this document does not cover the protocol used by those earlier versions.

This document describes the initial version-numbered protocol, designated v1.0. Higher level features built on this protocol (for example, how libpq passes certain environment variables after the connection is established) are covered elsewhere.

Prev Home Next
Genetic Query Optimization in Database Systems Up Overview