Chapter 42. Overview of PostgreSQL Internals
This chapter gives an overview of the internal structure of the
backend of PostgreSQL. After having
read the following sections you should have an idea of how a query
is processed. This chapter does not aim to provide a detailed
description of the internal operation of
PostgreSQL, as such a document would be
very extensive. Rather, this chapter is intended to help the reader
understand the general sequence of operations that occur within the
backend from the point at which a query is received, to the point
at which the results are returned to the client.