PostgreSQL

Table of Contents

50.1. The Path of a Query

50.2. How Connections Are Established

50.3. The Parser Stage

50.3.1. Parser

50.3.2. Transformation Process

50.4. The PostgreSQL Rule System

50.5. Planner/Optimizer

50.5.1. Generating Possible Plans

50.6. Executor

This chapter originated as part of [sim98], Stefan Simkovics' Master’s Thesis prepared at Vienna University of Technology under the direction of O.Univ.Prof.Dr. Georg Gottlob and Univ.Ass. Mag. Katrin Seyr.

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.

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