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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 51. Overview of PostgreSQL Internals</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="internals.html" title="Part VII. Internals" /><link rel="next" href="query-path.html" title="51.1. The Path of a Query" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 51. Overview of PostgreSQL Internals</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="internals.html" title="Part VII. Internals">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="internals.html" title="Part VII. Internals">Up</a></td><th width="60%" align="center">Part VII. Internals</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="query-path.html" title="51.1. The Path of a Query">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="OVERVIEW"><div class="titlepage"><div><div><h2 class="title">Chapter 51. Overview of PostgreSQL Internals</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="query-path.html">51.1. The Path of a Query</a></span></dt><dt><span class="sect1"><a href="connect-estab.html">51.2. How Connections are Established</a></span></dt><dt><span class="sect1"><a href="parser-stage.html">51.3. The Parser Stage</a></span></dt><dd><dl><dt><span class="sect2"><a href="parser-stage.html#id-1.10.3.6.3">51.3.1. Parser</a></span></dt><dt><span class="sect2"><a href="parser-stage.html#id-1.10.3.6.4">51.3.2. Transformation Process</a></span></dt></dl></dd><dt><span class="sect1"><a href="rule-system.html">51.4. The <span class="productname">PostgreSQL</span> Rule System</a></span></dt><dt><span class="sect1"><a href="planner-optimizer.html">51.5. Planner/Optimizer</a></span></dt><dd><dl><dt><span class="sect2"><a href="planner-optimizer.html#id-1.10.3.8.5">51.5.1. Generating Possible Plans</a></span></dt></dl></dd><dt><span class="sect1"><a href="executor.html">51.6. Executor</a></span></dt></dl></div><div class="note"><h3 class="title">Author</h3><p>
This chapter originated as part of
<a class="xref" href="biblio.html#SIM98" title="Enhancement of the ANSI SQL Implementation of PostgreSQL">[sim98]</a>, 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.
</p></div><p>
This chapter gives an overview of the internal structure of the
backend of <span class="productname">PostgreSQL</span>. 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
<span class="productname">PostgreSQL</span>, 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.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="internals.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="internals.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="query-path.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Part VII. Internals </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 51.1. The Path of a Query</td></tr></table></div></body></html>
