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>Chapter 44. Overview of PostgreSQL Internals</H1
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><B
>Table of Contents</B
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>44.1. <A
HREF="query-path.html"
>The Path of a Query</A
></DT
><DT
>44.2. <A
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>How Connections are Established</A
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>44.3. <A
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>The Parser Stage</A
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>44.3.1. <A
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>Parser</A
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>Transformation Process</A
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>44.4. <A
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>The <SPAN
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>PostgreSQL</SPAN
> Rule System</A
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>44.5. <A
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>Planner/Optimizer</A
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><B
>Author: </B
> This chapter originated as part of
<A
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><I
>Enhancement of the ANSI SQL Implementation of PostgreSQL</I
></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
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> 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.
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