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>Chapter 44. Overview of PostgreSQL Internals</H1
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>Table of Contents</B
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>44.1. <A
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>The Path of a Query</A
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>44.2. <A
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>How Connections are Established</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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>44.3.2. <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
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> Rule System</A
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>Planner/Optimizer</A
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>44.6. <A
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>Executor</A
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CLASS="NOTE"
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>Author: </B
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>    This chapter originated as part of
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    <A
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HREF="biblio.html#SIM98"
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><I
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>Enhancement of the ANSI SQL Implementation of PostgreSQL</I
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>, Stefan Simkovics'
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    Master's Thesis prepared at Vienna University of Technology under the direction
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    of O.Univ.Prof.Dr. Georg Gottlob and Univ.Ass. Mag. Katrin Seyr.
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   </P
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>   This chapter gives an overview of the internal structure of the
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   backend of <SPAN
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>PostgreSQL</SPAN
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>.  After having
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   read the following sections you should have an idea of how a query
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   is processed. This chapter does not aim to provide a detailed
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   description of the internal operation of
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   <SPAN
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>PostgreSQL</SPAN
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>, as such a document would be
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   very extensive. Rather, this chapter is intended to help the reader
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   understand the general sequence of operations that occur within the
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   backend from the point at which a query is received, to the point
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   at which the results are returned to the client.
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