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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:18:09 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:18:09 +0000
commitebe124eacd7c3faa36ed358e7cc1d7c5b419e5f6 (patch)
tree48fe9c3270176faa25c7d9fb47326f689be82fe4 /doc/src/sgml/html/geqo-intro.html
parentReleasing progress-linux version 15.5-0+deb12u1~progress6.99u1. (diff)
downloadpostgresql-15-ebe124eacd7c3faa36ed358e7cc1d7c5b419e5f6.tar.xz
postgresql-15-ebe124eacd7c3faa36ed358e7cc1d7c5b419e5f6.zip
Merging upstream version 15.6.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!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>62.1. Query Handling as a Complex Optimization Problem</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="geqo.html" title="Chapter 62. Genetic Query Optimizer" /><link rel="next" href="geqo-intro2.html" title="62.2. Genetic Algorithms" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">62.1. Query Handling as a Complex Optimization Problem</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Up</a></td><th width="60%" align="center">Chapter 62. Genetic Query Optimizer</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="geqo-intro2.html" title="62.2. Genetic Algorithms">Next</a></td></tr></table><hr /></div><div class="sect1" id="GEQO-INTRO"><div class="titlepage"><div><div><h2 class="title" style="clear: both">62.1. Query Handling as a Complex Optimization Problem</h2></div></div></div><p>
+<!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>62.1. Query Handling as a Complex Optimization Problem</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="geqo.html" title="Chapter 62. Genetic Query Optimizer" /><link rel="next" href="geqo-intro2.html" title="62.2. Genetic Algorithms" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">62.1. Query Handling as a Complex Optimization Problem</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Up</a></td><th width="60%" align="center">Chapter 62. Genetic Query Optimizer</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="geqo-intro2.html" title="62.2. Genetic Algorithms">Next</a></td></tr></table><hr /></div><div class="sect1" id="GEQO-INTRO"><div class="titlepage"><div><div><h2 class="title" style="clear: both">62.1. Query Handling as a Complex Optimization Problem</h2></div></div></div><p>
Among all relational operators the most difficult one to process
and optimize is the <em class="firstterm">join</em>. The number of
possible query plans grows exponentially with the
@@ -33,4 +33,4 @@
<em class="firstterm">genetic algorithm</em> to solve the join
ordering problem in a manner that is efficient for queries
involving large numbers of joins.
- </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="geqo-intro2.html" title="62.2. Genetic Algorithms">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 62. Genetic Query Optimizer </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 62.2. Genetic Algorithms</td></tr></table></div></body></html> \ No newline at end of file
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="geqo.html" title="Chapter 62. Genetic Query Optimizer">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="geqo-intro2.html" title="62.2. Genetic Algorithms">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 62. Genetic Query Optimizer </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 62.2. Genetic Algorithms</td></tr></table></div></body></html> \ No newline at end of file