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<?xml version='1.0' encoding='ISO-8859-1'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
<!ENTITY dhfirstname "<firstname>Peter</firstname>">
<!ENTITY dhsurname "<surname>Eisentraut</surname>">
<!-- Please adjust the date whenever revising the manpage. -->
<!ENTITY dhdate "<date>March 7, 2004</date>">
<!ENTITY dhsection "<manvolnum>1</manvolnum>">
<!ENTITY dhemail "<email>peter_e@gmx.net</email>">
<!ENTITY dhusername "Peter Eisentraut">
<!ENTITY dhucpackage "<refentrytitle>RHDB-EXPLAIN</refentrytitle>">
<!ENTITY dhpackage "rhdb-explain">
<!ENTITY debian "<application>Debian</application>">
<!ENTITY gnu "<acronym>GNU</acronym>">
<!ENTITY gpl "&gnu; <acronym>GPL</acronym>">
]>
<refentry>
<refentryinfo>
<address>
&dhemail;
</address>
<author>
&dhfirstname;
&dhsurname;
</author>
<copyright>
<year>2004</year>
<holder>&dhusername;</holder>
</copyright>
&dhdate;
</refentryinfo>
<refmeta>
&dhucpackage;
&dhsection;
</refmeta>
<refnamediv>
<refname>&dhpackage;</refname>
<refpurpose>A tool for visualizing the output of the <application>PostgreSQL</application> <command>EXPLAIN</command> command</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>&dhpackage;</command>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para>This manual page documents briefly the
program <command>&dhpackage;</command>.</para>
<para>This manual page was written for the &debian; distribution
because the original program does not have a manual page.</para>
<para><command>&dhpackage;</command> is Visual Explain, an interactive tool for
visualizing the output of the <application>PostgreSQL</application>
<command>EXPLAIN</command> and <command>EXPLAIN ANALYZE</command>
commands. <command>EXPLAIN</command> and
<command>EXPLAIN ANALYZE</command> show the users the query plan
that a <application>PostgreSQL</application> backend produces for a
given optimizable query. The default form of this plan is a
plain-text tree, which, while easy to read for simple queries,
becomes progressilvely more difficult to interpret as query complexity
increases. By visualizing the text output of
<command>EXPLAIN</command>/<command>EXPLAIN ANALYZE</command> in an
appropriate manner, the difficulty of interpreting query plans
drops significantly.</para>
</refsect1>
<refsect1>
<title>AUTHOR</title>
<para>This manual page was written by &dhusername; &dhemail; for
the &debian; system (but may be used by others).</para>
</refsect1>
</refentry>
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