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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/show.sgml,v 1.22 2002/10/13 16:55:05 tgl Exp $
PostgreSQL documentation
-->
<refentry id="SQL-SHOW">
<refmeta>
<refentrytitle id="SQL-SHOW-TITLE">SHOW</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>SHOW</refname>
<refpurpose>show the value of a run-time parameter</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis>
SHOW <replaceable class="PARAMETER">name</replaceable>
</synopsis>
<synopsis>
SHOW ALL
</synopsis>
<refsect2 id="R2-SQL-SHOW-1">
<title>Inputs</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">name</replaceable></term>
<listitem>
<para>
The name of a run-time parameter. See
<xref linkend="sql-set" endterm="sql-set-title">
for a list.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>ALL</term>
<listitem>
<para>
Show all current session parameters.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-SHOW-1">
<title>Description</title>
<para>
<command>SHOW</command> will display the current setting of a
run-time parameter. These variables can be set using the
<command>SET</command> statement, by editing the
<filename>postgresql.conf</filename>, through the
<envar>PGOPTIONS</envar> environmental variable, or through a
command-line flag when starting the
<application>postmaster</application>.
</para>
<para>
Even with <literal>autocommit</> set to <literal>off</>, <command>SHOW</>
does not start a new transaction block. See the
<literal>autocommit</> section of the <citetitle>Administrator's
Guide</citetitle> for details.
</para>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>ERROR: Option '<replaceable>name</replaceable>'
is not recognized</computeroutput></term>
<listitem>
<para>
Message returned if <replaceable>name</replaceable> does
not stand for an existing parameter.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 id="R1-SQL-SHOW-2">
<title>Examples</title>
<para>
Show the current <literal>DateStyle</literal> setting:
<programlisting>
SHOW DateStyle;
DateStyle
---------------------------------------
ISO with US (NonEuropean) conventions
(1 row)
</programlisting>
</para>
<para>
Show the current genetic optimizer (<literal>geqo</literal>) setting:
<programlisting>
SHOW GEQO;
geqo
------
on
(1 row)
</programlisting>
</para>
<para>
Show all settings:
<programlisting>
SHOW ALL;
name | setting
-------------------------------+---------------------------------------
australian_timezones | off
authentication_timeout | 60
checkpoint_segments | 3
.
.
.
wal_debug | 0
wal_sync_method | fdatasync
(94 rows)
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-SHOW-3">
<title>Compatibility</title>
<para>
The <command>SHOW</command> command is a
<productname>PostgreSQL</productname> extension.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
The function <function>current_setting</function> produces equivalent
output. See <citetitle>Miscellaneous Functions</citetitle> in the
<citetitle>PostgreSQL User's Guide</citetitle>.
</para>
</refsect1>
</refentry>
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