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<!--
doc/src/sgml/ref/show.sgml
PostgreSQL documentation
-->
<refentry id="sql-show">
<indexterm zone="sql-show">
<primary>SHOW</primary>
</indexterm>
<refmeta>
<refentrytitle>SHOW</refentrytitle>
<manvolnum>7</manvolnum>
<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>
SHOW ALL
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>SHOW</command> will display the current setting of
run-time parameters. These variables can be set using the
<command>SET</command> statement, by editing the
<filename>postgresql.conf</filename> configuration file, through
the <envar>PGOPTIONS</envar> environmental variable (when using
<application>libpq</application> or a <application>libpq</application>-based
application), or through command-line flags when starting the
<command>postgres</command> server. See <xref
linkend="runtime-config"/> for details.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">name</replaceable></term>
<listitem>
<para>
The name of a run-time parameter. Available parameters are
documented in <xref linkend="runtime-config"/> and on the <xref
linkend="sql-set"/> reference page. In
addition, there are a few parameters that can be shown but not
set:
<variablelist>
<varlistentry>
<term><literal>SERVER_VERSION</literal></term>
<listitem>
<para>
Shows the server's version number.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>SERVER_ENCODING</literal></term>
<listitem>
<para>
Shows the server-side character set encoding. At present,
this parameter can be shown but not set, because the
encoding is determined at database creation time.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>LC_COLLATE</literal></term>
<listitem>
<para>
Shows the database's locale setting for collation (text
ordering). At present, this parameter can be shown but not
set, because the setting is determined at database creation
time.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>LC_CTYPE</literal></term>
<listitem>
<para>
Shows the database's locale setting for character
classification. At present, this parameter can be shown but
not set, because the setting is determined at database creation
time.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>IS_SUPERUSER</literal></term>
<listitem>
<para>
True if the current role has superuser privileges.
</para>
</listitem>
</varlistentry>
</variablelist></para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>ALL</literal></term>
<listitem>
<para>
Show the values of all configuration parameters, with descriptions.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
The function <function>current_setting</function> produces
equivalent output; see <xref linkend="functions-admin-set"/>.
Also, the
<link linkend="view-pg-settings"><structname>pg_settings</structname></link>
system view produces the same information.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Show the current setting of the parameter <varname>DateStyle</varname>:
<programlisting>
SHOW DateStyle;
DateStyle
-----------
ISO, MDY
(1 row)
</programlisting>
</para>
<para>
Show the current setting of the parameter <varname>geqo</varname>:
<programlisting>
SHOW geqo;
geqo
------
on
(1 row)
</programlisting>
</para>
<para>
Show all settings:
<programlisting>
SHOW ALL;
name | setting | description
-------------------------+---------+-------------------------------------------------
allow_system_table_mods | off | Allows modifications of the structure of ...
.
.
.
xmloption | content | Sets whether XML data in implicit parsing ...
zero_damaged_pages | off | Continues processing past damaged page headers.
(196 rows)
</programlisting></para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
The <command>SHOW</command> command is a
<productname>PostgreSQL</productname> extension.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-set"/></member>
<member><xref linkend="sql-reset"/></member>
</simplelist>
</refsect1>
</refentry>
|
