201 lines
5.0 KiB
Plaintext
201 lines
5.0 KiB
Plaintext
<!--
|
|
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>
|