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61e2c00e64
Matthias Schmidt
218 lines
5.9 KiB
Plaintext
218 lines
5.9 KiB
Plaintext
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$PostgreSQL: pgsql/doc/src/sgml/ref/show.sgml,v 1.39 2005/06/14 20:42:52 momjian Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-SHOW">
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<refmeta>
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<refentrytitle id="SQL-SHOW-TITLE">SHOW</refentrytitle>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>SHOW</refname>
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<refpurpose>show the value of a run-time parameter</refpurpose>
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</refnamediv>
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<indexterm zone="sql-show">
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<primary>SHOW</primary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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SHOW <replaceable class="PARAMETER">name</replaceable>
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SHOW ALL
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>SHOW</command> will display the current setting of
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run-time parameters. These variables can be set using the
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<command>SET</command> statement, by editing the
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<filename>postgresql.conf</filename> configuration file, through
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the <envar>PGOPTIONS</envar> environmental variable (when using
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<application>libpq</> or a <application>libpq</>-based
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application), or through command-line flags when starting the
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<command>postmaster</command>. See <xref
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linkend="runtime-config"> for details.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="PARAMETER">name</replaceable></term>
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<listitem>
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<para>
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The name of a run-time parameter. Available parameters are
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documented in <xref linkend="runtime-config"> and on the <xref
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linkend="SQL-SET" endterm="SQL-SET-title"> reference page. In
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addition, there are a few parameters that can be shown but not
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set:
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<variablelist>
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<varlistentry>
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<term><literal>SERVER_VERSION</literal></term>
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<listitem>
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<para>
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Shows the server's version number.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>SERVER_ENCODING</literal></term>
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<listitem>
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<para>
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Shows the server-side character set encoding. At present,
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this parameter can be shown but not set, because the
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encoding is determined at database creation time.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>LC_COLLATE</literal></term>
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<listitem>
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<para>
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Shows the database's locale setting for collation (text
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ordering). At present, this parameter can be shown but not
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set, because the setting is determined at
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<command>initdb</> time.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>LC_CTYPE</literal></term>
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<listitem>
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<para>
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Shows the database's locale setting for character
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classification. At present, this parameter can be shown but
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not set, because the setting is determined at
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<command>initdb</> time.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>IS_SUPERUSER</literal></term>
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<listitem>
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<para>
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True if the current session authorization identifier has
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superuser privileges.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>ALL</literal></term>
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<listitem>
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<para>
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Show the values of all configuration parameters, with descriptions.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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The function <function>current_setting</function> produces
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equivalent output. See <xref linkend="functions-admin">.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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Show the current setting of the parameter <varname>DateStyle</varname>:
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<programlisting>
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SHOW DateStyle;
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DateStyle
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-----------
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ISO, MDY
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(1 row)
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</programlisting>
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</para>
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<para>
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Show the current setting of the parameter <varname>geqo</varname>:
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<programlisting>
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SHOW geqo;
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geqo
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------
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on
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(1 row)
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</programlisting>
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</para>
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<para>
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Show all settings:
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<programlisting>
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SHOW ALL;
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name | setting | description
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--------------------------------+--------------------------------+----------------------------------------------------------------------------------------------
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add_missing_from | off | Automatically adds missing table references to FROM clauses.
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archive_command | unset | WAL archiving command.
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australian_timezones | off | Interprets ACST, CST, EST, and SAT as Australian time zones.
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.
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.
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.
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work_mem | 1024 | Sets the maximum memory to be used for query workspaces.
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zero_damaged_pages | off | Continues processing past damaged page headers.
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(146 rows)
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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The <command>SHOW</command> command is a
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<productname>PostgreSQL</productname> extension.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="SQL-SET" endterm="SQL-SET-title"></member>
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<member><xref linkend="SQL-RESET" endterm="SQL-RESET-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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-->
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