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Green_GoodERP18_FSJ_Standard/PostgreSQL/doc/postgresql/html/sql-show.html

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  1. <?xml version="1.0" encoding="UTF-8" standalone="no"?>

  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>SHOW</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="sql-set-transaction.html" title="SET TRANSACTION" /><link rel="next" href="sql-start-transaction.html" title="START TRANSACTION" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">SHOW</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-set-transaction.html" title="SET TRANSACTION">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-start-transaction.html" title="START TRANSACTION">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-SHOW"><div class="titlepage"></div><a id="id-1.9.3.178.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">SHOW</span></h2><p>SHOW — show the value of a run-time parameter</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">

  3. SHOW <em class="replaceable"><code>name</code></em>

  4. SHOW ALL

  5. </pre></div><div class="refsect1" id="id-1.9.3.178.5"><h2>Description</h2><p>

  6.    <code class="command">SHOW</code> will display the current setting of

  7.    run-time parameters. These variables can be set using the

  8.    <code class="command">SET</code> statement, by editing the

  9.    <code class="filename">postgresql.conf</code> configuration file, through

  10.    the <code class="envar">PGOPTIONS</code> environmental variable (when using

  11.    <span class="application">libpq</span> or a <span class="application">libpq</span>-based

  12.    application), or through command-line flags when starting the

  13.    <code class="command">postgres</code> server.  See <a class="xref" href="runtime-config.html" title="Chapter 19. Server Configuration">Chapter 19</a> for details.

  14.   </p></div><div class="refsect1" id="id-1.9.3.178.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>

  15.       The name of a run-time parameter.  Available parameters are

  16.       documented in <a class="xref" href="runtime-config.html" title="Chapter 19. Server Configuration">Chapter 19</a> and on the <a class="xref" href="sql-set.html" title="SET"><span class="refentrytitle">SET</span></a> reference page.  In

  17.       addition, there are a few parameters that can be shown but not

  18.       set:

  19. 

  20.       </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">SERVER_VERSION</code></span></dt><dd><p>

  21.           Shows the server's version number.

  22.          </p></dd><dt><span class="term"><code class="literal">SERVER_ENCODING</code></span></dt><dd><p>

  23.           Shows the server-side character set encoding.  At present,

  24.           this parameter can be shown but not set, because the

  25.           encoding is determined at database creation time.

  26.          </p></dd><dt><span class="term"><code class="literal">LC_COLLATE</code></span></dt><dd><p>

  27.           Shows the database's locale setting for collation (text

  28.           ordering).  At present, this parameter can be shown but not

  29.           set, because the setting is determined at database creation

  30.           time.

  31.          </p></dd><dt><span class="term"><code class="literal">LC_CTYPE</code></span></dt><dd><p>

  32.           Shows the database's locale setting for character

  33.           classification.  At present, this parameter can be shown but

  34.           not set, because the setting is determined at database creation

  35.           time.

  36.          </p></dd><dt><span class="term"><code class="literal">IS_SUPERUSER</code></span></dt><dd><p>

  37.           True if the current role has superuser privileges.

  38.          </p></dd></dl></div></dd><dt><span class="term"><code class="literal">ALL</code></span></dt><dd><p>

  39.       Show the values of all configuration parameters, with descriptions.

  40.      </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.178.7"><h2>Notes</h2><p>

  41.    The function <code class="function">current_setting</code> produces

  42.    equivalent output; see <a class="xref" href="functions-admin.html" title="9.26. System Administration Functions">Section 9.26</a>.

  43.    Also, the

  44.    <a class="link" href="view-pg-settings.html" title="51.86. pg_settings"><code class="structname">pg_settings</code></a>

  45.    system view produces the same information.

  46. 

  47.   </p></div><div class="refsect1" id="id-1.9.3.178.8"><h2>Examples</h2><p>

  48.    Show the current setting of the parameter <code class="varname">DateStyle</code>:

  49. 

  50. </p><pre class="programlisting">

  51. SHOW DateStyle;

  52.  DateStyle

  53. -----------

  54.  ISO, MDY

  55. (1 row)

  56. </pre><p>

  57.   </p><p>

  58.    Show the current setting of the parameter <code class="varname">geqo</code>:

  59. </p><pre class="programlisting">

  60. SHOW geqo;

  61.  geqo

  62. ------

  63.  on

  64. (1 row)

  65. </pre><p>

  66.   </p><p>

  67.    Show all settings:

  68. </p><pre class="programlisting">

  69. SHOW ALL;

  70.             name         | setting |                description                                                          

  71. -------------------------+---------+-------------------------------------------------

  72.  allow_system_table_mods | off     | Allows modifications of the structure of ...

  73.     .

  74.     .

  75.     .

  76.  xmloption               | content | Sets whether XML data in implicit parsing ...

  77.  zero_damaged_pages      | off     | Continues processing past damaged page headers.

  78. (196 rows)

  79. </pre></div><div class="refsect1" id="id-1.9.3.178.9"><h2>Compatibility</h2><p>

  80.    The <code class="command">SHOW</code> command is a

  81.    <span class="productname">PostgreSQL</span> extension.

  82.   </p></div><div class="refsect1" id="id-1.9.3.178.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-set.html" title="SET"><span class="refentrytitle">SET</span></a>, <a class="xref" href="sql-reset.html" title="RESET"><span class="refentrytitle">RESET</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-set-transaction.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-start-transaction.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">SET TRANSACTION </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> START TRANSACTION</td></tr></table></div></body></html>
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