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<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!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>51.51. pg_statistic_ext</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="catalog-pg-statistic.html" title="51.50. pg_statistic" /><link rel="next" href="catalog-pg-statistic-ext-data.html" title="51.52. pg_statistic_ext_data" /></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">51.51. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_statistic_ext</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-statistic.html" title="51.50. pg_statistic">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 51. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.0 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-statistic-ext-data.html" title="51.52. pg_statistic_ext_data">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="CATALOG-PG-STATISTIC-EXT"><div class="titlepage"><div><div><h2 class="title" style="clear: both">51.51. <code class="structname">pg_statistic_ext</code></h2></div></div></div><a id="id-1.10.4.53.2" class="indexterm"></a><p> The catalog <code class="structname">pg_statistic_ext</code> holds definitions of extended planner statistics. Each row in this catalog corresponds to a <em class="firstterm">statistics object</em> created with <a class="xref" href="sql-createstatistics.html" title="CREATE STATISTICS"><span class="refentrytitle">CREATE STATISTICS</span></a>. </p><div class="table" id="id-1.10.4.53.4"><p class="title"><strong>Table 51.51. <code class="structname">pg_statistic_ext</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_statistic_ext Columns" border="1"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>Name</th><th>Type</th><th>References</th><th>Description</th></tr></thead><tbody><tr><td><code class="structfield">stxrelid</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-class.html" title="51.11. pg_class"><code class="structname">pg_class</code></a>.oid</code></td><td>Table containing the columns described by this object</td></tr><tr><td><code class="structfield">stxname</code></td><td><code class="type">name</code></td><td> </td><td>Name of the statistics object</td></tr><tr><td><code class="structfield">stxnamespace</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-namespace.html" title="51.32. pg_namespace"><code class="structname">pg_namespace</code></a>.oid</code></td><td> The OID of the namespace that contains this statistics object </td></tr><tr><td><code class="structfield">stxowner</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-authid.html" title="51.8. pg_authid"><code class="structname">pg_authid</code></a>.oid</code></td><td>Owner of the statistics object</td></tr><tr><td><code class="structfield">stxkeys</code></td><td><code class="type">int2vector</code></td><td><code class="literal"><a class="link" href="catalog-pg-attribute.html" title="51.7. pg_attribute"><code class="structname">pg_attribute</code></a>.attnum</code></td><td> An array of attribute numbers, indicating which table columns are covered by this statistics object; for example a value of <code class="literal">1 3</code> would mean that the first and the third table columns are covered </td></tr><tr><td><code class="structfield">stxkind</code></td><td><code class="type">char[]</code></td><td> </td><td> An array containing codes for the enabled statistic kinds; valid values are: <code class="literal">d</code> for n-distinct statistics, <code class="literal">f</code> for functional dependency statistics, and <code class="literal">m</code> for most common values (MCV) list statistics </td></tr></tbody></table></div></div><br class="table-break" /><p> The <code class="structfield">stxkind</code> field is filled at creation of the statistics object, indicating which statistic type(s) are desired. The statistics (once computed by <code class="command">ANALYZE</code>) are stored in <a class="link" href="catalog-pg-statistic-ext-data.html" title="51.52. pg_statistic_ext_data"><code class="structname">pg_statistic_ext_data</code></a> catalog. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-statistic.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-statistic-ext-data.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">51.50. <code class="structname">pg_statistic</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 51.52. <code class="structname">pg_statistic_ext_data</code></td></tr></table></div></body></html>