role="catalog_table_entry"><para role="column_definition">
       <structfield>numa_node</structfield> <type>int4</type>
      </para>
      <para>
      ID of <acronym>NUMA</acronym> node
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>size</structfield> <type>int8</type>
      </para>
      <para>
       Size of the allocation on this particular NUMA memory node in bytes
      </para></entry>
     </row>

    </tbody>
   </tgroup>
  </table>

  <para>
   By default, the <structname>pg_shmem_allocations_numa</structname> view can be
   read only by superusers or roles with privileges of the
   <literal>pg_read_all_stats</literal> role.
  </para>
 </sect1>

 <sect1 id="view-pg-stats">
  <title><structname>pg_stats</structname></title>

  <indexterm zone="view-pg-stats">
   <primary>pg_stats</primary>
  </indexterm>

  <para>
   The view <structname>pg_stats</structname> provides access to
   the information stored in the <link
   linkend="catalog-pg-statistic"><structname>pg_statistic</structname></link>
   catalog.  This view allows access only to rows of
   <link linkend="catalog-pg-statistic"><structname>pg_statistic</structname></link> that correspond to tables the
   user has permission to read, and therefore it is safe to allow public
   read access to this view.
  </para>

  <para>
   <structname>pg_stats</structname> is also designed to present the
   information in a more readable format than the underlying catalog
   &mdash; at the cost that its schema must be extended whenever new slot types
   are defined for <link linkend="catalog-pg-statistic"><structname>pg_statistic</structname></link>.
  </para>

  <table>
   <title><structname>pg_stats</structname> Columns</title>
   <tgroup cols="1">
    <thead>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       Column Type
      </para>
      <para>
       Description
      </para></entry>
     </row>
    </thead>

    <tbody>
     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>schemaname</structfield> <type>name</type>
       (references <link linkend="catalog-pg-namespace"><structname>pg_namespace</structname></link>.<structfield>nspname</structfield>)
      </para>
      <para>
       Name of schema containing table
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>tablename</structfield> <type>name</type>
       (references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>relname</structfield>)
      </para>
      <para>
       Name of table
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>attname</structfield> <type>name</type>
       (references <link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.<structfield>attname</structfield>)
      </para>
      <para>
       Name of column described by this row
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>inherited</structfield> <type>bool</type>
      </para>
      <para>
       If true, this row includes values from child tables, not just the
       values in the specified table
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>null_frac</structfield> <type>float4</type>
      </para>
      <para>
       Fraction of column entries that are null
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>avg_width</structfield> <type>int4</type>
      </para>
      <para>
       Average width in bytes of column's entries
      </para></entry>
     </row>