Add comments about VACUUM to free space map docs.

Joshua D. Drake

doc/src/sgml/config.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.156 2007/11/19 02:26:10 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.157 2007/11/28 05:01:24 momjian Exp $ -->
 
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -962,7 +962,16 @@ SET ENABLE_SEQSCAN TO OFF;
      </varlistentry>
 
      </variablelist>
+
+     <note>
+      <para>
+       See the <xref linkend="sql-vacuum" endterm="sql-vacuum-title">
+       command for information on setting this parameter.
+      </para>
+     </note>
+
      </sect2>
+
      <sect2 id="runtime-config-resource-kernel">
      <title>Kernel Resource Usage</title>
      <variablelist>

doc/src/sgml/ref/vacuum.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.49 2007/10/07 01:16:42 alvherre Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.50 2007/11/28 05:01:24 momjian Exp $
 PostgreSQL documentation
 -->
 
@@ -96,7 +96,10 @@ VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">
     <term><literal>VERBOSE</literal></term>
     <listitem>
      <para>
-      Prints a detailed vacuum activity report for each table.
+      Prints a detailed vacuum activity report for each table. Can be used
+      to help determine appropriate settings for
+      <literal>max_fsm_pages</literal>, <literal>max_fsm_pages</literal>,
+      and <literal>default_statistics_target</literal>.
      </para>
     </listitem>
    </varlistentry>