Update hash warning in manual.

doc/src/sgml/indices.sgml

-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/indices.sgml,v 1.32 2002/06/21 03:25:53 momjian Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/indices.sgml,v 1.33 2002/06/21 16:52:00 momjian Exp $ -->
 
 <chapter id="indexes">
  <title id="indexes-title">Indexes</title>
@@ -181,9 +181,10 @@ CREATE INDEX <replaceable>name</replaceable> ON <replaceable>table</replaceable>
 </synopsis>
    <note>
     <para>
-     Testing has shown that hash indexes are slower than btree indexes,
-     and the size and build time for hash indexes is much worse. For
-     these reasons, hash index use is discouraged.
+     Testing has shown hash indexes to be similar or slower than btree
+     indexes, and the index size and build time for hash indexes is much
+     worse. Hash indexes also suffer poor performance under high
+     concurrency. For these reasons, hash index use is discouraged.
     </para>
    </note>  
   </para>

doc/src/sgml/ref/create_index.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_index.sgml,v 1.32 2002/06/21 03:25:53 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_index.sgml,v 1.33 2002/06/21 16:52:00 momjian Exp $
 PostgreSQL documentation
 -->
 
@@ -330,9 +330,10 @@ ERROR: Cannot create index: 'index_name' already exists.
     the <literal>=</literal> operator.
    </para>
    <para>
-     Testing has shown that hash indexes are slower than btree indexes,
-     and the size and build time for hash indexes is much worse. For
-     these reasons, hash index use is discouraged.
+     Testing has shown hash indexes to be similar or slower than btree
+     indexes, and the index size and build time for hash indexes is much
+     worse. Hash indexes also suffer poor performance under high
+     concurrency. For these reasons, hash index use is discouraged.
    </para>
 
    <para>