Index: includes/database.mysql.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/database.mysql.inc,v
retrieving revision 1.66.2.2
diff -u -p -r1.66.2.2 database.mysql.inc
--- includes/database.mysql.inc	19 Oct 2007 21:49:26 -0000	1.66.2.2
+++ includes/database.mysql.inc	22 Apr 2008 09:46:21 -0000
@@ -358,7 +358,7 @@ function db_query_temporary($query) {
   $tablename = array_pop($args);
   array_shift($args);
 
-  $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE '. $tablename .' SELECT', db_prefix_tables($query));
+  $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE '. $tablename .' Engine=HEAP SELECT', db_prefix_tables($query));
   if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
     $args = $args[0];
   }
Index: includes/database.mysqli.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/database.mysqli.inc,v
retrieving revision 1.32.2.2
diff -u -p -r1.32.2.2 database.mysqli.inc
--- includes/database.mysqli.inc	11 Feb 2008 05:50:28 -0000	1.32.2.2
+++ includes/database.mysqli.inc	22 Apr 2008 09:46:21 -0000
@@ -338,7 +338,7 @@ function db_query_temporary($query) {
   $tablename = array_pop($args);
   array_shift($args);
 
-  $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE '. $tablename .' SELECT', db_prefix_tables($query));
+  $query = preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE '. $tablename .' Engine=HEAP SELECT', db_prefix_tables($query));
   if (isset($args[0]) and is_array($args[0])) { // 'All arguments in one array' syntax
     $args = $args[0];
   }