Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.410
diff -u -p -r1.410 system.install
--- modules/system/system.install	20 Oct 2009 19:06:09 -0000	1.410
+++ modules/system/system.install	21 Oct 2009 03:36:42 -0000
@@ -1097,7 +1097,7 @@ function system_schema() {
     ),
     'indexes' => array(
       'fit' => array('fit'),
-      'tab_parent' => array('tab_parent'),
+      'tab_parent' => array(array('tab_parent', 64), 'weight', 'title'),
       'tab_root_weight_title' => array(array('tab_root', 64), 'weight', 'title'),
     ),
     'primary key' => array('path'),
@@ -2853,6 +2853,8 @@ function system_update_7043() {
     'not null' => TRUE,
     'default' => 0,
   ));
+  db_drop_index('menu_router', 'tab_parent');
+  db_add_index('menu_router', 'tab_parent', array(array('tab_parent', 64), 'weight', 'title'));
 }
 
 /**