Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.301
diff -u -p -r1.301 system.install
--- modules/system/system.install	21 Jan 2009 16:58:42 -0000	1.301
+++ modules/system/system.install	23 Jan 2009 17:54:57 -0000
@@ -1260,7 +1260,7 @@ function system_schema() {
     ),
     'primary key' => array('pid'),
     'indexes' => array(
-      'src' => array('src'),
+      'src_language' => array('src', 'language'),
     ),
   );
 
@@ -2688,6 +2688,15 @@ function system_update_6047() {
 }
 
 /**
+ * Replace src index on the {url_alias} table with src, language.
+ */
+function system_update_6048() {
+  $ret = array();
+  db_add_index($ret, 'url_alias', 'src_language', array('src', 'language'));
+  db_drop_index($ret, 'url_alias', 'src');
+}
+
+/**
  * @} End of "defgroup updates-5.x-to-6.x"
  * The next series of updates should start at 7000.
  */