Index: includes/cache.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/cache.inc,v
retrieving revision 1.17.2.3
diff -u -r1.17.2.3 cache.inc
--- includes/cache.inc	10 Aug 2009 10:43:55 -0000	1.17.2.3
+++ includes/cache.inc	25 Nov 2009 22:39:40 -0000
@@ -169,7 +169,7 @@
   else {
     if ($wildcard) {
       if ($cid == '*') {
-        db_query("DELETE FROM {". $table ."}");
+        db_query("TRUNCATE TABLE {". $table ."}");
       }
       else {
         db_query("DELETE FROM {". $table ."} WHERE cid LIKE '%s%%'", $cid);
Index: modules/update/update.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/update/update.module,v
retrieving revision 1.17.2.5
diff -u -r1.17.2.5 update.module
--- modules/update/update.module	9 Jun 2009 11:08:32 -0000	1.17.2.5
+++ modules/update/update.module	25 Nov 2009 22:39:40 -0000
@@ -557,7 +557,7 @@
   }
 }
 
-/** 
+/**
  * Retrieve data from the private update status cache table.
  *
  * @param $cid
@@ -585,7 +585,7 @@
  */
 function _update_cache_clear($cid = NULL) {
   if (empty($cid)) {
-    db_query("DELETE FROM {cache_update}");
+    db_query("TRUNCATE TABLE {cache_update}");
   }
   else {
     db_query("DELETE FROM {cache_update} WHERE cid = '%s'", $cid);