Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.42
diff -u -F^f -r1.42 system.install
--- modules/system/system.install	22 Nov 2006 09:16:48 -0000	1.42
+++ modules/system/system.install	23 Nov 2006 18:18:41 -0000
@@ -541,7 +541,8 @@ function system_install() {
         referer varchar(128) NOT NULL default '',
         hostname varchar(128) NOT NULL default '',
         timestamp int NOT NULL default '0',
-        PRIMARY KEY (wid)
+        PRIMARY KEY (wid),
+        KEY (type)
       ) /*!40100 DEFAULT CHARACTER SET UTF8 */ ");
 
       break;
@@ -3068,6 +3069,24 @@ function system_update_182() {
   return $ret;
 }
 
+// Add an index on watchdog:type
+function system_update_183() {
+  $ret = array();
+
+  switch ($GLOBALS['db_type']) {
+    case 'mysql':
+    case 'mysqli':
+      $ret[] = update_sql("ALTER TABLE {watchdog} ADD INDEX (type)");
+      break;
+    case 'pgsql':
+      $ret[] = update_sql('CREATE INDEX {watchdog}_type_idx ON {watchdog}(type)');
+      break;
+  }
+
+  return $ret;
+}
+
+
 /**
  * @defgroup updates-4.7-to-5.0 System updates from 4.7 to 5.0
  * @{