Index: database/database.4.0.mysql
===================================================================
RCS file: /cvs/drupal/drupal/database/Attic/database.4.0.mysql,v
retrieving revision 1.1.2.1
diff -u -F^f -r1.1.2.1 database.4.0.mysql
--- database/database.4.0.mysql	23 May 2006 18:45:47 -0000	1.1.2.1
+++ database/database.4.0.mysql	23 Nov 2006 19:26:22 -0000
@@ -816,7 +816,8 @@
   referer varchar(128) NOT NULL default '',
   hostname varchar(128) NOT NULL default '',
   timestamp int(11) NOT NULL default '0',
-  PRIMARY KEY (wid)
+  PRIMARY KEY (wid),
+  KEY (type)
 );
 
 --
Index: database/database.4.1.mysql
===================================================================
RCS file: /cvs/drupal/drupal/database/Attic/database.4.1.mysql,v
retrieving revision 1.1.2.1
diff -u -F^f -r1.1.2.1 database.4.1.mysql
--- database/database.4.1.mysql	23 May 2006 18:45:47 -0000	1.1.2.1
+++ database/database.4.1.mysql	23 Nov 2006 19:26:22 -0000
@@ -872,7 +872,8 @@
   referer varchar(128) NOT NULL default '',
   hostname varchar(128) NOT NULL default '',
   timestamp int(11) NOT NULL default '0',
-  PRIMARY KEY (wid)
+  PRIMARY KEY (wid),
+  KEY (type)
 )
 DEFAULT CHARACTER SET utf8;
 
Index: database/database.pgsql
===================================================================
RCS file: /cvs/drupal/drupal/database/Attic/database.pgsql,v
retrieving revision 1.173.2.2
diff -u -F^f -r1.173.2.2 database.pgsql
--- database/database.pgsql	23 May 2006 18:53:11 -0000	1.173.2.2
+++ database/database.pgsql	23 Nov 2006 19:26:23 -0000
@@ -824,6 +824,8 @@
   PRIMARY KEY (wid)
 );
 
+CREATE INDEX {watchdog}_type_idx ON {watchdog} (type);
+
 --
 -- Insert some default values
 --
Index: database/updates.inc
===================================================================
RCS file: /cvs/drupal/drupal/database/Attic/updates.inc,v
retrieving revision 1.224.2.6
diff -u -F^f -r1.224.2.6 updates.inc
--- database/updates.inc	8 Jun 2006 21:25:50 -0000	1.224.2.6
+++ database/updates.inc	23 Nov 2006 19:26:24 -0000
@@ -2013,3 +2013,20 @@ function system_update_182() {
 
   return $ret;
 }
+
+// Ad 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;
+}