Index: webform.install
===================================================================
--- webform.install     (revision 651)
+++ webform.install     (working copy)
@@ -99,21 +99,22 @@
         uid integer NOT NULL default '0',
         submitted integer NOT NULL default '0',
         remote_addr varchar(128) NOT NULL default '',
-        PRIMARY KEY (nid,sid),
-        KEY sid (sid)
+        PRIMARY KEY (nid,sid)
         )"
       );
     
+      db_query("CREATE INDEX {webform_submissions}_sid_idx ON {webform_submissions} (sid)");
+
       db_query("CREATE TABLE {webform_submitted_data} (
         nid integer NOT NULL default '0',
         sid integer NOT NULL default '0',
         cid integer NOT NULL default '0',
         no integer NOT NULL default '0',
         data text NOT NULL default '',
-        PRIMARY KEY (nid,sid,cid,no),
-        KEY sid (sid)
+        PRIMARY KEY (nid,sid,cid,no)
         )"
       );
+      db_query("CREATE INDEX {webform_submitted_data}_sid_idx ON {webform_submitted_data} (sid)");
     break;
   }
   
@@ -526,4 +527,4 @@
     }
     @rmdir($path);
   }
-}
\ No newline at end of file
+}