diff --git a/workflow/engine/config/schema.xml b/workflow/engine/config/schema.xml
index e0b6ce986..396c9abd5 100755
--- a/workflow/engine/config/schema.xml
+++ b/workflow/engine/config/schema.xml
@@ -1547,6 +1547,9 @@
         <parameter name="Comment" value=""/>
       </vendor>
     </index>
+    <index name="indexAppUid">
+      <index-column name="APP_UID"/>
+    </index>
   </table>
   <table name="PROCESS_USER">
     <vendor type="mysql">
diff --git a/workflow/engine/data/mysql/schema.sql b/workflow/engine/data/mysql/schema.sql
index bfe35e306..eeb0d50cf 100755
--- a/workflow/engine/data/mysql/schema.sql
+++ b/workflow/engine/data/mysql/schema.sql
@@ -728,7 +728,8 @@ CREATE TABLE `APP_DELAY`
 	`APP_DISABLE_ACTION_DATE` DATETIME,
 	`APP_AUTOMATIC_DISABLED_DATE` DATETIME,
 	PRIMARY KEY (`APP_DELAY_UID`),
-	KEY `indexAppDelay`(`PRO_UID`, `APP_UID`, `APP_THREAD_INDEX`, `APP_DEL_INDEX`, `APP_NEXT_TASK`, `APP_DELEGATION_USER`, `APP_DISABLE_ACTION_USER`)
+	KEY `indexAppDelay`(`PRO_UID`, `APP_UID`, `APP_THREAD_INDEX`, `APP_DEL_INDEX`, `APP_NEXT_TASK`, `APP_DELEGATION_USER`, `APP_DISABLE_ACTION_USER`),
+    KEY `indexAppUid`(`APP_UID`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='APP_DELAY';
 #-----------------------------------------------------------------------------
 #-- PROCESS_USER