diff --git a/workflow/engine/config/schema.xml b/workflow/engine/config/schema.xml
index bf73a609d..184b6da82 100644
--- a/workflow/engine/config/schema.xml
+++ b/workflow/engine/config/schema.xml
@@ -337,6 +337,9 @@
     <column name="APP_MSG_SEND_DATE" type="TIMESTAMP" required="true"/>
     <column name="APP_MSG_SHOW_MESSAGE" type="TINYINT" required="true" default="1"/>
     <column name="APP_MSG_ERROR" type="LONGVARCHAR" required="false"/>
+    <index name="indexForAppUid">
+      <index-column name="APP_UID"/>
+    </index>
   </table>
   <table name="APP_OWNER">
     <vendor type="mysql">
diff --git a/workflow/engine/data/mysql/schema.sql b/workflow/engine/data/mysql/schema.sql
index adff561d6..e01e78dce 100644
--- a/workflow/engine/data/mysql/schema.sql
+++ b/workflow/engine/data/mysql/schema.sql
@@ -161,7 +161,8 @@ CREATE TABLE `APP_MESSAGE`
 	`APP_MSG_SEND_DATE` DATETIME  NOT NULL,
 	`APP_MSG_SHOW_MESSAGE` TINYINT default 1 NOT NULL,
 	`APP_MSG_ERROR` MEDIUMTEXT,
-	PRIMARY KEY (`APP_MSG_UID`)
+	PRIMARY KEY (`APP_MSG_UID`),
+	KEY `indexForAppUid`(`APP_UID`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='Messages in an Application';
 #-----------------------------------------------------------------------------
 #-- APP_OWNER