diff --git a/workflow/engine/data/mysql/schema.sql b/workflow/engine/data/mysql/schema.sql
index 98dfea81d..14112ae43 100644
--- a/workflow/engine/data/mysql/schema.sql
+++ b/workflow/engine/data/mysql/schema.sql
@@ -151,7 +151,8 @@ DROP TABLE IF EXISTS `APP_MESSAGE`;
 
 CREATE TABLE `APP_MESSAGE`
 (
-	`APP_MSG_UID` VARCHAR(32)  NOT NULL,
+	`APP_MSG_ID` INTEGER  NOT NULL AUTO_INCREMENT,
+    `APP_MSG_UID` VARCHAR(32)  NOT NULL,
 	`MSG_UID` VARCHAR(32),
 	`APP_UID` VARCHAR(32) default '' NOT NULL,
 	`DEL_INDEX` INTEGER default 0 NOT NULL,
@@ -175,14 +176,16 @@ CREATE TABLE `APP_MESSAGE`
 	`TAS_ID` INTEGER default 0,
 	`APP_NUMBER` INTEGER default 0,
 	PRIMARY KEY (`APP_MSG_UID`),
+    UNIQUE KEY `indexAppMsgId` (`APP_MSG_ID`),
 	KEY `indexForAppUid`(`APP_UID`),
 	KEY `indexForMsgStatus`(`APP_MSG_STATUS`),
 	KEY `INDEX_PRO_ID`(`PRO_ID`),
 	KEY `INDEX_TAS_ID`(`TAS_ID`),
 	KEY `INDEX_APP_NUMBER`(`APP_NUMBER`),
-	KEY `INDEX_APP_MSG_TYPE_ID`(`APP_MSG_STATUS_ID`),
+	KEY `INDEX_APP_MSG_TYPE_ID`(`APP_MSG_TYPE_ID`),
 	KEY `INDEX_APP_MSG_STATUS_ID`(`APP_MSG_STATUS_ID`),
-	KEY `indexAppUidSendDate`(`APP_UID`, `APP_MSG_SEND_DATE`)
+	KEY `indexAppUidSendDate`(`APP_UID`, `APP_MSG_SEND_DATE`),
+    KEY `indexAppMsgDate`(`APP_MSG_DATE`)
 )ENGINE=InnoDB  DEFAULT CHARSET='utf8' COMMENT='Messages in an Application';
 #-----------------------------------------------------------------------------
 #-- APP_OWNER