diff --git a/dbpool.go b/dbpool.go
index e57c5c7..26113d1 100644
--- a/dbpool.go
+++ b/dbpool.go
@@ -130,11 +130,23 @@ func (this *dbPool) SyncBatchLoadFullTable(dataSource string, sqlTpl string,
 
 func (this *dbPool) LoopLoad(
 	dataSource string,
+	watchTable string,
+	watchTimeCb func() int64,
 	sqlCb func(int64) string,
 	params []string,
 	nextTimeCb func() time.Duration,
 	nextRoundCb func() time.Duration,
 	doCb func(*DataSet) bool) {
+	{
+		go func () {
+			this.RawQuery(
+				dataSource,
+				fmt.Sprintf("SELECT MAX(idx) FROM %s", watchTable),
+				params,
+				func (err error, ds *DataSet) {
+				})
+		}()
+	}
 	var lastIdx int64
 	for true {
 		hasNextData := false