diff --git a/dbpool.go b/dbpool.go
index 7073aca..d30bba5 100644
--- a/dbpool.go
+++ b/dbpool.go
@@ -140,30 +140,53 @@ func (this *dbPool) LoopLoad(
 	watchTimeCb func() int64,
 	sqlCb func(int64) string,
 	params []string,
-	nextTimeCb func() time.Duration,
-	nextRoundCb func() time.Duration,
+	nextTimeCb func() int64,
+	nextRoundCb func() int64,
 	doCb func(*DataSet) bool) {
-	{
-		go func () {
+	newDataCond := sync.NewCond(new(sync.Mutex))
+	chTimer := make(chan int64)
+
+	go func () {
+		var lastMaxIdx int64
+		for true {
+			hasNewDdata := false
 			this.RawQuery(
 				dataSource,
-				fmt.Sprintf("SELECT MAX(idx) FROM %s", watchTable),
+				fmt.Sprintf("SELECT MAX(idx) AS max_idx FROM %s", watchTable),
 				[]string{},
 				func (err error, ds *DataSet) {
+					if err != nil {
+						return
+					}
+					if ds.Next() {
+						idx := q5.ToInt64(ds.GetByName("max_idx"))
+						if idx > lastMaxIdx {
+							lastMaxIdx = idx
+							hasNewDdata = true
+						}
+					}
 				})
-			time.Sleep(time.Second * 3)
-		}()
-	}
-	var lastIdx int64
-	for true {
-		hasNextData := false
-		sql := sqlCb(lastIdx)
-		this.RawQuery(
-			dataSource,
-			sql,
-			params,
-			func (err error, ds *DataSet) {
-				if err == nil {
+			if hasNewDdata {
+				newDataCond.Broadcast()
+			} else {
+				time.Sleep(time.Second * time.Duration(watchTimeCb()))
+			}
+		}
+	}()
+
+	{
+		var lastIdx int64
+		for true {
+			hasNextData := false
+			sql := sqlCb(lastIdx)
+			this.RawQuery(
+				dataSource,
+				sql,
+				params,
+				func (err error, ds *DataSet) {
+					if err != nil {
+						return
+					}
 					for ds.Next() {
 						idx := q5.ToInt64(ds.GetByName("idx"))
 						if !doCb(ds) {
@@ -174,13 +197,16 @@ func (this *dbPool) LoopLoad(
 						}
 						hasNextData = true
 					}
-				}
-			})
-		if hasNextData {
-			time.Sleep(nextTimeCb())
-		} else {
-			lastIdx = 0
-			time.Sleep(nextRoundCb())
+				})
+			if hasNextData {
+				chTimer <- nextTimeCb()
+			} else {
+				lastIdx = 0
+				chTimer <- nextRoundCb()
+			}
+			newDataCond.L.Lock()
+			newDataCond.Wait()
+			newDataCond.L.Unlock()
 		}
 	}
 }