diff --git a/def.go b/def.go
index fa0986f..cc0e950 100644
--- a/def.go
+++ b/def.go
@@ -221,7 +221,7 @@ const (
 	TGCmdQueueSize          = 100
 	MQTGCmdWorkers          = 3
 	MQTGCmdQueueSize        = 100
-	SQLJobSliceSize         = 250
+	SQLJobSliceSize         = 15
 )
 
 var (