diff --git a/configs/advanced/data_node.yaml b/configs/advanced/data_node.yaml
index 84f403ac23..b2919eb478 100644
--- a/configs/advanced/data_node.yaml
+++ b/configs/advanced/data_node.yaml
@@ -38,5 +38,5 @@ dataNode:
 
   flush:
     # max buffer size to flush
-    insertBufSize: 500
+    insertBufSize: 32000
     ddBufSize: 20